ABSTRACT
This study focused on the application of kolestran drug as corrosion inhibitor of aluminium in H2SO4 medium. Chemical compositions the inhibitor was identified using gas chromatography mass spectrophotometer (GCMS). Gravimetric technique was used for the corrosion control study. On response surface methodology (RSM), central composite design tool of design expert software version 12 was employed in the optimization of kolestran’s inhibition efficiency. Analyses of the results revealed that kolestran drug contains benzaldehyde, methylmonoacetal, trans-13-octadecanoic acid and methyl ester. Presence of these heterocyclic compounds is an indication that kolestran drug possesses suitable inhibitive properties. The results indicate that corrosion rate decreased with increase in inhibitor concentration and time but increased with increase in temperature. Inversely, inhibition efficiency increased with increase in inhibitor concentration and time, but decreased with increase in temperature. A quadratic model adequately described the relationship between inhibition efficiency and corrosion control variables of inhibitor concentration, temperature and time. The model was screened with various statistical measures, which include correlation coefficient (R2), p-value (<0.0001) and adequate precision. The gravimetric results showed that kolestran is effective corrosion inhibitor of Al in H2SO4 medium.
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