Comparative assessment and statistical data of admixed rosemary and castor oil on the corrosion inhibition of high carbon and P4 low carbon mold steels
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Elsevier
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Admixed rosemary and castor oil extracts (RSCO) were studied for their corrosion inhibition properties
on high carbon steel (HCS) and P4 low carbon mold steel (P4S) in 1 M H2SO4 and HCl solution by coupon
measurement. Results obtained showed that the admixed oil extract performed effectively on HCS and
P4S with mean inhibition efficiency values above 90% for P4S and 80% for HCS in both acid solutions.
The inhibition efficiency values of RSCO on P4S and HCS varied only with exposure time in H2SO4 with
progressive increase in value compared to the effect of RSCO concentration which was negligible. The corresponding
effect of RSCO in HCl solution showed no effect of exposure time and RSCO concentration on
its performance on P4S while on HCS the effect of exposure time was observed. The standard deviation
values obtained for RSCO inhibition efficiency at all concentrations on P4S and HCS in H2SO4, and HCS in
HCl shows the degree of variation from mean values to be significant compared to the values obtained for
P4S in HCl solution which were relatively small. The proportion of inhibition efficiency values above 70%
inhibition performance are 39%, 44%, 100% and 39% at margin of error of 13%, 13.5%, 0% and 13% for P4S
and HCS in H2SO4 and HCl solution. Analysis of variance shows exposure time is the dominant statistically
relevant source of variation influencing RSCO inhibition performance in H2SO4 and HCl solutions.
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Keywords
TJ Mechanical engineering and machinery