金属在海水中的腐蚀电位研究

获得了３８种金属在天然海水中浸泡１８０ｄ的腐蚀电位数据，列出了它们在海水中的腐蚀电位序，讨论了金属材料在海水中的腐蚀电位特性，分析了它们在海水中的腐蚀电位与耐蚀性的关系。结果表明，钝化能力强的金属，其腐蚀电位随浸泡时间变化较大，电位稳定时间较长，非钝化金属和钝化能力弱的金属则相反，对铝合金来说，初始电位，稳定电位较负，其耐蚀性较好，反之则较差。对不锈钢来说，稳定电位较正，其耐蚀性较好，反之则较差。

STUDY OF THE CORROSION POTENTIAL OF METALS IN SEAWATER

Corrosion potential data of 38 metallic materials immersed in seawater were obtained. Galvanic series and the stable corrosion potential of the metals in seawater were lined up. Corrosion potential characters and relationship between the corrosion potential and corrosion resistance of metals were discussed. The corrosin potential of metals that had high passivation capability changed more markedly with time and the time for the potential to become stable was longer; For non passive metals and metals which had poor passivation capability, the situation is opposite. Aluminium alloys which had relatively negative initial potential and stable potentiasl were corrosion resistant, while aluminium alloys which had relatively positive initial potential and stable potential were not corrosion resistant. Stainless steels that had relatively positive stable potential were corrosion resistant, while stainless steels that had relatively negative stable potential were not corrosion resistant.