双相不锈钢中的铁素体(α相)和奥氏体(γ相)具有不同的晶体结构和化学成分,使之在水溶液环境中表现不同的耐蚀特征.本文应用空间分辨电化学技术测量2205双相不锈钢中铁素体和奥氏体的电位差异,并用电镜技术分析了α相和γ相的选择性腐蚀形态.结果表明,在0.01mol/LNaCl溶液中,铁素体的腐蚀电位比奥氏体高,而在2mol/LH2SO4+xmol/LHCl溶液中,双相不锈钢在活化＿钝化电位区出现两个明显的阳极电流峰.铁素体相的选择性腐蚀发生在较负的阳极峰电位,而奥氏体则在较正的阳极电位峰发生选择性腐蚀. The ferrite (α phase) and austenite (γ phase) in duplex stainless steel have different crystal structure and chemical composition, which make them exhibit different corrosion resistance characteristics in aqueous solution environment.This paper uses the technique of space-resolved electrochemical measurement 2205 duplex stainless steel in the ferrite and austenite potential differences, and the use of electron microscopy analysis of α phase and γ selective corrosion morphology results show that in 0.01mol / LNaCl solution, the corrosion potential of ferrite than the Austrian But in the 2mol / LH2SO4 + xmol / LHCl solution, two obvious anodic current peaks appear in the activation-passivation potential zone of duplex stainless steel.The selective corrosion of ferrite phase occurs at the more negative anodic peak While austenite is selectively etched at the more positive anodic potential.