等离子喷涂FeCrMoCBY铁基非晶涂层耐蚀性研究

doi:10.11902/1005.4537.2020.219

中国腐蚀与防护学报

2021, Vol. 41

Issue (5): 717-720 DOI: 10.11902/1005.4537.2020.219

研究报告

本期目录 | 过刊浏览

等离子喷涂FeCrMoCBY铁基非晶涂层耐蚀性研究

吴林涛, 周泽华(

), 张欣(

), 杨光恒, 张凯城, 王光宇

河海大学力学与材料学院南京 211100

Long-term Corrosion Resistance of Plasma Sprayed FeCrMoCBY Fe-based Amorphous Coating in 3.5%NaCl Solution

WU Lintao, ZHOU Zehua(

), ZHANG Xin(

), YANG Guangheng, ZHANG Kaicheng, WANG Guangyu

College of Mechanics and Materials, Hohai University, Nanjing 211100, China

全文: PDF(3920 KB) HTML

摘要:

采用等离子喷涂技术制备了FeCrMoCBY铁基非晶涂层，研究了铁基非晶涂层在3.5%NaCl溶液中浸泡不同时长后的电化学腐蚀性能和微观组织结构。结果表明，在720 h的浸泡期间，涂层的耐蚀性经历了先提高后降低的变化，在浸泡216 h时达到最优，腐蚀电流密度达到最低，为3.393×10^-5 A·cm^-2，且此时涂层的表面更加致密，没有明显孔隙。在经过720 h浸泡后，涂层仍能保持在一个相对较低的腐蚀电流密度6.970×10^-5 A·cm^-2。

关键词 ：等离子喷涂, 铁基非晶, 涂层, 耐蚀性

Abstract：

FeCrMoCBY amorphous coatings were prepared on Q235 carbon steel plates by means of plasma spraying technique. Then, the electrochemical corrosion resistance and microstructure of the coatings after immersion in 3.5%NaCl for different periods were characterized. The results showed that the corrosion resistance of the coatings increased at first and then decreased during the period of 720 h immersion. After 216 h immersion, the corrosion resistance of the coatings achieved the optimal, while the corrosion current density of the coatings reached the minimum 3.393×10^-5 A·cm^-2; the coating surface seemed much compact, while no apparent defects can be seen. The main reason is that the corrosion products piled up in the defects. What's more, it's found that Cr concentrated in corrosion products, which meant that the passivation of Cr may play a key role in the improvement of corrosion resistance for the coating. In addition, the coating can still maintain a relatively low corrosion current density after 720 h immersion, which is 6.970×10^-5 A·cm^-2.

Key words： plasma spraying technique Fe-based amorphous coating corrosion resistance

收稿日期: 2020-11-02

ZTFLH:

TG174

基金资助:国家自然科学基金(51909071);中央高校基本科研业务费专项(B200202133);江苏省自然科学基金(BK20190493)

通讯作者: 周泽华,张欣 E-mail: zhouzehua@hhu.edu.cn;zhangxin.007@163.com

Corresponding author: ZHOU Zehua,ZHANG Xin E-mail: zhouzehua@hhu.edu.cn;zhangxin.007@163.com

作者简介: 张欣，E-mail：zhangxin.007@163.com，研究方向为磁场环境下金属材料腐蚀机理
吴林涛，男，1997年生，硕士生

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引用本文:

吴林涛, 周泽华, 张欣, 杨光恒, 张凯城, 王光宇. 等离子喷涂FeCrMoCBY铁基非晶涂层耐蚀性研究[J]. 中国腐蚀与防护学报, 2021, 41(5): 717-720.
Lintao WU, Zehua ZHOU, Xin ZHANG, Guangheng YANG, Kaicheng ZHANG, Guangyu WANG. Long-term Corrosion Resistance of Plasma Sprayed FeCrMoCBY Fe-based Amorphous Coating in 3.5%NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2021, 41(5): 717-720.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.219 或 https://www.jcscp.org/CN/Y2021/V41/I5/717

图1 喷涂态涂层的XRD谱

图2 喷涂态涂层截面显微形貌

图3 经过不同浸泡时长后涂层的Tafel极化曲线和EIS谱及拟合电路模型

表1 电化学腐蚀参数

图4 经过720h浸泡后涂层的XRD谱

图5 未浸泡和经过216和720 h浸泡后的涂层的显微形貌及Cr分布图

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