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Ti6Al4V鈦合金滲碳層在HF中的腐蝕行為

2021-04-19 13:11:12 作者：李坤茂來源：材料研究學(xué)報(bào) 分享至：

Ti6Al4V鈦合金滲碳層在HF中的腐蝕行為

李坤茂, 劉靜, 張曉燕, 李宏, 代燕

1. 貴州大學(xué)材料與冶金學(xué)院貴陽(yáng) 550003

2. 貴州師范大學(xué)材料與建筑工程學(xué)院貴陽(yáng) 550025

Corrosion Behavior of Carburized Ti6Al4V Ti-alloy in HF Solution

Li Kunmao, LIU Jing, ZHANG Xiaoyan, LI Hong, DAI Yan

1. College of Materials and Metallurgy, Guizhou University, Guiyang 550003, China

2. School of Materials and Architectural Engineering, Guizhou Normal University, Guiyang 550025, China

摘要

用真空感應(yīng)滲碳方法對(duì)Ti6Al4V鈦合金進(jìn)行高速滲碳，研究了滲碳層在HF溶液中的腐蝕行為。對(duì)腐蝕前后滲碳層的相結(jié)構(gòu)和形貌的分析發(fā)現(xiàn)：對(duì)Ti6Al4V鈦合金高速滲碳后，在表面生成一層TiC和CTi0.42V1.58復(fù)合化合物相的滲碳層。因?yàn)楸砻嬗袧B碳層，Ti6Al4V鈦合金在濃度為0.2%的HF中？泡其腐蝕速率從4.65×10-10 g·m-2·h-1降低到3.3×10-10 g·m-2·h-1。電化學(xué)腐蝕測(cè)試結(jié)果表明，其自腐蝕電位從未滲碳時(shí)的-0.94 V升高到-0.68 V,腐蝕電流密度從4.10 mA·cm-2降至1.65 mA·cm-2,極化電阻從6.36 Ω·cm2增大到15.8 Ω·cm2,Rt從0.2 Ω·cm2增大到5.7 Ω·cm2。滲碳層具有n型半導(dǎo)體特性，未滲碳樣品具有p型半導(dǎo)體特性。Ti6Al4V鈦合金滲碳后，在腐蝕過程中電子轉(zhuǎn)移的阻力增大，使耐蝕性提高。F-對(duì)Ti6Al4V鈦合金滲碳層的腐蝕機(jī)理，主要是析氫腐蝕。

關(guān)鍵詞：材料表面與界面 ; 滲碳 ; 感應(yīng)加熱 ; Ti6Al4V ; 組織 ; 腐蝕行為

Abstract

The rapid carburization of Ti6Al4V titanium alloy was carried out by vacuum induction carburizing method. The corrosion behavior of carburized Ti-alloy in HF solution was investigated. Results show that after rapid carburization a layer of TiC and CTi0.42V1.58 composite compound was formed on the surface of T-alloy, and in comparison with the blank Ti-alloy, the corrosion rate in 0.2% HF solution decreases from 4.65×10-10 g·m-2·h-1 to 3.3×10-10 g·m-2·h-1 for the carburized Ti-alloy. Correspondingly, the free-corrosion potential increased from -0.94 V to -0.68 V, the corrosion current density decreased from 4.10 mA·cm-2 to 1.65 mA·cm-2, the polarization resistance increases from 6.36 Ω·cm2 to 15.8 Ω·cm2 and Rt increases from 0.2 Ω·cm2 to 5.7 Ω·cm2. The corrosion product of carburized layer mainly exhibits n-type semiconductor characteristics, and that of the blank Ti-alloy exhibits p-type semiconductor characteristics. The corrosion mechanism of F- on the carburized layer of Ti6Al4V Ti-alloy is mainly hydrogen evolution corrosion.

Keywords： surface and interface ; carburizing ; induction heating ; Ti6Al4V ; microstructure ; corrosion behavior