Cu—Zn—Al形状记忆合金的缝隙腐蚀

Crevice Corrosion of the Shape Memory Alloy Cu-Zn-Al

摘要:

采有利民化学方法研究了Cu-Zn-Al形状记忆合金及其BTA钝化处理试样在Hank′s人工体液中的缝隙腐蚀行为。结果表明：在人工体液中，Cu-Zn-Al形状记忆合金的耐缝隙腐蚀性能优于未进行热处理的Cu-Zn-Al合金，其作用机理是单相马氏体组织改善了合金的电化学行为，抑制了活性溶解，缝隙腐蚀的发生是由于形成了金属离子浓差电池。经BTA钝化后，Cu-Zn-Al形状记忆合金的耐缝隙腐蚀性能得到改善。

Abstract:

The crevice corrosion of the benzotriazole(BTA) passive specimens of the shape memory alloy Cu Zn Al in Hank's artificial body fluid has been studied using electrochemical tests. The results show that the shape memory alloy Cu Zn Al exhibits better property than the annealed alloy Cu Zn Al. The reason is that the martensite single phase in the alloy Cu Zn Al improves electrochemical property and inhibits active solution. The occurring of crevice corrosion is attributed to the metal ions concentration cell. BTA passivation improves the crevice corrosion resistance of the alloy.