Comparative Evaluation of the Protection Performance of Admixed Tea Tree and Grapefruit Essential Oil Extracts on Mild Steel and Alloy Steel 3310
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Trans Tech Publications
Abstract
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Analysis and description of inhibition efficiency results for tea tree and grapefruit essential oil
extracts (TTGP) on mild steel (MS) and alloy steel 3310 (AS3310) in 0.5 M H2SO4 solution was
done. The results show TTGP performed effectively on MS at 2% to 3.5% TTGP concentration with
final inhibition values of 71.70%, 79.25%, 83.58% and 92.45% at 240 h of exposure. Inhibition
efficiency generally increased with TTGP concentration and exposure time, although inhibition
efficiency at 2.5% 3% TTGP concentration decreased with exposure time. Effective TTGP inhibition
performance on AS3310 occurred at 3% and 3.5% TTGP concentration only with final values of
72.50% and 73.25%. Inhibition efficiency of TTGP on AS3310 varied non-proportionately with its
concentration. With respect to exposure time, inhibition efficiency of TTGP on AS3310 at all
concentrations decreased. Results from ANOVA analysis shows TTGP concentration significantly
influenced the performance output of TTGP extract with statistically significant factor of 85.73% and
84.78% (MS and AS3310). The corresponding values for exposure time, though determined to be
statistically relevant is overwhelmingly far below the influence of exposure time at values of 4.63 and
14.27. Standard deviation data shows inhibition efficiency of TTGP on MS varied minimally from
mean values at all concentrations (excluding 1.5% and 2% TTGP concentration). The corresponding
values for TTGP on AS3310 were also generally low at all concentrations signifying stable inhibition
performance. Data showed 48% and 18% of MS and AS3310 inhibition efficiency results are greater
than 80% effective inhibition performance threshold at margins of error of 12.64% and 10%
Keywords
TJ Mechanical engineering and machinery, TP Chemical technology