Abstract
The corrosion resistance of solution annealing heat-treated type 2205 duplex stainless steel microstructures was assessed with a bipolar electrochemistry technique. Chemical element partitioning in both crystallographic phases was correlated to simulations of critical pitting temperatures. The as-received microstructure had the highest pit nucleation resistance, with high-temperature solution annealing treatment revealing reduced pit growth rates. Pit nucleation occurred either within the ferrite phase or at ferrite-austenite interfaces, with the resulting pit shape affected by the microstructure characteristics. The results of this study are discussed in the framework of microstructure design for enhanced corrosion resistance in duplex stainless steels.
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