Effect of Two Kinds of Heat Treatment on Corrosion Behavior of 2205 Duplex Stainless Steel

The effect of two kinds of heat treatment on the corrosion behavior of 2205 duplex stainless steel was investigated by means of polarization curves, immersion testing and morphology observation. The experiment results indicated that the heat treatment at 950 ℃ for 30 min followed by furnace cooling decreased the corrosion resistance of 2205 duplex stainless steel significantly, which was attributed to the formation of Cr23C6 and σ phase.