采用极化曲线法和电化学阻抗法，分析了经不同时效时间后的2205双相不锈钢在3．5％的NaCl＋（1，5，10）g／LS介质溶液中的电化学腐蚀特性。研究表明：经过时效处理（800℃）的2205双相不锈钢会产生析出相（σ相），对2205双相不锈钢的腐蚀有严重影响；随着时间的延长，σ相析出量明显增多，耐腐蚀性越弱。此外，随着硫单质的加入，也促进了不锈钢的腐蚀。
Effect of aging treatment on electrochemical corrosion of 2205 duplex stainless steel (DDS) in 3.5% NaCl and (1, 5, 10) g/L S solution were studied by potentio-dynamic scanning (PDS) and electrochemical impendence spectroscopy (EIS). The research shows that the σ-phase was precipitated at the γ/α interfaces after aging treatment(800 ℃), it has a harmful effect on the corrosion of 2205 DDS. The corrosion rate of 2205 DDS increases with the amount of σ-phase, which increases with aging time. Besides, it also promotes the corrosion rate of 2205 DDS with adding sulfur.
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