点缺陷模型在2205双相不锈钢中的应用

中国腐蚀与防护学报

2013, Vol. 33

Issue (2): 90-96

研究报告

本期目录 | 过刊浏览

点缺陷模型在2205双相不锈钢中的应用

刘佐嘉¹ 程学群¹ 李晓刚¹ 刘小辉²

1. 北京科技大学腐蚀与防护中心北京 100083;
2. 中国石油化工股份有限公司青岛安全工程研究院青岛 266071

Application of PDM (Point Defect Model) on 2205 Duplex Stainless Steel

LIU Zuojia¹, CHENG Xuequn¹, LI Xiaogang¹, LIU Xiaohui²

1. Corrosion and Protection Centre of University of Science and Technology Beijing, Beijing 100083, China;
2. China Petroleum & Chemical Corporation, Qingdao Safety Engineering Institute, SINOPEC, Qingdao 266071, China

全文: PDF(1866 KB)

摘要: 采用电化学极化曲线和电化学阻抗技术对2205双相不锈钢在0.1%、1.0%及3.5%（质量分数，%）三种不同浓度的NaCl溶液中的腐蚀性能进行测试，采用点缺陷模型(PDM)对测试结果进行建模与分析。研究结果表明，2205双相不锈钢随着溶液浓度的升高抗点蚀能力下降，这是由于在钝化膜的生长过程中，氧离子缺陷产生于金属/膜界面，消耗于膜/溶液界面，而金属离子缺陷产生于膜/溶液界面，消耗于金属/膜界面；氧离子缺陷的迁移导致钝化膜的生长，而金属离子缺陷的迁移使得钝化膜发生溶解。同时，根据PDM模型理论并从金属相角度出发对2205不锈钢建立钝化膜溶解模型，可知2205双相不锈钢奥氏体相γ上的钝化膜可能比铁素体相α优先发生溶解。

关键词 ：点缺陷模型, 钝化膜, 阳极成膜电位, 2205双相不锈钢

Abstract：The corrosion behavior of 2205 duplex stainless steel in 0.1%, 1.0% and 3.5% (mass%) NaCl solution by electrochemical measurements was investigated, respectively. The experimental analysis based on PDM (point defect model) shows that the pitting corrosion resistance of the material tends to be worse with the increasing of concentration of NaCl solution. When the passive film forms, oxygen ion vacancy is produced on metal/film interface and consumed on film/solution interface, however metal ion vacancy exists on film/solution interface and being consumed on metal/film interface. Migration of oxygen ion vacancy causes the growth of the passive film but it also destroys the film simultaneously. In addition, on the basis of PDM theory, a dissolution model of passive film has been established. The model explains that the passive film of 2205DSS on austenite γ phase probably dissolves faster than on ferrite α phase in the simulated marine environment.

Key words： PDM (point defect model) passive film anodic formation potential 2205 duplex stainless steel

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引用本文:

刘佐嘉程学群李晓刚刘小辉. 点缺陷模型在2205双相不锈钢中的应用[J]. 中国腐蚀与防护学报, 2013, 33(2): 90-96.
. Application of PDM (Point Defect Model) on 2205 Duplex Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2013, 33(2): 90-96.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2013/V33/I2/90

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