高含Cl-环境下pH 值对904L 不锈钢腐蚀行为的影响

张 红, 李元隆, 王 杰, 金 杰, 樊学华, 杨 蒙

doi:10.16577/j.issn.1001-1560.2023.0164

材料保护 >

2023 , Vol. 56 >Issue 7: 77 - 82

DOI: https://doi.org/10.16577/j.issn.1001-1560.2023.0164

试验研究

高含Cl-环境下pH 值对904L 不锈钢腐蚀行为的影响

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1.中国石油工程建设有限公司北京设计分公司，北京 100085；2.中国石油国际事业有限公司加拿大分公司，北京 100032；3.北京科技大学新材料技术研究院，北京 100083

金杰，硕士研究生，主要研究方向为耐蚀合金腐蚀，电话:15189805539，E-mail: jinjiebk＠126.com

收稿日期: 2023-02-22

修回日期: 2023-03-12

录用日期: 2023-04-15

网络出版日期: 2023-08-23

基金资助

中国石油天然气股份有限公司科学研究与技术开发项目(2021ZZ01-01)；中国石油工程建设有限公司科技项目(CPECC2019KJ12)资助

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Effect of pH value on the Corrosion Behavior of 904L Stainless Steel Under High Cl- Concentration Environment

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1.China Petroleum Engineering ＆ Construction Corp.，Beijing Company，Beijing 100085，China；2.PetroChina International Co.，Ltd.，Canada Branch，Beijing 100032，China；3.Institute for Advanced Materials and Technology，University of Science and Technology Beijing，Beijing 100083，China

Received date: 2023-02-22

Revised date: 2023-03-12

Accepted date: 2023-04-15

Online published: 2023-08-23

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摘要

为了获得904L 不锈钢在高含Cl-不同pH 值环境下的耐蚀性能，通过循环极化曲线、电化学阻抗谱、奥林巴斯共聚焦显微镜、扫描电子显微镜(SEM)及能谱分析(EDS)研究了904L 奥氏体不锈钢在不同pH 值的100 g/L NaCl 溶液中的腐蚀行为。结果表明:904L 不锈钢的耐蚀性随着pH 值的升高而提高，EIS 由2 个容抗弧组成，容抗弧半径随着pH 值升高而增大，且容抗均在一个数量级；较低的pH 值条件能够增强Cl-对钝化膜的破坏性，随着pH 值的降低，材料的钝化区范围降低，当pH＝2 时，材料表面出现轻微点蚀。

关键词： 904L 不锈钢; pH 值; Cl-; 腐蚀行为

本文引用格式

张红, 李元隆, 王杰, 金杰, 樊学华, 杨蒙 . 高含Cl-环境下pH 值对904L 不锈钢腐蚀行为的影响[J]. 材料保护, 2023 , 56(7) : 77 -82 . DOI: 10.16577/j.issn.1001-1560.2023.0164

Abstract

For improving the corrosion resistance of 904L stainless steel under high Cl- concentration environment with different pH values condition，the corrosion behavior of 904L austenitic stainless steel in 100 g/L NaCl solution at different pH values was studied by cyclic polarization curves，electrochemical impedance spectroscopy，Olympus confocal microscopy，scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS).Results showed that the corrosion resistance of 904L stainless steel increased with the increase of pH value，EIS consisted of two capacitive reactance arcs，and the radius of capacitive reactance arc increased with the increase of pH value，and the capacitive reactances were all in the same order of magnitude.Meanwhile，lower pH value conditions could enhance the destructive effect of Cl- on the passive film.With the decrease of pH value，the range of passive region of the material decreased.When the pH＝2，slight pitting occurred on the surface of the material.

Key words： 904L stainless steel; pH value; Cl-; corrosion behavior

参考文献

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