Department of Mining Engineering

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CHARACTERIZATIONS OF SOME NIGERIAN BED MATERIALS FOR FLUIDIZED BED COMBUSTOR
(2009) I. I. Ozigis; Abdulraman Sikiru Ottan
Bed materials processing involves solid minerals reduction to sizes of about 100-600pm and density of about 1400-3000 kg/m". Apart from the physical criteria, the chemical properties were also essential in respect of its absorbent and agglomeration effects in the fluidized bed combustor. In this work, we present the process technology to produce and select bed materials from Nigerian solid minerals. Firstly, the chemical composition of the various processed bed materials were determined using wet chemical method. Secondly, we subjected the materials at 100um to dustiness test which provided the proportion trapped by the cyclone and filter. Nigerian bed materials were high in qualities and they met the requirements of fluidized bed combustion technology.
Investigation of Some Physical and Strength Properties of Clay and Weathered Bedrock for Production of Hydra Form Bricks
(2010) S. O. Abdulrahaman; B.M. Olaleye; M. A. Saliu
Clay and weathered bedrock samples at Ilorin, Kwara State, Nigeria have been investigated; as alternative earth materials for the production of hydraform bricks. Varying mixes of clay and weathered bedrock samples were evaluated and their physical and chemical properties determined. The compressive strength of the bricks made from different mixes were determined using Hydraform Block Tester. The result of the investigation showed that a 50:50 mix ratio of clay and weathered bedrock samples gave hydraform bricks of highest strength averaging 4.4 MPa which makes it better and stronger hydraform blocks than the ones produced from laterite which is 2.90 MPa. The mix ratio also has a medium absorption rate of 6.25% which falls within ASTM standard and which is quite adequate for construction works applications.
Determination of an Appropriate Exploitation Method for Sobi and Oloje Clay Deposits for Production of Bricks and Ceramic Work; Ilorin, Nigeria
(2012) Abdulraman S. O; Olaleye, B.M
Current exploitation practice of llorin clay deposits in Nigeria has been investigated to be largely dominated by female artisans (old and young) who depend solely on crude implements such as sticks, spades and baskets with resultant premature abandonment of mined out pits. Exploratory pits were dug to probe the profile of the deposits in the two locations (Sobi and Oloje) and the borehole data of the deposits were used to produce isopach map of the deposits. Several equipment combinations were considered for the exploitation of the deposits. Stripping by bulldozer was favoured to be most appropriate.
Flame Jet Burner Application and Performance characteristics in Cutting Miya Granite for Dimension Stone
(2014) Idris Ibrahim Ozigis; Abdulrahman S. Ottan
This work examines the application and performance characteristics of FA300A flame jet burner in cutting Miya granite for dimension stone. The application procedures involves preparation to start flame jet cutting by removal of overburden, boulders and other impurities using bulldozer, payloader and compressed air, respectively. Furthermore, ignition of the flame jet burner involves combustion of diesel gas at appropriate time using acetylene gas and oxygen as well as compressed air. The flame jet cutting operation utilized continuous heating of rock to its spallation until flakes are formed from the surface of granite kerf. Performance test of flame jet burner in cutting Miya granite for dimension stone were conducted with reference to actual cutting speed, heat release rate, penetration rate and productivity. The heat input of the flame jet burner was determined to be 483.1 kW resulting in heat release rate per unit internal cross sectional area of the burner as 680,433.5 kW/m2 while heat release rate per unit volume of flame jet burner was 1, 134, 038 kW/m3. The penetration rate of 0.4 mm/s was obtained when FA300A flame jet burner was applied to cut Miya granite for dimension stone. The flame jet burner had cutting speed of 1.65 m2/hr and productivity of 16.6 kg/m2.s in cutting Miya granite for dimension stone. Also highlighted were operating parameters of the flame jet burner that must be kept in mind for its improved adaptation in Nigerian mineral extractive industry.
Equipment Maintenance Management Audit of Some Granite Aggregate Quarries in Part of South - West Nigeria.
