表面处理对TC21钛合金与铝合金和钢电偶腐蚀行为的影响

通过测定TC21钛合金与铝合金和钢电偶电流的方法,研究了TC21钛合金与铝合金和钢在使用接触时发生电偶腐蚀的敏感性.结果表明:TC21钛合金与铝合金和钢形成的电偶对极易发生电偶腐蚀,不能直接接触使用;对钛合金和铝合金分别进行阳极氧化处理可以在一定程度降低电偶腐蚀敏感性.TC21钛合金与钢形成的电偶对,电偶腐蚀行为与钢的成分有很大关系,对钛合金进行阳极氧化处理,对钢进行镀镉或镀镉-钛处理可以提高表面抗腐蚀性能,降低电偶腐蚀敏感性.当TC21钛合金与铝合金和钢接触使用时,必须采取有效的防护措施.

Effect of Surface Treatment on Galvanic Corrosion Between TC21 Titanium Alloy and Aluminium Alloys and Steels

The susceptibity to galvanic corrosion of TC21 titanium alloy and aluminum alloys and steels were studied by measuring current density of couples. The results indicated that it was easy to produce the serious galvanic corrosion between TC21 titanium alloy and aluminum alloys and steels. TC21 titanium alloy was prohibited to contact with aluminum alloys and steels directly. There was a low sensitivity to the galvanic corrosion between anodized titanium and anodized aluminum alloys. The galvanic corrosion behavior has relationship with the chemical compositions of steels. The anti corrosion property can be high by anodizing for titanium alloy and plating Cd or Cd-Ti for steels. It is necessary to protect for aluminum alloys or steels when they are used with TC21 titanium alloy.