Gravimetric study and statistical data on the symbiotic effect of organic intermixtures on corrosion inhibition of P4 mold steel
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The corrosion protection properties of the intermixed of l-leucine and vanillin
(LLVL) on P4 mold steel within 1.5 M H2SO4 and HCl media was studied by weight loss
analysis. Calculated data revealed the inhibition effect of the intermixed compound performed
poorly at low H2SO4 concentrations due to inability of the combined inhibitor molecules to
aggregate and effectively hinder the dispersion of the destructive anions to the steel surface.
The inhibition efficiency decreased significantly with time to values below effective inhibitor
performance. However, from mid to optimum concentration, inhibition efficiency of the
compound was generally stable with time with values generally above 85%. In HCl media, the
inhibition efficiency of the intermixture was generally above 80% at all concentrations with
respect to the inspection time. The inhibitor compound exhibited greater stability in HCl
compared to H2SO4 solution. Calculated values of standard deviation in H2SO4 were broadly
greater than the outputs received in HCl due to the degree of variation between LLVL
inhibition efficiency values. The margin of error at 95% confidence shows 65% of LLVL
inhibition efficiency values obtained in H2SO4 solution have values above 70% inhibition
efficiency with margin of error at +12.07% while in HCl solution, 100% of the LLVL
inhibition efficiency data obtained is above 70% with margin of error of +1%. Analysis of
variance showed the statistical relevance of inhibition efficiency in H2SO4 and HCl solution is
significantly higher the corresponding relevance for inspection time with values of 70.45% and
71.18%.
Keywords
TJ Mechanical engineering and machinery, TP Chemical technology