模拟海水溶液中Fe<sup>3+</sup>对不锈钢点蚀的影响

doi:10.11902/1005.4537.2019.145

中国腐蚀与防护学报

2020, Vol. 40

Issue (6): 517-522 DOI: 10.11902/1005.4537.2019.145

研究报告

本期目录 | 过刊浏览

模拟海水溶液中Fe³⁺对不锈钢点蚀的影响

张浩, 杜楠(

), 周文杰, 王帅星, 赵晴

南昌航空大学轻合金加工科学与技术国防重点学科实验室南昌 330063

Effect of Fe³⁺ on Pitting Corrosion of Stainless Steel in Simulated Seawater

ZHANG Hao, DU Nan(

), ZHOU Wenjie, WANG Shuaixing, ZHAO Qing

National Defense Key Discipline Laboratory of Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China

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摘要:

采用线性扫描伏安法和循环伏安法研究了304不锈钢在FeCl₃酸性溶液中的腐蚀行为。结果表明：相同pH及Cl^-浓度下，随着Fe³⁺浓度增加，304不锈钢自腐蚀电位正移，自腐蚀电流密度增加。304不锈钢在酸性Fe³⁺溶液中发生腐蚀时，由于Fe³⁺还原反应的存在导致不锈钢自腐蚀电位正移，从而使电极表面H⁺还原反应难以进行；当Fe³⁺含量充足时，不锈钢腐蚀过程中阴极反应主要为Fe³⁺还原反应，而不是H⁺去极化反应。因此在研究不锈钢点蚀行为时，要充分考虑到蚀孔周围Fe³⁺的作用。

关键词 ： 304不锈钢, 点蚀, 循环伏安曲线, 动电位极化, Fe³⁺还原

Abstract：

The corrosion behavior of 304 stainless steel in acidic FeCl₃ solution was studied by linear sweep voltammetry and cyclic voltammetry. The results show that the free-corrosion potential of 304 stainless steel shifts positively and the free-corrosion current density increases with the increase of Fe³⁺ concentration at the same pH and Cl^- concentration. When 304 stainless steel is corroded in acidic Fe³⁺ solution, the free-corrosion potential of stainless steel is positively shifted due to the presence of Fe³⁺ reduction reaction, which makes it difficult for H⁺ reduction reaction to carry out on the electrode surface. When Fe³⁺ content is sufficient, the cathodic reaction in stainless steel corrosion process is mainly Fe³⁺ reduction reaction, not H⁺depolarization reaction. Therefore, it should be fully considered the effect of Fe³⁺ on pits growth in the study of pitting corrosion behavior of stainless steel.

Key words： 304 stainless steel pitting corrosion cyclic voltammetry linear sweep voltammetry Fe³⁺ reduction reaction

收稿日期: 2019-09-10

ZTFLH:

TG174

基金资助:国家自然科学基金(51561024)

通讯作者: 杜楠 E-mail: d_nan@sina.com

Corresponding author: DU Nan E-mail: d_nan@sina.com

作者简介: 张浩，男，1995年生，硕士生

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引用本文:

张浩, 杜楠, 周文杰, 王帅星, 赵晴. 模拟海水溶液中Fe³⁺对不锈钢点蚀的影响[J]. 中国腐蚀与防护学报, 2020, 40(6): 517-522.
Hao ZHANG, Nan DU, Wenjie ZHOU, Shuaixing WANG, Qing ZHAO. Effect of Fe³⁺ on Pitting Corrosion of Stainless Steel in Simulated Seawater. Journal of Chinese Society for Corrosion and protection, 2020, 40(6): 517-522.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.145 或 https://www.jcscp.org/CN/Y2020/V40/I6/517

表1 腐蚀溶液的成分与pH

图1 304不锈钢在不同浓度Fe3+溶液中的动电位极化曲线 (pH=1.64，CCl-=0.3 mol/L)

$C F e 3 +$ / mol/L	E_corr / mV	I_corr / μA·cm^-2
0.001	-329.1	0.42
0.010	-119.1	0.73
0.025	-65.4	1.79
0.100	65.5	14.91

表2 304不锈钢在不同浓度Fe3+溶液中的动电位极化曲线拟合结果

图2 304不锈钢在不同浓度Fe3+溶液中极化后的腐蚀形貌

图3 玻碳电极在0.100 mol/L FeCl3溶液中的循环伏安曲线

图4 304不锈钢在0.100 mol/L FeCl3溶液和0.100 mol/L FeCl2溶液中的动电位极化曲线

图5 蚀孔生长示意图

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