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J Biomed Mater Res A. 2006 Apr;77(1):97-102.

Corrosion resistance of a laser spot-welded joint of NiTi wire in simulated human body fluids.

Author information

1
Department of Materials Engineering, Dalian University of Technology, Liaoning, Dalian, 116024, People's Republic of China. dreamto2008@sohu.com

Abstract

The purpose of this study was to investigate corrosion resistance of a laser spot-welded joint of NiTi alloy wires using potentiodynamic tests in Hank's solution at different PH values and the PH 7.4 NaCl solution for different Cl- concentrations. Scanning electron microscope observations were carried out before and after potentiodynamic tests. The composition of a laser spot-welded joint and base metal were characterized by using an electron probe microanalyzer. The results of potentiodynamic tests showed that corrosion resistance of a laser spot-welded joint of NiTi alloy wire was better than that of base metal, which exhibited a little higher breakdown potential and passive range, and a little lower passive current density. Corrosion resistances of a laser spot-welded joint and base metal decreased with increasing of the Cl- concentration and PH value. The improvement of corrosion resistance of the laser spot-welded joint was due to the decrease of the surface defects and the increase of the Ti/Ni ratio.

PMID:
16392124
DOI:
10.1002/jbm.a.30378
[Indexed for MEDLINE]

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