CoCrFeMnNi高熵合金和管线钢在碱性土壤环境中的耐蚀性对比研究

doi:10.11902/1005.4537.2021.161

中国腐蚀与防护学报

2022, Vol. 42

Issue (3): 425-434 DOI: 10.11902/1005.4537.2021.161

中国腐蚀与防护学会杰出青年学术成就奖论文专栏

本期目录 | 过刊浏览

CoCrFeMnNi高熵合金和管线钢在碱性土壤环境中的耐蚀性对比研究

赵宝珠, 朱敏(

), 袁永锋, 郭绍义, 尹思敏

浙江理工大学机械与自动控制学院杭州 310018

Comparison of Corrosion Resistance of CoCrFeMnNi High Entropy Alloys with Pipeline Steels in an Artificial Alkaline Soil Solution

ZHAO Baozhu, ZHU Min(

), YUAN Yongfeng, GUO Shaoyi, YIN Simin

School of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou 310018, China

全文: PDF(11429 KB) HTML

摘要:

采用电化学技术、X射线光电子能谱、原子力显微镜测试和浸泡实验研究了有/无热处理的等原子比CoCrFeMnNi高熵合金和管线钢在碱性土壤模拟溶液中的耐蚀性差异。结果表明：高熵合金呈现出局部腐蚀特征，腐蚀形态为零星分布的针孔状点蚀，而X80和X100管线钢表面发生了全面腐蚀，并有大尺寸腐蚀坑存在。高熵合金热处理后在碱性土壤模拟溶液中形成的钝化膜结构致密稳定，含有较多Cr的氧化物和水以及更少的FeO，有利于其钝化膜的保护性；而管线钢钝化膜薄且含有缺陷，对基体的保护性较差。有/无热处理高熵合金的耐蚀性均优于X80和X100管线钢，且热处理可提升高熵合金的耐蚀性能。

关键词 ：高熵合金, 管线钢, 耐蚀性, 点蚀, 钝化膜

Abstract：

The difference in the corrosion resistance between the as-cast and heat treated equiatomic CoCrFeMnNi high entropy alloy (HEA) and hot rolled X80 and X100 pipeline steels in a simulated alkaline soil solution was investigated by immersion test, electrochemical tests, XPS and AFM. The results show that the high entropy alloy exhibits the characteristics of local corrosion, and few pits are sporadically distributed on its surface, while X80 and X100 pipeline steels display the characteristics of severe general corrosion, with large size corrosion pits. Moreover, the passive film of HEA is compact and stable, and contains more Cr oxide, bound water and less FeO, which is conducive to increasing its corrosion resistance, whereas the passive film of pipeline steel is thinner and defective, and has poor protective ability. The corrosion resistance of the HEA before and after heat treatment is all better than those of X80 and X100 pipeline steels, and the corrosion resistance of the HEA can be further improved by heat treatment.

Key words： HEA pipeline steel corrosion resistance pitting corrosion passive film

收稿日期: 2021-07-13

ZTFLH:

TG142

基金资助:浙江省自然科学基金(LY18E010004);国家市场监督管理总局科技计划项目(2019MK134)

通讯作者: 朱敏 E-mail: zmii2009@163.com

Corresponding author: ZHU Min E-mail: zmii2009@163.com

作者简介: 赵宝珠，男，1996年生，硕士生

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引用本文:

赵宝珠, 朱敏, 袁永锋, 郭绍义, 尹思敏. CoCrFeMnNi高熵合金和管线钢在碱性土壤环境中的耐蚀性对比研究[J]. 中国腐蚀与防护学报, 2022, 42(3): 425-434.
Baozhu ZHAO, Min ZHU, Yongfeng YUAN, Shaoyi GUO, Simin YIN. Comparison of Corrosion Resistance of CoCrFeMnNi High Entropy Alloys with Pipeline Steels in an Artificial Alkaline Soil Solution. Journal of Chinese Society for Corrosion and protection, 2022, 42(3): 425-434.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.161 或 https://www.jcscp.org/CN/Y2022/V42/I3/425

图1 铸态和热处理后的HEA及管线钢的微观组织

图2 铸态和热处理后HEA的XRD图谱

图3 HEA和管线钢在Na2CO3/NaHCO3溶液中的开路电位

图4 HEA和管线钢在Na2CO3/NaHCO3溶液中的动电位极化曲线及拟合的Ip和Ecorr

图5 HEA和管线钢在碱性土壤模拟溶液中的EIS图谱

图6 EIS数据的拟合电路

表1 电化学阻抗谱拟合结果

图7 HEA和管线钢在碱性土壤模拟溶液中形成钝化膜的Mott-Schottky曲线载流子浓度及钝化膜厚度

图8 HEA和管线钢钝化膜的2D、3D形貌以及截线图

图9 有无热处理HEA表面钝化膜的XPS图谱

图10 有无热处理HEA的钝化膜组成比例

图11 HEA和管线钢在碱性土壤模拟溶液中的表面腐蚀形貌

图12 HEA和管线钢在碱性土壤模拟溶液中的平均腐蚀速率

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