中国激光, 2019, 46 (9): 0902005, 网络出版: 2019-09-10   

激光选区熔化成形Ti-5%TiN复合材料在Hank溶液中的电化学腐蚀性能 下载: 1117次

Electrochemical Corrosion Properties of Ti-5%TiN Composites Formed by Selective Laser Melting in Hank''''s Solution
作者单位
天津工业大学物理科学与技术学院激光技术研究所, 天津 300387
摘要
采用动电位极化曲线和电化学阻抗谱研究了激光选区熔化成形CP-Ti和Ti-5%TiN复合材料在人工模拟体液Hank溶液中的腐蚀性能,结果表明:激光选区熔化成形CP-Ti主要由针状α-Ti相组成,加入的TiN颗粒不仅可以与钛基体形成良好的界面结合,还可以细化α-Ti晶粒并产生更多的晶界;在Hank溶液中,激光选区熔化成形Ti-5%TiN复合材料具有比激光选区熔化成形CP-Ti更好的耐腐蚀性能,这是因为作为微阴极的TiN颗粒均匀地分布在钛基体内,可以加速钛基体的阳极溶解过程,使Ti-5%TiN复合材料能够优先进入钝化状态。
Abstract
Corrosion properties of CP-Ti and Ti-5%TiN composites produced through selective laser melting (SLM) in an artificial simulated body fluid (Hank''s solution) were investigated by using potentiodynamic polarization curves and electrochemical impedance spectra. The results demonstrate that SLM-produced CP-Ti primarily comprises the acicular α-Ti phase. The addition of TiN particles can bond well with the titanium matrix and refine the α-Ti grains, resulting in more grain boundaries. An SLM-produced Ti-5%TiN sample possesses better corrosion resistance than an SLM-produced CP-Ti sample in Hank''s solution because the tiny TiN particles, which act as micro-cathodes, are uniformly distributed in the titanium matrix. This accelerates the anodic dissolution process of the titanium matrix and allows the Ti-5%TiN composite to first enter the passivation state.

赵宇, 宋振明, 金剑波, 谢敏, 赵淑珍, 周圣丰. 激光选区熔化成形Ti-5%TiN复合材料在Hank溶液中的电化学腐蚀性能[J]. 中国激光, 2019, 46(9): 0902005. Zhao Yu, Song Zhenming, Jin Jianbo, Xie Min, Zhao Shuzhen, Zhou Shengfeng. Electrochemical Corrosion Properties of Ti-5%TiN Composites Formed by Selective Laser Melting in Hank''''s Solution[J]. Chinese Journal of Lasers, 2019, 46(9): 0902005.

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