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Effect of Deposited Corrosion Product Layers on Electrochemical Behav-ior of Conventional 13% Cr Steel Exposed to Chloride Containing Environment

Author(s):

Ladan Khaksar * and John Shirokoff   Pages 1 - 10 ( 10 )

Abstract:


The influence of deposited corrosion product layers on the electrochemical behavior of 13% chromium stainless steel was investigated in an acidic solution. Cyclic polarization and also linear polarization resistance techniques were applied to measure the corrosion parameters such as corrosion rate, Ecorr, Epit, Epp, ∆E, and Ipass of 13% chromium steels at various temperatures and chloride concentrations. All the electrochemical measurements were performed at 25 and 75 °C with addition of 0, 10 and 20 g/L NaCl in 0.01 M hydrochloric acid solution. Surface measurement techniques such as SEM, EDS, and AFM were applied for morphological analysis of the corrosion products. The overall objective of this research is to study the effect of deposited elemental sulfur and iron sulfide layers on the corrosion behavior of 13% chromium steel with particular emphasis on the role of temperature and chloride concentration. The results showed that both temperature and chloride concentration had significant effects on corrosion parameters; however, these effects on the corrosion rates in the presence of elemental sulfur were significantly higher than those in the presence of an iron sulfide layer or without any initially deposited layer on the sample surface.

Keywords:

Corrosion product layers, 13% chromium stainless steel, Chloride-containing environment, Elemental sulfur, Electrochemical behavior, Iron sulfide

Affiliation:

Memorial university of newfoundland, Memorial University of Newfoundland - Process engineering St. John`s, NL



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