Background: Due to the increase in the number of sour wells in today’s oil and gas industry,
reservoir souring and related acidizing issues must be considered as an essential concern for material
selection which significantly affect the application and performance of alloy steels.
Objective: The influence of deposited corrosion product layers on the electrochemical behavior of 13%
chromium stainless steel was investigated in an acidic solution to study the effect of a deposited elemental
sulfur and FeS layer on the electrochemical behavior of 13% chromium steel with particular emphasis
on the role of temperature, chloride concentration and morphological characterization of corrosion
Method: Cyclic polarization and also linear polarization resistance techniques were applied to measure
the corrosion parameters such as corrosion rate, Ecorr, Epit 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
Results: 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 initial deposited
layer on the sample surface.
Conclusion: Environmental variables, such as temperature and chloride concentration have an important
role in the corrosion resistance of 13% chromium steel which can indicate either protective or
destructive effects on the corrosion behavior of steel.