Performance evaluation of the corrosion protection of admixture of Cymbopogon nardus and Commiphora myrrha on high carbon steel in CH3COOH and C6H8O7 solution
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Elsevier
Abstract
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Data from weight loss analysis on the protection performance of the combined admixture of Cymbopogon
nardus and Commiphora myrrha (CCM) oil extracts on high carbon steel (HC-S) in 3 M CH3COOH and
C6H8O7 acid solution was analysed. CCM extract performed effectively in CH3COOH solution at minimum–
maximum values of 53.06% and 80.12% at 168 h of exposure. These value corresponds with corrosion
rate data of 1.238 mm/y and 0.525 mm/y relative to corrosion rate of HC-S (2.638 mm/y) at 0% CCM
concentration. CCM performed poorly in C6H8O7 solution with minimum–maximum values of 12.83% and
43.81% which corresponds to corrosion rates of 6.115 mm/y and 3.942 mm/y relative to corrosion rate
value of 7.015 mm/y at 0% CCM concentration. The protection performance of CCM extract varies more
significantly with respect to CCM concentration compared to measurement time. The statistical significance
factor of CCM concentration in both acids are 64.85% and 93.93% compared to the corresponding
values for measurement time at 25.95% and 4.11%. Standard deviation data for CCM extracts in
CH3COOH varied minimally from median values at 0.42% to 1.25% CCM concentration compared to the
value at 1.67% CCM concentration. The standard deviation values for CCM in C6H8O7 solution were relatively
smaller than the values in CH3COOH solution signifying greater thermodynamic stability. Data
shows that 39.3% of CCM protection performance data in CH3COOH is greater than 65% efficiency at margin
of error of 18.1%. The corresponding value for CCM in C6H8O7 solution is zero wherewith none of the
protection performance data is greater than 65% protection efficiency.
Keywords
TJ Mechanical engineering and machinery, TP Chemical technology