Abstract
Statistical optimization was used to optimize corrosion inhibition efficiency of Sapium ellipticum leaf extract as corrosion inhibitor of aluminum in acid medium. Response surface methodology was applied, and the effects of four independent variables; acid concentration, inhibitor concentration, temperature, time, and their expected responses were determined. Central composite design a statistical tool was used to generate a total of 16 individual experimental runs, which was previously design to study the effects of these variables during corrosion process. The uniqueness of the model was scrutinized with various criteria including coefficient of determination (R2 = 0.987), p value (< 0.0001), adequate precision (30.22) and coefficient of variation (5.30). The RSM is well fitted in the model which adequately predicted the optimum inhibition efficiency of 96.73% at optimum inhibitor concentration of 1.5g/L-1, acid concentration 1 M, temperature of 303 K and time of 6 hours. Also the electrochemical concept signifies that Sapium ellipticum acts as a mixed-kind inhibitor. The experimental data obtained is in conformity with other research works.
 
 Bull. Chem. Soc. Ethiop. 2020, 34(1), 175-191.
 DOI: https://dx.doi.org/10.4314/bcse.v34i1.17
Highlights
Hydrochloric acid solutions are generally employed in oil and gas operations for de-scaling, cleaning, elimination of scales and rust in metallurgical and material sections
Based on the indices studied, the results showed that Sapium ellipticum leaf extract can be used as anti-corrosion additive for surface modification of aluminum alloy (AA3003) degradation under service conditions
The following conclusions can be inferred from the study: Sapium ellipticum is a friendly inhibitor for mitgation of aluminum corrosion in 1 M HCl
Summary
Hydrochloric acid solutions are generally employed in oil and gas operations for de-scaling, cleaning, elimination of scales and rust in metallurgical and material sections. During these operations, aluminum surfaces are severely influenced by corrosion phenomenon to varying degrees [1,2,3]. To mitigate the effect and prolong the life span of metallic materials, corrosion scientists introduce inhibitors to the corrosive environment during these industrial processes. The use of corrosion inhibitor is the most convenient, simple and possible method to protect metallic materials in corrosive environments. Inhibition phenomenon depends on the composition of the synthesized inhibitor, nature of corrosive ecosystem and coarseness of the metal
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