(2016) Abdulraman S. O.; Olaleye B.M; Saliu M.A
This paper analyses an existing maintenance management system in some selected typical granite aggregate quarries (represented as K1, K2 and K3) in part of South-west Nigeria using modified questionnaire and interview. The quarries' current maintenance management effectiveness was evaluated with respect to five basic elements of maintenance management. The quarries were rated in accordance with global best practices with credits/ points ranging from 1 to 3. Investigation shows that K1 and K2 had average overall ratings of 1.45 and 1.39 respectively. These scores fell below average performance, which informed their inability to operate at profit and call for urgent improvement decisions in all elements of maintenance management benchmarked. K3 scored 2.48, which indicates that the quarry adopts an effective maintenance management system, but will also need to improve on its preventive maintenance and maintenance scheduling. This paper is therefore an assessment initiative for maintenance and productivity continuous improvement and can be integrated as apart of a decision support system for maintenance management in the quarry industry.
Prioritisation of Maintenance Policies for Upstream Equipment in A Typical Quarry Using Decision Maintenance Grid (DMG)
(2016) Abdulraman S. O; Olaleye B. M; Saliu M. A
This paper provides a framework for equipment maintenance management with options that allow decision makers to select the most successful ways to manage maintenance. Keeping diverse range of equipment working efficiently, managing downtime and achieving output targets in quarries can be something of a juggling act for quarry operators/ managers. The paper also provides an overview of maintenance strategies suitable for upstream equipment in Construction Products Nigeria (CPN) quarry. It considered their respective applications based on operation and failure data of equipment evaluated from the quarry report system (QRS). A decision maintenance grid (DMG) was employed to decide the most appropriate maintenance strategy for the equipment based on their availability values and failure frequencies. It was found out that forward planning is critical to prevent unscheduled downtime and setting up an effective preventive maintenance schedule should be an essential part of the quarry upstream equipment management process.
Important Technical Considerations in the Development of Bankable Documents for Quarry Operations
(2017) S. O. Abdulraman
Today's quarry operations are characterised by high capital expenditure, low product priceand high operating costs including energy costs (diesel cost). Consequently, when deciding on quarry investment, there is little room for inefficiency in quarry design and production scheduling and consequently, in the estimates of the quarry project's value. A doubtful and badly implemented quarry evaluation process could wrongly classify a non-profitable venture as being profitable with appreciable probability, and vice versa. And the consequence of a badly implemented quarry investment evaluation process has economic implications to both the promoters and stake holders of the project with financial institution (BOI') inclusive. Many quarries financed by Nigerian banks record poor performances due to the technical flaws inherent in the So-called Bankable Feasibility study reports submitted during the loan Application process. This paper suggests the need to engage competent hands (Mining Engineers /Mining Consultants) to carry out technical due diligence on every mining project funding or loan applications to guarantee effective and efficient funding of mining projects and justify BOl’s contribution to nation's minerals industry. Also, engage team of engineers to monitor the performance of the quarry throughout the loan period. So as to ensure that the quarry run optimally to guarantee quick pay back and return on investment.
Evaluation of Remedial Option's Efectiveness of Lead Contaminated Site in Bagega Community, Zamfara State , Nigeria
(2017) Alaba O. C.; Abdulraman S. O
The study evaluates the remedial option's effectiveness of lead contaminated site in Bagega community, Zamfara state. Samples of soil and water were collected from residential compounds (BRC), residential garden (BRG), village common area (BVC), processing areas (BPA), farmland areas (BFA), wells (BWE), boreholes (BBH) and ponds (BPO)water at the same locations before and after remediation using standard procedures of ASTM D6907 and APHA respectively. The concentrations of lead metal in soil and water samples before and after remediation were determined using Atomic Absorption Spectrophotometer (AAS) in accordance with ASTM D 3559 and ASTM D1976 standard methods. The results revealed that soil samples recorded the highest lead concentration reduction of 96.1% in BRG while the least lead concentration reduction of 51.7% was recorded in BFA after remediation. Water samples recorded least lead concentration reduction of 21.0 % in BBH and highest lead concentration reduction of 70.8% in BPO after remediation. On the health risk analyses, BPA/01, 07 and 11; BFA/04, 07 and 08 posed health risk to the people while BPO/02, 06 and 09 posed no health risk to the people after remediation. The study therefore concluded that remediation was completely effective at BRC, BRG and BVC but it was not completely effective at BPA and BFA.
