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为了减小钛合金与金属偶合的接触腐蚀,采用微弧氧化技术,在TC4钛合金表面生成了一层主要由A l2TiO5相、锐钛矿TiO2相及金红石TiO2相组成的多孔膜。研究了TC4钛合金微弧氧化前后与45钢、LY12铝合金和紫铜偶合的电偶腐蚀行为。结果表明:3种金属分别与TC4钛合金偶合时,45钢会发生严重的电偶腐蚀,LY12铝合会发生严重的不均匀点蚀,紫铜没有明显的腐蚀;与微弧氧化后TC4钛合金偶合时,45钢的电偶电流降低至原来的1/8,LY12铝合金降低至原来的1/11,紫铜降低至原来的1/3。TC4钛合金微弧氧化可有效地降低与之偶合金属的电偶腐蚀。
In order to reduce the contact corrosion of titanium alloy and metal coupling, a micro-arc oxidation technique was used to form a porous film mainly composed of A12TiO5 phase, anatase TiO2 phase and rutile TiO2 phase on TC4 titanium alloy surface. The galvanic corrosion behavior of TC4 titanium alloy coupled with 45 steel, LY12 aluminum alloy and copper before and after microarc oxidation was studied. The results show that when the three kinds of metals are respectively coupled with TC4 titanium alloy, serious galvanic corrosion occurs in 45 steel, serious non-uniform pitting corrosion occurs in LY12 aluminum alloy, and there is no obvious corrosion of copper. With the micro-arc oxidation of TC4 titanium alloy Coupling, 45 steel galvanic current reduced to the original 1/8, LY12 aluminum alloy reduced to the original 1/11, copper reduced to the original 1/3. Micro-arc oxidation of TC4 titanium alloy can effectively reduce the galvanic corrosion of the coupled metal.