无取向电工钢用磷酸盐系绝缘环保涂层的研制及性能研究

doi:10.11902/1005.4537.2021.250

中国腐蚀与防护学报

2022, Vol. 42

Issue (5): 805-812 DOI: 10.11902/1005.4537.2021.250

海洋材料腐蚀与防护专栏

本期目录 | 过刊浏览

无取向电工钢用磷酸盐系绝缘环保涂层的研制及性能研究

胡雄鑫¹, 张弦¹(

), 刘静¹, 吴开明¹(

), 林安²

^1.武汉科技大学耐火材料与冶金省部共建国家重点实验室高性能钢铁材料及其应用省部共建协同创新中心冶金工业过程系统科学湖北省重点实验室武汉 430081
^2.武汉大学资源与环境科学学院武汉 430072

Development and Performance of Phosphate-based Protective Insulation Coating for Non-oriented Electrical Steel

HU Xiongxin¹, ZHANG Xian¹(

), LIU Jing¹, WU Kaiming¹(

), LIN An²

^1.Hubei Province Key Laboratory of Systems Science in Metallurgical Process, Collaborative Innovation Center for Advanced Steels, The State Key Laboratory of Refractory Material and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
^2.School of Resource and Environmental Science, Wuhan University, Wuhan 430072, China

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摘要:

以磷酸盐为基础成膜剂,添加稀土钝化剂与硅烷偶联剂,研制了一种无取向电工钢用绝缘环保涂料,对添加不同助剂的涂层的显微形貌、电化学性能、成分组成和盐雾性能进行了表征和测试。结果表明,在成膜剂中添加稀土钝化剂可有效填补涂层中的孔洞,进一步添加硅烷偶联剂可分散稀土盐沉淀,使复合涂层表面更均匀且无明显缺陷。电化学测试结果显示复合涂层的腐蚀电流密度最小,极化电阻值最大,结合盐雾测试结果表明其具有出色的耐腐蚀性能。此外,复合涂层的层间电阻、附着力及铅笔硬度等性能均优于工业标准。

关键词 ：电工钢, 磷酸盐涂层, 稀土, 硅烷, 耐腐蚀性能

Abstract：

A protective insulation coating for non-oriented electrical steel plate was developed with phosphate-based film forming agent, rare earth passivator and silane coupling agent as raw material. The microstructure, composition, electrochemical performance and resistance to salt spray testing of the coatings with different additives were characterized and assessed. The results show that adding rare earth passivator to the film forming agent can effectively fill the pores on the surface of coating. While the addition of silane coupling agent may be beneficial to the dispersive distribution the rare earth salt precipitates, thereby, resulting in a more uniform surface without obvious defects of the composite coating. The electrochemical test results show that the composite coating presents lower corrosion current density and larger polarization resistance. Taking the salt spray test results into consideration, it is evident that the composite coating has excellent corrosion resistance. In addition, the properties of the composite coating, such as interlayer resistance, adhesion, and pencil hardness are all higher than the requirements of the relevant industrial standards.

Key words： electrical steel phosphate coating rare earth silane corrosion resistance

收稿日期: 2021-09-22

ZTFLH:

TG174

基金资助:国家自然科学基金(51601138);国家自然科学基金(51601137)

通讯作者: 张弦,吴开明 E-mail: xianzhang@wust.edu.cn;wukaiming@wust.edu.cn

Corresponding author: ZHANG Xian,WU Kaiming E-mail: xianzhang@wust.edu.cn;wukaiming@wust.edu.cn

作者简介: 胡雄鑫,男,1995年生,硕士生

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引用本文:

胡雄鑫, 张弦, 刘静, 吴开明, 林安. 无取向电工钢用磷酸盐系绝缘环保涂层的研制及性能研究[J]. 中国腐蚀与防护学报, 2022, 42(5): 805-812.
Xiongxin HU, Xian ZHANG, Jing LIU, Kaiming WU, An LIN. Development and Performance of Phosphate-based Protective Insulation Coating for Non-oriented Electrical Steel. Journal of Chinese Society for Corrosion and protection, 2022, 42(5): 805-812.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.250 或 https://www.jcscp.org/CN/Y2022/V42/I5/805

图1 4种涂层样品的SEM表面形貌图

图2 涂层样品的截面形貌与能谱图

图3 4种涂层样品的拉曼光谱

图4 4种涂层样品的XPS图谱

图5 4种涂层样品和裸钢的动电位极化曲线图

表1 4种涂层样品和裸钢的腐蚀电流密度与腐蚀电位

图6 4种涂层样品的电化学阻抗谱

图7 拟合电化学阻抗谱的等效电路图

图8 4种涂层样品的拟合Rp值随时间变化图

图9 4种涂层样品和裸钢在8 h中性盐雾实验后的腐蚀形貌

表2 D样品的综合性能测试

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