Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第23卷    第z1期    总第1期    2013年12月

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文章编号:1004-0609(2013)S1-0320-06
稀土Y2O3添加对医用β型钛合金腐蚀行为的影响
宋 秀1,王 磊1,新家光雄2,仲井正昭2,刘 杨1,王 冉1,朱苗勇3

(1. 东北大学 材料与冶金学院 材料各向异性与织构教育部重点实验室,沈阳110819;
2. 日本东北大学 金属材料研究所,仙台980-8577;
3. 东北大学 材料与冶金学院,沈阳110819
)

摘 要: 将稀土Y2O3添加到TNTZ合金,旨在改善合金力学性能的同时提高合金的抗腐蚀性能。采用ZAHUER IM6电化学工作站测定合金在人体模拟液中的电化学阻抗图谱和极化曲线。结果表明:Y2O3能改善合金的耐腐蚀性能,使合金的腐蚀电流减小、腐蚀电位正向移动、阻抗值增加;随Y2O3质量分数的增加,合金的耐腐蚀性能先提高而后又降低。Y2O3对TNTZ合金耐蚀性能的影响受Y2O3的尺寸和分布控制,具有双重作用:作为阴极耐蚀相,弥散分布的Y2O3可以起到保护基体的作用;而当Y2O3尺寸增大或发生聚集、合金中阴极相的面积足够大时,Y2O3和基体间形成局部的电偶腐蚀,反而加速了基体的腐蚀。当Y质量分数为0.10%时,TNTZ合金耐腐蚀性能的改善最明显。

 

关键词: Ti-29Nb-13Ta-4.6Zr合金;腐蚀行为;Y2O3;极化曲线;人体模拟液

Effect of rare earth Y2O3 additions on corrosion behaviors of biomedical β-type titanium alloy
SONG Xiu1, WANG Lei1, NIIOMI Mitsuo2, NAKAI Masaaki2, LIU Yang1, WANG Ran1, ZHU Miao-yong3

1. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, School of Materials and Metallurgy,
Northeastern University, Shenyang 110819, China;
2. Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan;
3. School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China

Abstract:The rare earth Y2O3 was added to TNTZ titanium alloy to improve the corrosion resistance and enhance the mechanical properties of this alloy. ZAHUER IM6 electrochemical station was used to measure electrochemical impedance spectroscopy (EIS) and polarization curves of the testing alloys in simulated body fluid (SBF). The results show that corrosion resistance of TNTZ alloy is improved by adding Y2O3. The corrosion current decreases, and the corrosion potential moves to the positive direction. In addition, the impedance value also decreases. This improvement can be controlled by the diamenter and distribution of Y2O3 particles in the alloy, and it ascribes to the following two ascpects. On one hand, dispersive Y2O3 particles with small size can protect the matrix from being corroded as cathode corrosion phase; on the other hand, if Y2O3 particles grow up or accumulate, the cathode area becomes larger, thus the galvanic corrosion may occur in the local area between the Y2O3 particles and the matrix, restulting in the increased corrosion rate. The corrosion resistance of TNTZ alloy with 0.10% Y shows the best value among the alloys with different Y2O3 additions.

 

Key words: Ti-29Nb-13Ta-4.6Zr alloy; corrosion behavior; Y2O3; polarization curve; SBF

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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