Effects of surface finishing and dissolved oxygen on the polarization behavior of Zr65Al7.5Ni10Cu17.5 amorphous alloy in phosphate buffered solution
Effects of surface finishing and dissolved oxygen on the polarization behavior of Zr65Al7.5Ni10Cu17.5 amorphous alloy in phosphate buffered solution
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DOI：
10.1016/s0010-938x(00)00043-3
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发表时间：
2000-12
影响因子：
8.3
通讯作者：
S. Hiromoto;A. Tsai;M. Sumita;T. Hanawa
中科院分区：
文献类型：
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作者：
S. Hiromoto;A. Tsai;M. Sumita;T. Hanawa
研究了表面处理和磷酸盐缓冲溶液中溶解氧对Zr65Al7.5Ni10Cu17.5非晶合金腐蚀行为的影响，为该合金在生物材料中的应用提供了依据。在脱气电解液中极化未抛光和抛光的合金，并且抛光的合金也用各种浓度的溶解氧极化。用X射线光电子能谱对合金表面进行了表征。抛光后合金表面氧化层中的金属镍和氢氧根离子使合金的耐蚀性下降。抛光后的抗点蚀性能也随着氢氧根离子的增加而降低。另一方面，由于表面氧化物中的氢氧根离子和吸附的磷酸根离子减少，通入4%O2后，抗点蚀性能提高。然而，高于4%O2的氧气阻止了镍的溶解，导致抗点蚀性下降。当pH为2.2时，溶解氧不会影响抗点蚀性，因为表面氧化物的溶解度增加。
The present study evaluates the effects of surface finishing and dissolved oxygen in phosphate buffered saline solution on the corrosion behavior of Zr65Al7.5Ni10Cu17.5amorphous alloy for the application of the alloy to biomaterials. Non-polished and polished alloys were polarized in deaerated electrolyte, and the polished alloy was also polarized with various concentrations of dissolved oxygen. The surface of the alloy was characterized using X-ray photoelectron spectroscopy. The corrosion resistance of the alloy decreased with metallic nickel and hydroxide ion in surface oxide after polishing. The pitting corrosion resistance also decreased with the hydroxide ion after polishing. On the other hand, the pitting-corrosion resistance increased with aerating 4% O2because of the decrease of hydroxide ion and adsorbed phosphate ion in the surface oxide. However, oxygen above 4% O2prevented dissolution of nickel, causing the decrease of the pitting-corrosion resistance. When the pH was 2.2, the dissolved oxygen did not influence the pitting-corrosion resistance because of the increased solubility of the surface oxide.