Strategic Equipment Maintenance Management in A Medium Scale Quarry, Ogun State, Nigeria.
(2017) S. O.Abdulraman; B.M. Olaleye
Poor performance of granite aggregate quarries is a big challenge to the mineral industry in Nigeria. It threatens the future prosperity of the industry and granite aggregate supply to meet the ever-increasing demand for infrastructural development projects. One major factor impacting on the reliability of quarries is the maintenance management system of the quarry equipment. This paper presents the present situation on equipment maintenance management system of Geoworld quarry in Ogun State, Nigeria. Maintenance management audit of the quarry was carried out through questionnaires with respect to five basic elements of maintenance management system (resource management, information management, preventive maintenance and equipment technology, planning and scheduling and maintenance support). 'SWOT Clock Strategic Behaviour Model was adapted to suggest a rationalistic typology for the quarry management in considering the quarry's strategic direction on equipment maintenance based on the interaction between the quarry's capabilities and resources from the viewpoint of strengths and weaknesses (SW) and between the opportunities and threats (OT) identified in the quarry's environment. Findings show that improvement strategies adopted will impart positively on the areas of deficiencies of the quarry by moving it from state of survival to growth.
Evaluation of Equipment Maintenance Effectiveness in Selected Typical Granite Quarries in South-West Nigeria
(2018) ABDULRAHMAN, S.O.; OLALEYE, B.M.; SALIU, M.A.
Equipment maintenance performance indices allow quarries to understand the value created by maintenance, in a bid to re- evaluate and revise their maintenance policies and techniques, to justify investment in new trends and techniques for maintenance management. This research has attempted to evaluate and compare three maintenance performance indices I1, I2 and I3 (maintenance index; downtime index; and production index respectively) for the studied quarries computed from their records of operational output and maintenance costs for the period reviewed. The index I1 was determined to be between 10 and 20% as against the global standard of less than 6%; index I2 ranged between 19 and 25% as against the industry norm of less than 1% and index I3 averaged 28.5%, while global standard is between 12 and 14%. These indices are not in conformity with the global best standard, this performance is worrisome and has a negative impact on the viability of the quarry business. It becomes imperative therefore that their maintenance policies be revised and their maintenance strategies overhauled to enhance higher performance that can impact positively on the overall corporate goal of the quarries.
Product Specification: A Critical Factor in Crushing Plant Design for Commercial Aggregate Quarries
(2018) Abdulraman S.O.; Olaleye B.M
Commercial quarries require prompt patronage for a better cash flow that will satisfy the prime objective of their establishment. Fonds and Pricey quarry is a 250T/H capacity quarry in Abuja and one of the many Nigerian quarries facing challenges of poor cash flow due to low sales with huge stockpiles of untradeable products. This unpleasant situation threatens the viability of a quarry business. This paper reviewed the production process and financial situation of F & P quarry with the view to revitalize the business through crushing plant process re-engineering to boost the quarry’s cash flow. Pareto analysis of the product sales was carried out and the complete sand making plant that would be amalgamated with the main crushing plant presented. This study showed that, most crushing plant designs give little or no consideration to crushed products demand and supply gap analysis; and there is a regional difference in the market potential for various quarry products, especially dust and 1/2”materials. A short and long term (models I and II) solutions were herein provided for old quarries facing similar business challenges and an improved crushing plant flow line for newly proposed aggregate quarries in Abuja that will guarantee better cash flow and consequent quick payback.
