海洋大气环境Cu/Ni协同作用对低合金钢耐蚀性影响

doi:10.11902/1005.4537.2018.165

中国腐蚀与防护学报

2019, Vol. 39

Issue (6): 511-518 DOI: 10.11902/1005.4537.2018.165

研究报告

本期目录 | 过刊浏览

海洋大气环境Cu/Ni协同作用对低合金钢耐蚀性影响

张天翼¹,柳伟¹(

),范玥铭¹,李世民¹,董宝军¹,BANTHUKUL Wongpat¹,CHOWWANONTHAPUNYA Thee²

1. 北京科技大学新材料技术研究院腐蚀与防护中心北京 100083
2. Faculty of International Maritime Studies, Kasetsart University, Sriracha, Chonburi 20230, Thailand

Effect of Synergistic Action of Cu/Ni on Corrosion Resistance of Low Alloy Steel in a Simulated Tropical Marine Atmosphere

ZHANG Tianyi¹,LIU Wei¹(

),FAN Yueming¹,LI Shimin¹,DONG Baojun¹,BANTHUKUL Wongpat¹,CHOWWANONTHAPUNYA Thee²

1. Corrosion and Protection Center, Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
2. Faculty of International Maritime Studies, Kasetsart University, Sriracha, Chonburi 20230, Thailand

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摘要:

通过模拟严苛热带海洋大气环境的室内喷淋加速实验，研究了Cu/Ni协同作用对低合金钢的腐蚀速率及锈层形貌、成分的影响，测试3种合金试样在0.5% (质量分数) NaCl溶液中的电化学阻抗及线性极化曲线。结果表明，随着Cu、Ni含量的提高，钢材在喷淋实验下生成的锈层逐渐变薄且致密，同时Cu在锈层的富集作用阻碍了Cl^-入侵。Cu、Ni两种元素在一定程度上提高了基体金属溶解反应的电荷转移电阻 (R_t) 及极化电阻，加速了保护性锈层的形成并从阳极电化学反应抑制作用上提高了锈层的保护性。

关键词 ：耐蚀钢, 热带海洋大气, 腐蚀, 协同作用, 极化电阻

Abstract：

The effect of synergistic action of Cu and Ni on corrosion rate, morphology and composition of the rust formed on three low alloy steels with different contents of Cu and Ni was studied via indoor spray acceleration tests, aiming to simulate the harsh tropical marine atmosphere. Meanwhile, electrochemical impedance spectroscopy (EIS) and linear polarization tests for the three steels were also carried out in 0.5% (mass fraction) NaCl solution. The results show that with the increase of Cu- and Ni-content, the rust layer formed on the steels subjected to spraying test becomes gradually thinner and denser, and the enrichment of Cu in the rust layer mitigates the invasion of Cl^-. The charge transfers resistance (R_t) and polarization resistance of the metal dissolution reaction were increased to some extent by the synergistic effect of two elements of Cu and Ni, which accelerated the formation and enhanced the protectiveness of the rust layer through inhibiting the anodic electrochemical reaction.

Key words： corrosion resistant steel tropical marine atmospheric environment corrosion synergistic action polarization resistance

收稿日期: 2018-11-09

ZTFLH:

TG172

基金资助:国家重点研发计划(2016YFE0203600);国家自然科学基金(51571027)

通讯作者: 柳伟 E-mail: weiliu@ustb.edu.cn

Corresponding author: Wei LIU E-mail: weiliu@ustb.edu.cn

作者简介: 张天翼，男，1993年生，博士生

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引用本文:

张天翼,柳伟,范玥铭,李世民,董宝军,BANTHUKUL Wongpat,CHOWWANONTHAPUNYA Thee. 海洋大气环境Cu/Ni协同作用对低合金钢耐蚀性影响[J]. 中国腐蚀与防护学报, 2019, 39(6): 511-518.
Tianyi ZHANG, Wei LIU, Yueming FAN, Shimin LI, Baojun DONG, Wongpat BANTHUKUL, Thee CHOWWANONTHAPUNYA. Effect of Synergistic Action of Cu/Ni on Corrosion Resistance of Low Alloy Steel in a Simulated Tropical Marine Atmosphere. Journal of Chinese Society for Corrosion and protection, 2019, 39(6): 511-518.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2018.165 或 https://www.jcscp.org/CN/Y2019/V39/I6/511

表1 实验用钢的化学成分 (mass fraction / %)

图1 3种钢的金相显微组织

图2 室内喷淋实验腐蚀速率

图3 3种钢喷淋实验240 h后的锈层和除去锈层后的宏观形貌

图4 喷淋实验240 h后3种钢锈层表面形貌

图5 3种钢腐蚀240 h后锈层截面形貌及元素分布结果

图6 裸钢电化学阻抗谱及等效电路图

表2 3种裸钢EIS拟合的电化学参数

图7 喷淋实验240 h后带锈试样电化学阻抗谱及等效电路图

表3 喷淋实验240 h后带锈试样EIS拟合值

图8 裸钢及喷淋实验240 h后带锈钢的线性极化曲线

表4 线性极化曲线电化学参数值

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