Lee T M, Chang E, Yang C Y
Department of Materials Science and Engineering, National Cheng Kung University, Tainan, Taiwan.
J Mater Sci Mater Med. 1998 Aug;9(8):429-37. doi: 10.1023/a:1008863232494.
The corrosion characteristics of the brazed Ti6Al4V specimens were analysed and compared with respect to the conventionally heat-treated specimens by an electrochemical corrosion test. The object of this research was to explore the potentiality of the brazed titanium for biomaterials. The characteristics of the 1300 degrees C heat-treated and the 970 degrees C brazed specimens, with passivation and sterilization treatment, were evaluated by measurement of corrosion potential, Ecorr, corrosion current densities, Icorr, polarization resistance of the reacted surface films, Rp, in a potentiodynamic test. The experimental results show that the corrosion rates of the heat-treated and the brazed samples are similar at Ecorr, and the value of Ecorr for the brazed sample is noble to the heat-treated samples. The passive current density of the brazed specimen is either lower or higher than the heat-treated specimen, depending on the polarization potential. By Auger electron spectroscopic and high-resolution X-ray photoelectron spectroscopic analysis on specimens from the potentiostatic test, the elements of copper and nickel in the brazing filler were not detected while less alumina was found in the reacted film of the brazed specimens when compared with the heat-treated specimens. The implication of the results is discussed.
通过电化学腐蚀试验，分析并比较了钎焊Ti6Al4V试样与传统热处理试样的腐蚀特性。本研究的目的是探索钎焊钛作为生物材料的潜力。通过在动电位试验中测量腐蚀电位Ecorr、腐蚀电流密度Icorr、反应表面膜的极化电阻Rp，对经过1300℃热处理和970℃钎焊且经过钝化和灭菌处理的试样特性进行了评估。实验结果表明，在Ecorr下，热处理试样和钎焊试样的腐蚀速率相似，且钎焊试样的Ecorr值比热处理试样更正向。钎焊试样的钝化电流密度根据极化电位的不同，要么低于要么高于热处理试样。通过对恒电位试验后的试样进行俄歇电子能谱和高分辨率X射线光电子能谱分析，未检测到钎料中的铜和镍元素，且与热处理试样相比，钎焊试样的反应膜中发现的氧化铝较少。对结果的意义进行了讨论。
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