Development of sintered Ti-30mass%Mo alloy and its corrosion properties |
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Authors: | Shigeya Sakaguchi Kenji Nakahara Yasunori Hayashi |
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Affiliation: | (1) Kiyama Factory, Nippon Tungsten Co., Ltd., 3173-2, Sonobe, Kiyama-cho, Miyaki-gun, 841-0203 Saga, Japan;(2) Department of Materials Science and Engineering, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, 812-8581 Fukuoka, Japan |
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Abstract: | Ti-30mass%Mo alloy is characterized by far better corrosion resistance than pure titanium in non-oxidizing acid such as 35%
HC1 solution. This alloy was newly developed in this work by a powder metallurgical process, because the conventional melting-casting
process had difficulties in manufacturing the alloy owing to its heavy gravity segregation. The corrosion behavior of sintered
Ti-30Mo alloy was studied by both immersion test and electro-chemical measurement. The corrosion rate of 1.3X10−2mm/yearxxx] was obtained by immersion test in 35% HC1 solution, which was 103 times superior to that of pure titanium. The potentio-dynamic polarization curve of this alloy in 35% HC1 solution showed
more noble corrosion potential and lower anodic current density than those of pure titanium. The passive film formed on the
alloy, in which Mo was enriched by preferential dissolution of titanium, thought to suppress the anodic reaction and improve
its corrosion resistance. |
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Keywords: | Key word" target="_blank">Key word Ti-Mo alloy powder metallurgy corrosion property soaking test electro-chemical measurement |
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