采用线性极化电阻、塔菲尔曲线法和电化学阻抗谱(EIS)技术研究了316L不锈钢(316LSS)在不同电导率海水和NaCl溶液中的电化学腐蚀行为.结果表明,316LSS在两种腐蚀介质中的极化电阻(Rp)、自腐蚀电位(Ecorr)和点蚀电位(Eb100)均随电导率的升高而降低.同时EIS显示电导率对电荷转移电阻(R1)影响不大,而对膜电阻(R2)影响较大,说明随电导率的变化,腐蚀介质中侵蚀离子主要影响316LSS的钝化膜的稳定性.316LSS在NaCl溶液中的R2、Ecorr、Eb100值比在相同电导率海水中分别最大减少了6.5×105Ω· cm2、54mY和143mY,说明在电导率相同时,316LSS更易在NaCl溶液中发生腐蚀.因此,在海水源热泵系统应用研究中,应该尽量采用实际海水作为腐蚀介质.
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