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采用极化曲线、电化学阻抗技术和浸泡实验对Incoloy825合金在不同温度(30~60℃)3.5%NaCl溶液中的腐蚀行为进行了研究。结果表明:随温度的升高,Incoloy825合金的腐蚀程度有所加剧,点蚀坑的大小和密集度增加,腐蚀形态由全面腐蚀为主转变为以点蚀为主的局部腐蚀。Incoloy825合金的腐蚀速率随温度的升高而增大,这是温度对电极过程两个相反作用(含氧量降低的阻滞作用和离子活性增强的促进作用)的综合影响结果。温度的升高引起Cl~-活性的增强对腐蚀的促进占主导作用。
The corrosion behavior of Incoloy825 alloy in 3.5% NaCl solution at different temperatures (30-60 ℃) was investigated by polarization curves, electrochemical impedance spectroscopy and immersion experiments. The results show that with the increase of temperature, the corrosion of Incoloy825 alloy is aggravated, the size and concentration of pits increase, and the corrosion morphology changes from full corrosion to pitting-dominated local corrosion. The corrosion rate of Incoloy825 alloy increases with increasing temperature, which is the combined effect of temperature on the two opposite effects of the electrode process (retardation of oxygen reduction and enhancement of ionic activity). The increase of temperature causes the increase of Cl ~ - activity and the promotion of corrosion plays a dominant role.