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The corrosion behavior was investigated for each heat-affected zone (HAZ) comprising a FH32 steel immersed in 3.5% NaCl solutions. To research the corrosion behavior of each HAZ sub-region, HAZ thermo-mechanical simulations were performed prior to the electrochemical tests. The results revealed that the corrosion resistance of the fine-grained HAZ (FGHAZ) comprising the steel is superior to that of other HAZ sub-regions. Moreover, the coarse-grained HAZ (CGHAZ) exhibited the worst corrosion resistance of the weld joint. The changes in the corrosion resistance of the HAZ sub-regions were attributed to variations in the microstructural sensitivity to corrosion behavior. Furthermore, the results indicated that the number, size, and distribution of martensite/austenite (M/A) constituents, as well as the grain size of the relevant phase can affect the resistance.

international journal of electrochemical science

Investigation of Influence of Microstructure on FH32 Steel Corrosion Properties using Gleeble Simulation of Heat-Affected Zone and Electrochemical Methods