CRUSHING PLANT PERFORMANCE EVALUATION USING OEE
(2019) Abdulraman S. O; Ozigis I. I
Over the years, economy of scale has been adopted as a panacea to the poor return on investment (ROI) in aggregate quarry establishments. This has forced quarries to increase their capital expenditure (CAPEX) due to acquisition of large capacity equipment that are often very costly. Low commodity (chippings) prices and high energy costs have further compelled quarry operators to adopt cost effective operating strategy. The true cost effectiveness of aggregate quarries lies in their performances and life cycle costs, of which their performances depend on their equipment availability, utilization and efficiency. Quarry equipment availability, utilization and efficiency are therefore very important performance indices that a quarry operator needs to constantly evaluate to work within the threshold, if the quarry business must deliver high ROI or quick payback which ultimately is the prime objective of any business. Overall Equipment Effectiveness (OEE) is a well-known performance metric which combines availability, utilization and efficiency for the evaluation of crushing plant effectiveness in an aggregate quarry. The performance metrics of F and P quarry, Abuja, Nigeria have been determined, and the plant availability (A); utilization (U); efficiency (E); and OEE evaluated to be 77.55%, 65.08%, 33.15%, and 16.62% respectively. The OEE value is far below the global best standard of 85% for manufacturing system, and reflects the influence of plant availability, utilization and efficiency on OEE value. However, there is no literature on the use of OEE for granite crushing plant, though; attempts have been made to use the metric on drilling machines, loading and haulage facilities. This paper presents a procedure for estimating OEE of a crushing plant; explains the cause for poor OEE in Nigerian plants during rainy season; and reason why Nigerian crushing plants should run with generators of adequate power outputs; and not on external power source.
Suitability of cow horn as filler in an epoxy composite
(2019) I.O. Ambali; Y.L. Shuaib-Babata; T.O. Alasi; I.N. Aremu; H.K. Ibrahim; Z.U. Elakhame; S.O. Abdulraman
This study focuses on assessment of cow horn as filler in an epoxy composite. A particle-reinforced composite was developed using horn particles (HP) and epoxy resin with filler of varying percentage weight (5%, 10%, 15%, 20%. 25%, 30%, 35%, 40 %) at particle sizes of 100 and 150 μm. The composites were developed by hand lay-up technique with varying process parameters. The properties of the developed composites were examined through tensile, flexural and impact tests. The results showed that the tensile properties of the polymers reduced with the incorporation of the cow horn as filler. But at higher curing temperature, a better strength was achieved. Meanwhile, the flexural and impact properties of the polymers increased with the incorporation of the fiber in no particular order. The composite materials with particle size of 100 μm with curing temperature of 80oC exhibited higher tensile (37.58 MPa) and impact properties (74 J) than the lower particles. Generally, the cow horn was found to be a good potential filler in the composite if prepared using higher curing temperature as exhibited through its mechanical properties.
CORRELATION OF BLASTING PERFORMANCE WITH LOADING AND CRUSHING TIME TO MINIMIZE ENERGY CONSUMPTION
(2020) Olanrewaju Alaba; S.O. Abdulraman
Blasting performance with loading and crushing time were correlated in order to minimize energy consumption in quarry operation. A measure scaled object was placed within the muck pile of blasted rock fragments. Digital camera was used to take the photograph of the scaled object and the blasted rock fragments before the commencement of loading and crushing operations. The data collected were subjected to fragmentation analysis using split desktop App while the correlation analyses were carried with Microsoft Excel App. The fragmentation and distribution analysis showed that the fine cut off sizes are 8.75 cm, 9.55 cm, 7.58 cm, 8.58 cm and 11.75 cm while their mean size distribution are 35.99 cm, 10.25 cm, 24.86 cm, 16.78 cm and 16.10 cm respectively. The R squared values (R2) obtained during the correlation of digging time with size of fragmentation passes (P50), mean deviation and bucket passes were given as 0.94, 0.39 and 0.63 with p-values of 0.00, 0.34 and 0.82 respectively. Consequently, the R2 values during the correlation of crushing time with P50, mean deviation and range were specified as 0.64, 0.62 and 0.27 with p-values of 0.00, 0.11 and 0.07 respectively. The study therefore established that only the regression equation for P50 is statistically significant while statistically insignificant for mean deviation, range and number of bucket passes.
