高温影响下化工设备钛合金的电化学腐蚀机制

doi:10.16265/j.cnki.issn 1003-3033.2021.01.014

中国安全科学学报 ›› 2021, Vol. 31 ›› Issue (1): 95-101.doi: 10.16265/j.cnki.issn 1003-3033.2021.01.014

高温影响下化工设备钛合金的电化学腐蚀机制

王静虹¹ 教授, 孟庆龙^1,2, 王仓天¹, 支有冉³ 副教授

1 南京工业大学安全科学与工程学院,江苏南京 211816;
2 江苏苏博特新材料股份有限公司, 江苏南京 211103;
3 南京工程学院机械工程学院, 江苏南京 210009

收稿日期:2020-10-20 修回日期:2020-12-05 出版日期:2021-01-28 发布日期:2021-07-28
作者简介:王静虹 (1986—),女,江苏太仓人,博士,教授,主要从事公共安全与应急管理、化工安全、风险评估等方面的研究。E-mail: arain@njtech.edu.cn。
孟庆龙 (1995—),男,江苏盐城人,硕士,主要从事化工设备腐蚀防护、设备风险评价等方面的研究。E-mail: 414522778@qq.com。
基金资助:
国家自然科学基金资助(51606092,21406115)。

Electrochemical corrosion mechanism of titanium alloy in chemical equipment under influence of high temperature

WANG Jinghong¹, MENG Qinglong^1,2, WANG Cangtian¹, ZHI Youran³

1 College of Safety Science and Engineering, Nanjing Tech University, Nanjing Jiangsu 211816, China;
2 Sobute New Materials Co., Ltd., Nanjing Jiangsu 211103, China;
3 College of Mechanical Engineering, Nanjing Institute of Technology, Nanjing Jiangsu 210009, China

Received:2020-10-20 Revised:2020-12-05 Online:2021-01-28 Published:2021-07-28

摘要/Abstract

摘要： 为预防化工用钛设备在遭遇火灾等高温影响后由于耐蚀性下降而导致的设备腐蚀失效事故,利用电化学试验技术,通过极化曲线与电化学阻抗谱(EIS)研究化工设备钛合金Ti-6Al-4V(TC4)在高温处理后叠加空冷与水冷后的腐蚀行为特征,并构建相应的电化学腐蚀模型,利用该模型探究EIS特征与孔洞深度之间的关系。研究结果表明:高温处理后经空冷与水冷的TC4试样分别在1 050和910 ℃下的腐蚀电流密度最低,且水冷更低于空冷,即在接近相变点温度(约1 000 ℃)附近,水冷相较于空冷可使TC4获得更好的抗腐蚀能力,故钛设备过火后水冷是更好的冷却措施;EIS特征与孔洞深度之间的关系可较为准确地反映TC4的腐蚀情况。

关键词: 高温热处理, 化工设备, 钛合金, Ti-6Al-4V(TC4), 电化学腐蚀, 冷却方式

Abstract: In order to prevent corrosion accidents of equipment due to decrease in corrosion resistance of titanium materials after suffering from high temperature of a fire in chemical industry, corrosion behavior characteristics of titanium alloy TC4 after being treated by high temperature and different cooling methods, i.e., air cooling and water cooling, were studied through polarization curve and electrochemical impedance spectroscopy (EIS) by using electrochemical test technology. Then, a corresponding electrochemical corrosion model was constructed to explore relationship between characteristics of EIS and pore depth. The results show that TC4 sample can obtain the lowest corrosion current density after air cooling and water cooling treatment respectively at 1 050 and 910 ℃ with that of water cooling lower than air cooling. This means that when heating temperature is close to phase transition point temperature (about 1 000 ℃) of TC4, water cooling can make samples more resistant to corrosion than the other. Therefore, it proves to be a better cooling measure after titanium equipment is exposed to fire. In addition, based on results of scanning electron microscope, it is found that relationship between EIS characteristics and hole depth could reflect corrosion of TC4 more accurately. So the proposed model provides a theoretical basis for corrosion severity evaluation of titanium alloy equipment.

Key words: high temperature treatment, chemical equipment, titanium alloy, Ti-6Al-4V (TC4), electrochemical corrosion, cooling method

中图分类号:

X937

王静虹, 孟庆龙, 王仓天, 支有冉. 高温影响下化工设备钛合金的电化学腐蚀机制[J]. 中国安全科学学报, 2021, 31(1): 95-101.

WANG Jinghong, MENG Qinglong, WANG Cangtian, ZHI Youran. Electrochemical corrosion mechanism of titanium alloy in chemical equipment under influence of high temperature[J]. China Safety Science Journal, 2021, 31(1): 95-101.

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高温影响下化工设备钛合金的电化学腐蚀机制

Electrochemical corrosion mechanism of titanium alloy in chemical equipment under influence of high temperature

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