Ru对Ti-6Al-4V合金腐蚀行为的影响及机理研究

doi:10.11902/1005.4537.2018.185

中国腐蚀与防护学报

2020, Vol. 40

Issue (1): 25-30 DOI: 10.11902/1005.4537.2018.185

研究报告

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Ru对Ti-6Al-4V合金腐蚀行为的影响及机理研究

王乐^1,²,易丹青^1,²,刘会群²(

),蒋龙³,冯春³

1. 中南大学轻合金研究院长沙 410083
2. 中南大学材料科学与工程学院长沙 410083
3. 中国石油集团石油管工程技术研究院西安 710065

Effect of Ru on Corrosion Behavior of Ti-6Al-4V Alloy and Its Mechanism

WANG Le^1,²,YI Danqing^1,²,LIU Huiqun²(

),JIANG Long³,FENG Chun³

1. Light Alloy Research Institute, Central South University, Changsha 40083, China
2. School of Materials Science and Engineering, Central South University, Changsha 410083, China
3. Tubular Goods Research Institute of CNPC, Xi'an 710065, China

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摘要:

利用电化学测试、EDS以及XPS，研究了Ru对Ti-6Al-4V (TC4) 合金在HCl溶液中腐蚀行为的影响，并结合对腐蚀产物和元素随深度分布的分析，探讨了Ru对TC4合金耐蚀性的影响机理。结果表明，添加Ru使TC4合金在10% (质量分数) HCl溶液中腐蚀电位升高，腐蚀电流密度降低，钝化电流基本保持不变；而使其在15% (质量分数) HCl溶液中的腐蚀速率降低，耐蚀性提高。TC4合金在HCl溶液中主要腐蚀产物为TiO₂，Al₂O₃和V₂O₅。在反应过程中，Ru起到有效的阴极改性作用，促进TiO₂钝化膜在表面沉积，使钝化膜增厚一倍，进而提高了钝化膜的致密性，使TC4合金的耐蚀性得到有效提高。

关键词 ： Ti-6Al-4V钛合金, Ru, 电化学, XPS, 耐蚀性机理

Abstract：

The effect of Ru addition on the corrosion behavior of Ti-6Al-4V (TC4) alloy in HCl solution were studied by means of electrochemical method, energy dispersive spectrometer (EDS) and X-ray photoelectron spectroscopy (XPS). The corrosion products and concentration variation of elements along surface depth were analyzed. The results showed that, the addition of Ru increased the corrosion potential of TC4 alloy in 10% (mass fraction) HCl solution from -0.585 V to -0.529 V, and the corrosion current density decreased from 6.193×10^-5 A/cm² to 2.750×10^-5 A/cm². The passive current densities changed a little, from 2.335×10^-5 A/cm² to 2.608×10^-5 A/cm². The addition of Ru reduced the corrosion rate of TC4 alloy in 15% (mass fraction) HCl solution from 1.48 mm/a to 0.94 mm/a as well. According to XPS results, the main corrosion products of TC4 alloy after corrosion in HCl solution were TiO₂, Al₂O₃ and V₂O₅. During the corrosion, Ru played an effective role in cathodic modification, promoted the deposition of TiO₂ passive film on the surface and thickened the passive film by one time. Therefore, Ru increased the denseness of the passive film, thereby improved the corrosion resistance of TC4 alloy effectively.

Key words： Ti-6Al-4V alloy Ru electrochemical XPS corrosion resistance mechanism

收稿日期: 2018-12-24

ZTFLH:

TG146.2

基金资助:国家科技重大专项(2016ZX05020-002)

通讯作者: 刘会群 E-mail: liuhuiqun@csu.edu.cn

Corresponding author: Huiqun LIU E-mail: liuhuiqun@csu.edu.cn

作者简介: 王乐，男，1993年生，硕士生

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引用本文:

王乐,易丹青,刘会群,蒋龙,冯春. Ru对Ti-6Al-4V合金腐蚀行为的影响及机理研究[J]. 中国腐蚀与防护学报, 2020, 40(1): 25-30.
Le WANG, Danqing YI, Huiqun LIU, Long JIANG, Chun FENG. Effect of Ru on Corrosion Behavior of Ti-6Al-4V Alloy and Its Mechanism. Journal of Chinese Society for Corrosion and protection, 2020, 40(1): 25-30.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2018.185 或 https://www.jcscp.org/CN/Y2020/V40/I1/25

表1 TC4和TC4-Ru合金的化学成分 (mass fraction / %)

图1 TC4和TC4-Ru合金在10%HCl溶液中的开路电位

图2 TC4和TC4-Ru合金在10%HCl溶液中的极化曲线

表2 TC4和TC4-Ru合金在10%HCl溶液中的阳极极化参数

图3 TC4和TC4-Ru合金在37 ℃下15%HCl溶液中的腐蚀速率

图4 TC4和TC4-Ru合金在37 ℃下15%HCl溶液中腐蚀3 h后的表面形貌

图5 TC4-Ru合金在HCl溶液中腐蚀10 d后的表面形貌

表3 图5中标注点的EDS分析结果 (mass fraction / %)

图6 TC4和TC4-Ru合金在37 ℃下15%HCl溶液中腐蚀10 d后表面的XPS谱

图7 TC4和TC4-Ru合金在37 ℃下15%HCl溶液中腐蚀10 d后Ti 2p峰随刻蚀深度的变化

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