目前,国内对镍基690合金在超纯水中的腐蚀行为报道不多.利用动电位极化和电化学阻抗法研究了镍基690合金在常温超纯水中的电化学行为；利用扫描电镜、能谱和X射线衍射等方法研究了镍基690合金在高温高压超纯水中的腐蚀行为.结果表明:镍基690合金在纯水中常温下具有较小的腐蚀电流密度和较大的阻抗,耐蚀性较好；镍基690合金在高温高压超纯水中浸泡4400h后,表面仅产生轻微腐蚀,腐蚀产物由双层钝化膜结构组成,外层富Ni内层富Cr,可有效抑制腐蚀反应的进一步发生,从而表现出优良的耐蚀性能.
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