钝性纯Ti在人工海水中的电化学活化行为研究

doi:10.11902/1005.4537.2018.050

中国腐蚀与防护学报

2019, Vol. 39

Issue (2): 123-129 DOI: 10.11902/1005.4537.2018.050

研究报告

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钝性纯Ti在人工海水中的电化学活化行为研究

严少坤¹,郑大江¹,韦江¹,宋光铃¹(

),周廉²

1. 厦门大学材料学院厦门大学海洋材料腐蚀防护研究中心厦门 361005
2. 南京工业大学先进金属材料研究院南京 211800

Electrochemical Activation of Passivated Pure Titanium in Artificial Seawater

Shaokun YAN¹,Dajiang ZHENG¹,Jiang WEI¹,Guangling SONG¹(

),Lian ZHOU²

1. Center for Marine Materials Corrosion & Protection, College of Materials, Xiamen University, Xiamen 361005, China
2. Institute of Advanced Metallic Materials, Nanjing Tech University, Nanjing 211800, China

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摘要:

通过恒电位极化、电化学阻抗 (EIS) 和动电位扫描曲线，跟踪监测了TA2纯Ti在人工海水溶液中的电化学钝化与特定电位的活化过程，研究了不同海水成分对该过程的影响。结果表明，在1.6 V (SCE) 附近出现电流峰，有一定的活化过程。结合SEM和析氧监测结果对电流峰进行了分析，显示1.4~1.6 V (SCE) 电位范围内形成的膜层会出现明显缺陷，并且TA2表面没有气泡冒出。Mott?Schottky拟合结果显示，在出现电流峰的电位区间，钛表面膜的半导体性质发生了转变。

关键词 ：纯Ti, 钝化膜, 电化学测试, 海水成分

Abstract：

As one of the most corrosion resistant metallic material, Ti or its alloy may find a variety of applications in the marine industry. It is important to understand the passivation mechanism of Ti in seawater. In this paper, the activation process of a passivated pure titanium TA2 in artificial seawater was investigated by means of potentiostat polarization, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The influence of seawater composition on the activation behavior was also studied. The result showed that the activation occurred around 1.6 V (SCE). Scanning electron microscope (SEM) and oxygen evolution monitoring indicated that obvious defects emerged on the surface of TA2 but no bubble was detected by applied potentials in the range of 1.4~1.6 V (SCE). According to Mott?Schottky analysis of the passivated and activated TA2 surface, the activation might be attributed to a transition of the semiconducting performance of the surface film on TA2.

Key words： pure titanium passive film electrochemical measurement seawater composition

收稿日期: 2018-04-17

ZTFLH:

TG178

基金资助:国家自然科学基金(51671163)

通讯作者: 宋光铃 E-mail: guangling.song@hotmail.com

Corresponding author: Guangling SONG E-mail: guangling.song@hotmail.com

作者简介: 严少坤，男，1992年生，硕士生

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引用本文:

严少坤,郑大江,韦江,宋光铃,周廉. 钝性纯Ti在人工海水中的电化学活化行为研究[J]. 中国腐蚀与防护学报, 2019, 39(2): 123-129.
Shaokun YAN, Dajiang ZHENG, Jiang WEI, Guangling SONG, Lian ZHOU. Electrochemical Activation of Passivated Pure Titanium in Artificial Seawater. Journal of Chinese Society for Corrosion and protection, 2019, 39(2): 123-129.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2018.050 或 https://www.jcscp.org/CN/Y2019/V39/I2/123

图1 TA2纯Ti在人工海水和含不同海水离子的NaCl溶液中的动电位扫描曲线

图2 TA2纯Ti在人工海水中不同恒电位下极化不同时间后的析氧照片

图3 TA2纯Ti在人工海水中不同恒电位下极化2 h后的监测电流密度

图4 TA2在人工海水溶液中不同极化电位极化5 h后的Nyquist图及放大图像

图5 TA2在人工海水中经过5 h极化后的等效电路图和电化学阻抗拟合值

图6 TA2抛光样品在人工海水中不同恒电位下极化2 h的SEM像

图7 依据Mott?Schottky模型在0.1~1.4 V和1.8~3.2 V范围内对EIS线性拟合结果 (三角形数据点不参与拟合)

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