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Pb对690合金腐蚀行为的影响

DOI: 10.3969/j.issn.1006-7043.201403020

Keywords: 690合金, 局部电化学交流阻抗, 穿晶型应力腐蚀开裂,, 腐蚀行为

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Abstract:

为探讨Pb对690合金腐蚀行为的影响开展了有/无Pb的腐蚀试验,采用扫描电镜(SEM)方法、局部电化学交流阻抗(LEIS)方法分别研究了690合金在有/无Pb的NaOH溶液中应力腐蚀行为、电化学行为。扫描电镜分析结果表明表面腐蚀形貌有差异,Pb存在于腐蚀产物中。应力腐蚀试验结果表明,690合金在含Pb的NaOH溶液中发生了穿晶型应力腐蚀开裂。局部电化学交流阻抗谱表明,含1 000 mg/L Pb的NaOH溶液中690合金的电化学阻抗分散性较大。690合金在含Pb溶液中具有较高的应力腐蚀敏感性。

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