Inhibitive characteristics of cetylpyridinium chloride and potassium chromate addition on type A513 mild steel in acid/chloride media
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Linear polarization resistance and open circuit potential methods were
used to assess the inhibitive and adsorption behaviour of Potassium chromate
(K2CrO4) and Cetylpyridinium chloride (CPC) on mild steel (MS) in HCl/NaCl solution.
Results obtained show that K2CrO4 and CPC inhibit MS significantly against massive
degradation. However, under open circuit potential method, inhibition efficiency of
K2CrO4 decreased at higher concentration. The synergistic effect of both inhibitors is
positive on the protection of mild steel against corrosion. An inhibitive efficiency of
over 60% was recorded for the combined admixture. Morphological study showed
that the exposed steel with the presence of K2CrO4 and CPC possess some corrosion
product with lesser pitting effect compare to unprotected steel with severe
surface deterioration and uniform corrosion degradation. The corrosion inhibition
performance of K2CrO4 and CPC on mild steel surface was found to follow Langmuir
adsorption isotherm model.
Keywords
T Technology (General), TJ Mechanical engineering and machinery, TP Chemical technology