Mechanical properties of calcium carbonate/eggshell particle filled polypropylene Composites
(2020) Kabiru Mustapha; Rashidat Ayinla; Abdulraman Sikiru Ottan; Tunji Adetayo Owoseni
Calcium carbonate is widely used as a filler material in the production of polymer matrix composites and studies have shown that eggshell contains about 94% calcium carbonate. The effect of calcium carbonate from eggshell particles in polypropylene was studied in this work and the result compared with unreinforced polypropylene. Industrially synthesized calcium carbonate/eggshell particles were used as filler in polypropylene matrix with varying mass fractions from 5 to 20 wt. % at 5 wt. % increment. The produced samples were mechanically characterized for indentation hardness and uniaxial tensile properties using a Rockwell hardness tester and universal mechanical testing machine respectively. These properties were measured at different compositions to determine its compositional dependence. Microstructural analysis of the composites top and fracture surface was also carried out using scanning electron microscope to examine possible failure mode. The results were compared to measure the effect of reinforcement and the replacement criteria for the conventional calcium carbonate. The results obtained showed that calcium carbonate reinforced polypropylene has its highest tensile strength, elastic modulus and modulus of rupture at 5 wt. %, ductility and modulus of resilience at 10 wt. %, and hardness at 15 wt. %. The results also showed that granulated eggshell can provided appreciable improvement in the mechanical properties of polypropylene as obtainable in mineral calcium carbonate reinforced polypropylene.
Comparative analysis of drilling performance of kymera and PDC bits in salt formation
(2020) Alaba O.C.; Abdulraman S. O
The study compares the drilling performance of Kymera and PDC bits in salt formation using River and Delta State Continental Shelf of Nigeria as a case study. The measurement while drilling (MWD) and the logging while drilling (LWD) methods were used to measure the real time well drilling operation. well formation and drilling statistics. The data obtained from the Ogbaimbiri. Ossiomo. Utorogu and Okporhuftu wells have the penetration rate of 6.2 m/hr. 5.9 m/hr. 12.2 m/hr. 6.3 m/hr for Kymera bit and 4.2 m/hr. 3.4 m/hr. 6.8 m/hr. 3.9 m/hr for PDC bit respectively. The pearson correlation coefficient has a value of r = 0.897. n = 4. p<0.05 and r = 0.784. n = 4. p<0.05 for both kymera and PDC bits. The results established a strong and positive correlation between the penetration rate and distance drilled in each bit. It also shows that the higher the penetration rate the more the distance drilled by each bit. The study concluded that the Kymera bit was more efficient as it was able to penetrate the different formations with a lesser time and at a greater penetration rate.
