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A Study on Preferential Weld Metal Corrosion in 316 Austenitic Stainless Steel in HCl Containing Environments

Type 316 austenitic stainless steel is routinely used to handle dry hydrogen chloride gases in petrochemical processes. However the presence of moisture changes the corrosion behavior by the formation of liquid hydrochloric acid. When 316 welds are exposed to HCl environment it is often found that weldments undergo severe corrosion compared to the base material. In order to clarify the mechanism of preferential weld corrosion microstructural analysis including determination of phase composition of 316 welds which had experienced preferential corrosion in condensed HCl was performed using SEM TEM and EBSD. In addition laboratory immersion test was also conducted to understand the corrosion behavior in aerated HCl solution. Corrosion arrack preferentially occurred either at austenite in dendrite cores or ferrite in inter-and intra-dendritic boundary depending on the concentration of HCl. It is suggested that ferrite is more resistant to mild HCl corrosion than austenite due to the stability of passive film. On the other hand in highly reducing HCl solutions ferrite has inferior corrosion resistance compare to austenite. Galvanic corrosion between the two constituent phases is proposed to lead to selective weld metal corrosion.

Product Number: 51319-13248-SG
Author: Hyunjoon Park
Publication Date: 2019
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