Corrosion behavior of a laser-welded NiTi shape memory alloy
Corrosion behavior of a laser-welded NiTi shape memory alloy
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DOI：
10.1016/j.matchar.2006.07.010
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发表时间：
2007-07-01
影响因子：
4.7
通讯作者：
Liu, X. P.
中科院分区：
文献类型：
--
作者：
Yan, X. J.;Yang, D. Z.;Liu, X. P.
用电化学方法(开路电位测量、线性极化和动电位极化)研究了激光焊接Ni-49.4 at.%Ti形状记忆合金及其母材在0.9%NaC l溶液中的腐蚀行为。结果表明，激光焊接NiTi合金的耐蚀性优于母材。与母材相比，激光焊接的NiTi合金具有更高的开路电位、更高的极化电阻、更宽的钝化区和更高的击穿电位。激光焊接NiTi合金耐蚀性的提高归因于表面光滑、无缺陷和无碳化物的存在。(C)2006 Elsevier Inc.保留所有权利。
Corrosion behaviors of the laser-welded Ni-49.4 at.% Ti shape memory alloy and base metal in 0.9% NaCl solution were investigated by means of electrochemical techniques (the open circuit potential measurement, linear and potentiodynamic polarizations). The results showed that corrosion resistance of the laser-welded NiTi alloy is better than that of the base metal. Compared to the base metal, the laser-welded NiTi alloy exhibits higher open circuit potential, higher polarization resistance, a wider passive region and higher breakdown potential. The improvement of corrosion resistance of the laser-welded NiTi alloy is ascribed to a smoother, defect free surface and an absence of carbides. (C) 2006 Elsevier Inc. All rights reserved.