Fostering the Sustainability of Artisanal and Small-Scale Mining (ASM) of Barite in Nasarawa State, Nigeria
(2021) Itohan Otoijamun; Moses Kigozi; Sikiru Ottan Abdulraman; Adelana Rasak Adetunji; Azikiwe Peter Onwualu
The exploration and mining of Nigerian barite are primarily by artisanal and small-scale miners (ASM) whose operations are characterized by poor productivity. As a result, the quantity and quality of barites produced do not satisfy the nation’s oil sector demands and other industries that require the mineral. This situation leads to massive importation of the mineral with negative impact on the country’s drive toward increasing the contribution of solid minerals to the gross domestic product (GDP). This study reviews the existing policies and government interventions on ASM of Nigerian barite; evaluates the operations of ASM through a survey of mines in Nasarawa state, Nigeria; identifies factors that affect sustainability of the sector and proffers solutions to foster sustainability of ASM of barite in the region. The study adopted the 4Is optimization technique (Information gathering, Interpretation, Implication, and Implementation) through personal interactions with the stakeholders at the barite mining sites, and government agencies, regarding policies and interventions specific to ASM of barite. Challenges identified include: weak implementation and enforcement of mining laws; inadequate support from government and development partners; poor access to mining equipment and technology; poor infrastructure (access road, water, electricity); poor pricing of products (marketing challenges); poor remuneration of mine workers; poor mining skills; inadequate formal education; limited awareness on environmental health and safety hazards; fragility and conflict; insufficient information and data on mines and miners; security issues; lack of access to finance; lack of formalization of operations and poor legal framework for operations. The strategies suggested for fostering the sustainability of ASM of barites include: enhanced policy and legislation formulation and implementation, strengthening of institutions, formalization of ASM operations, training of miners, awareness campaign, improvement in environmental and safety of operations, empowerment and support by government and development partners for individual miners and processors and organized groups within the sector (such as Miners Association of Nigeria, Association of Miner and Processors of Barite, AMAPOB). Implementation of these strategies will lead to sustainable operations of the sector and hence improved rural livelihoods, stimulation of entrepreneurship in an environmentally responsible manner, and improvement in the contribution of the mineral sector to the nation’s gross domestic product (GDP), and hence national development.
Provenance and Weathering History of Clays from Share-Tshonga Area, Northern Bida Basin, Nigeria
(2021) Awe, A.; Ojo, O.J.; Adepoju, S.A. ,; Omoyegun, T.D.; Adeoye, M.O.; Abdulraman, S.O.
The claystone member of Enagi Formation exposed around Share-Tshonga, northern Bida Basin, central Nigeria was studied to unravel the provenance, paleoweathering and paleoenvironmental conditions using XRF and ICP-MS. Major oxides show enrichment in SiO (60.27-79.87%), relative to Al O (3.10-27.38 %), Fe O (0.98-22.85%), CaO 2 2 3 2 3 (0.01-0.03%), Na O (0.01-0.03%), K O (0.05-0.84%), MnO (0.01-0.15%), TiO (0.21-2.09%) and P O (0.05-0.84%). 2 2 2 2 5 The high SiO /Al O (2.20 to 22.76) with mean of 8.73 suggests higher detritus input in continental environment. 2 2 3 Certain proxy trace elements such as Cr (64.80ppm), Th (17.42ppm) and Zr (528.80ppm) are enriched in the claystone compared to published PAAS (38.20ppm, 14.62ppm and 210.00ppm respectively) and UCC (31.00ppm, 10.70ppm and 190.00ppm respectively) data but depleted in Cu (7.03ppm), Zn (8.00ppm), Rb (12.05ppm), Sr (38.63ppm) and Ba (132.40ppm) compared to published PAAS (50.00, 85.00, 160.00, 200.00 and 650.00 respectively)ppm and UCC (25.00, 71.00, 112.00, 350.00 and 550.00 respectively)ppm. The LREE (250.15ppm) enrichment relative to HREE (23.49ppm) with (La/Yb) of 9.67 to 11.98, negative Europium (Eu/Eu*) anomaly N (0.54-0.63) and (Ce/Ce*) anomaly (0.83-1.49) suggest felsic provenance. The mean values of Al O /TiO (13.17), 2 3 2 K O/Al O (0.02), LREE/HREE (10.65) coupled with discriminant plots of logK O/Na O versus SiO , TiO versus Zr, 2 2 3 2 2 2 2 La/Th versus Hf support dominant felsic source within passive margin tectonic settings. The ranges and mean ratio values of Cu/Zn, V/Cr and U/Th indicate oxic, semi-humid to humid climatic settings. The values of chemical indices; chemical index of alteration (CIA=96.44-99.13), chemical index of weathering (CIW=98.73-99.89), plagioclase index of alteration (PIA=98.71-99.89) compared with the values of PAAS and UCC supported by various plotting including CIW versus CIA and ICV versus CIA show that the claystone clearly depicted extremely high weathering. Relatively higher mean of index of compositional variability (ICV) values (2.03) compared to PAAS (0.74) and UCC (1.18) also indicate compositional maturity.
