脱硝剂浓度对S2205不锈钢耐蚀性及其临界点蚀温度的影响

doi:10.11902/1005.4537.2020.146

中国腐蚀与防护学报

2021, Vol. 41

Issue (4): 529-534 DOI: 10.11902/1005.4537.2020.146

研究报告

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脱硝剂浓度对S2205不锈钢耐蚀性及其临界点蚀温度的影响

崔浩燃¹, 梁平¹(

), 史艳华¹, 杨众魁¹, 韩利²

^1.辽宁石油化工大学机械工程学院抚顺 113001
^2.远东页岩炼化有限责任公司抚顺 113001

Effect of Denitration Agent Concentration on Corrosion Resistance and Critical Pitting Temperature of S2205 Stainless Steel

CUI Haoran¹, LIANG Ping¹(

), SHI Yanhua¹, YANG Zhongkui¹, HAN Li²

^1.School of Mechanical Engineering, Liaoning Petrochemical University, Fushun 113001, China
^2.Far East Shaie Oil Refinery Co. , Ltd, Fushun 113001, China

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摘要:

采用动电位极化曲线和电化学阻抗测试研究脱硝剂NaClO₂浓度对S2205不锈钢耐蚀性能的影响，采用Mott-Schottky 曲线测试钝化膜的性能，采用恒电位极化法测定不同浓度下的临界点蚀温度 (CPT)。结果表明：随着浓度的增加耐蚀性先减小后增大；在0.4~0.6 V电位区间钝化膜内层p型半导体中难溶性的Cr³⁺氧化物转变为可溶性Cr⁶⁺氧化物，钝化膜稳定性下降，6%浓度时载流子密度最大，耐蚀性最差；浓度为3%，6%和9%对应的CPT分别为65.2，57.4和62.5 ℃。

关键词 ： S2205不锈钢, 脱硝剂, 电化学测试, 临界点蚀温度

Abstract：

The effect of denitration agent (NaClO₂) concentration on the corrosion resistance of S2205 stainless steel in denitration solutions was studied by means of potentiodynamic polarization curve, electrochemical impedance and Mott-Schottky curve measurements. Meanwhile, the variation of critical pitting temperature (CPT) with the NaClO₂ concentration was measured by potentiostatic polarization method. The results show that as the NaClO₂concentration increases, the corrosion resistance of the steel decreases first and then increases. In the potential range of 0.4~0.6 V, the insoluble Cr³⁺ oxide in the passivation film of p-type semiconducting is transformed into soluble Cr⁶⁺ oxide, as a result, which degrade the stability of the passivation film. The carrier density is the largest and the relevant corrosion resistance is the worst for the passivation film formed in the solution with 6%NaClO₂. The CPTs corresponding to the solutions containing 3%, 6%, and 9% NaClO₂were 65.2, 57.4 and 62.5 ℃, respectively.

Key words： S2205 stainless steel denitration agent electrochemical test critical pitting temperature

收稿日期: 2020-08-09

ZTFLH:

TG172.4

基金资助:辽宁省大学生创新创业训练项目(201910148057)

通讯作者: 梁平 E-mail: liangping770101@163.com

Corresponding author: LIANG Ping E-mail: liangping770101@163.com

作者简介: 崔浩燃，男，2000年生

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引用本文:

崔浩燃, 梁平, 史艳华, 杨众魁, 韩利. 脱硝剂浓度对S2205不锈钢耐蚀性及其临界点蚀温度的影响[J]. 中国腐蚀与防护学报, 2021, 41(4): 529-534.
Haoran CUI, Ping LIANG, Yanhua SHI, Zhongkui YANG, Li HAN. Effect of Denitration Agent Concentration on Corrosion Resistance and Critical Pitting Temperature of S2205 Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2021, 41(4): 529-534.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.146 或 https://www.jcscp.org/CN/Y2021/V41/I4/529

图1 S2205不锈钢在不同NaClO2浓度条件下的动电位极化曲线

表1 S2205不锈钢在不同NaClO2浓度条件下的动电位极化曲线拟合结果

图2 S2205不锈钢在不同NaClO2浓度条件下的电化学阻抗谱

图3 S2205不锈钢在NaClO2溶液中的等效电路模型

表2 S2205不锈钢在不同NaClO2浓度条件下电化学阻抗图谱的拟合结果

图4 S2205不锈钢在不同NaClO2浓度条件下的Mott-Schottky曲线

表3 S2205不锈钢在不同NaClO2浓度条件下Mott-Schottky曲线的拟合结果

图5 S2205不锈钢在不同电位区间载流子密度与NaClO2浓度的关系曲线

图6 0.5 V恒电位下，S2205不锈钢在不同NaClO2浓度条件下的CPT曲线

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