Inhibitive characteristics of cetylpyridinium chlorideudand potassium chromate addition on type A513udmild steel in acid/chloride media

摘要

Linear polarization resistance and open circuit potential methods wereudused to assess the inhibitive and adsorption behaviour of Potassium chromateud(K2CrO4) and Cetylpyridinium chloride (CPC) on mild steel (MS) in HCl/NaCl solution.udResults obtained show that K2CrO4 and CPC inhibit MS significantly against massiveuddegradation. However, under open circuit potential method, inhibition efficiency ofudK2CrO4 decreased at higher concentration. The synergistic effect of both inhibitors isudpositive on the protection of mild steel against corrosion. An inhibitive efficiency ofudover 60% was recorded for the combined admixture. Morphological study showedudthat the exposed steel with the presence of K2CrO4 and CPC possess some corrosionudproduct with lesser pitting effect compare to unprotected steel with severeudsurface deterioration and uniform corrosion degradation. The corrosion inhibitionudperformance of K2CrO4 and CPC on mild steel surface was found to follow Langmuirudadsorption isotherm model.