IMPACTS OF COVID-19 PANDEMIC ON NIGERIA’S ECONOMY: EFFECTIVE FOUNDRY TECHNOLOGY AS A SUSTAINABLE SOLUTION
(2022) Yusuf Lanre SHUAIB-BABATA, Olanrewaju Yusuf BUSARI; Rasheedat Modupe MAHAMOOD, Salihu Swarnu YARU; Lawal Babatunde ABDULQADIR, Ibrahim Owolabi AMBALI; Kabiru Suleiman AJAO, Sikiru Ottan ABDULRAMAN
This study considered the effect of the Covid-19 pandemic on the economy of Nigeria and investigated the effective application of foundry technology to proffer a sustainable solution to the problem. Domestication of production of motorcycle components, being a significant means of transportation that is required for the development of any society was considered. Aluminium scraps from a waste dump and Belle and Oyun natural moulding sands in Kwara State, Nigeria, which have been previously recommended for non-ferrous casting in previous studies were considered and used for casting of motorcycle/tricycle parts (centre stand and brake pedal) using AFS guidelines. The scraps’ chemical compositions were analysed. Thereafter, some mechanical properties with the microstructure of the aluminium casts and that of commercially obtained imported types were examined using appropriate ASTM standards. Cast aluminium alloy produced using scrap had no casting defects and had some mechanical properties comparable to those available on the markets (imported). Thus, effective usage of naturally available moulding sands in Nigeria for foundry applications would help to proffer sustainable solutions to the nation’s economic problem as a result of the adverse effects of the Covid-19 pandemic.
MODELLING OF CORROSION INHIBITION OF CUCUMBER PLANT EXTRACTS ON AISI 1007 STEEL IN SEA WATER
(2022) Yusuf Lanre SHUAIB-BABATA, Hassan Kobe IBRAHIM; Yusuf Olarenwaju BUSARI, Rasheedat Modupe MAHAMOOD; Sikiru Ottan ABDULRAMAN, Ibrahim Owolabi AMBALI; Babatunde Lawal ABDULQADIR, Ishaaq Na’allah AREMU; Kabiru Sulaiman AJAO, Samuel Omojola EJIKO
Adsorption Models with the application of corrosion experimental data is a very popular mechanism to predict various inhibitive systems. The effective modelling and interpretation of adsorption isotherms reliably determine the level of accuracy of adsorption processes. This study aims to apply the adsorption models and inhibitive mechanism of Cucumber Peel Extract (CPE) and Cucumber Seed Oil (CSO) to corrosion of AISI 1007 steel grade in the saline medium using both the electrochemical (Tafel Polarisation) and non-electrochemical (Weight Loss) techniques. The chemical composition of AISI 1007 and the phytochemical properties of studied extracts were determined. Consideration was given to Langmuir and Dubinin-Radushkevich Isotherm models (D-RIM) to study the inhibitive properties of CPE and CSO on AISI 1007 steel in an aggressive medium. The result of inhibition efficiency from weight loss measurement showed maximum inhibitions of 94.44 % and 95.44 % with 1.0 g/L concentration of CPE and CSO respectively in sea water medium. The result of the studied extract at 25 ℃ in seawater showed that the corrosion current density of AISI 1007 steel decreased and increased in the inhibition efficiency with 87.33% and 94.67% for CPE and CSO respectively. The negative value of ΔGads was greater than 20 kJ/mol and was obtained as a result of electrostatic interaction between the adsorbed inhibitor molecules and the ions/atoms on the metal surface. The studied inhibitors were confirmed to be mixed organic corrosion inhibitors type. The values of E and maximum surface coverage (θmax) for the two measurements are satisfactorily in acceptable agreement as similar to the range of value obtained for inhibition efficiency.

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