激光熔覆FeCoCrNiMoBSi高熵合金涂层的电化学腐蚀行为

doi:10.13251/j.issn.0254-6051.2024.08.044

金属热处理 ›› 2024, Vol. 49 ›› Issue (8): 261-267.DOI: 10.13251/j.issn.0254-6051.2024.08.044

激光熔覆FeCoCrNiMoBSi高熵合金涂层的电化学腐蚀行为

杜新宇¹, 翟长生^1,2, 荣海松¹, 解芳¹, 郑红星³, 张玺¹, 张欣¹, 刘刚¹

1.南阳理工学院智能制造学院, 河南南阳 473004;
2.岩柏增材智造(徐州)科技有限公司, 江苏徐州 221116;
3.上海大学材料科学与工程学院, 上海 200444

收稿日期:2024-03-08 修回日期:2024-06-26 出版日期:2024-08-25 发布日期:2024-09-27
通讯作者: 翟长生,博士,E-mail:drzhai888@126.com
作者简介:杜新宇(1968—),男,教授,硕士,主要研究方向为增材制造及机械设计仿真等,E-mail:dxy68310@126.com。
基金资助:
国家自然科学基金(51605230,52371033);河南省重点研发与推广专项(科技攻关)(232102221022);河南省高等学校重点科研项目(21A460021)

Electrochemical corrosion behavior of FeCoCrNiMoBSi high-entropy alloy coating prepared by laser cladding

Du Xinyu¹, Zhai Changsheng^1,2, Rong Haisong¹, Xie Fang¹, Zheng Hongxing³, Zhang Xi¹, Zhang Xin¹, Liu Gang¹

1. Institute of Intelligent Manufacturing, Nanyang Institute of Technology, Nanyang Henan 473004, China;
2. Yanbai Intelligent Additive Manufacturing (Xuzhou) Technology Co., Ltd., Xuzhou Jiangsu 221116, China;
3. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China

Received:2024-03-08 Revised:2024-06-26 Online:2024-08-25 Published:2024-09-27

摘要/Abstract

摘要： 研究了316L不锈钢基体表面制备的FeCoCrNiMoBSi高熵合金激光熔覆层的微观结构以及其在H₂SO₄溶液中的电化学腐蚀和浸泡腐蚀性能。激光熔覆制备的高熵合金涂层呈现双层结构,包括底部的柱状晶和顶部的等轴晶。在0.3 mol/L的H₂SO₄溶液中,高熵合金涂层的自腐蚀电位为0.091 V,自腐蚀电流密度为11.499 μA/cm²,极化阻抗为9839.90 Ω,分别为316L不锈钢的2.12倍、6.17%和12.2倍,高熵合金涂层表现出更大的容抗弧半径和阻抗模值。此外,在浓度为50%的H₂SO₄溶液中,高熵合金涂层的腐蚀速率较低,约为0.098 mg/(dm²·d);316L不锈钢基体表现出明显的非均匀腐蚀,而高熵合金涂层腐蚀表面整体平坦,具有均匀的腐蚀速率。综合结果显示,FeCoCrNiMoBSi高熵合金激光熔覆层的耐腐蚀性能明显优于316L不锈钢基体。

关键词: 高熵合金涂层, 激光熔覆, 电化学腐蚀

Abstract: FeCoCrNiMoBSi high-entropy alloy (HEA) coating was fabricated on the 316L stainless steel substrate via laser cladding. The microstructure, electrochemical corrosion and immersion corrosion properties of the HEA coating in H₂SO₄ solution were investigated. The results show that the laser clad HEA coating exhibits a bilayer structure, consisting of a columnar crystal at the bottom and an equiaxed crystal at the top. In the 0.3 mol/L H₂SO₄ solution, the self-corrosion potential, self-corrosion current density and polarization resistance of the HEA coating are 0.091 V, 11.499 μA/cm² and 9839.90 Ω, which are 2.12 times, 6.17% and 12.2 times, respectively, of the 316L stainless steel substrate. The HEA coating exhibits larger capacitance arc radius and impedance modulus value. Additionally, in the 50% H₂SO₄ solution, the corrosion rate of the HEA coating is lower, approximately 0.098 mg/(dm²·d), 316L stainless steel substrate shows conspicuous heterogeneous corrosion, whereas the corrosion surface of the HEA coating remains uniformly flat, showing homogeneous corrosion rate. The comprehensive results show that the corrosion resistance of the FeCoCrNiMoBSi high-entropy alloy coating on the 316L stainless steel substrate is significantly better than that of the substrate itself.

Key words: high-entropy alloy coating, laser cladding, electrochemical corrosion

中图分类号:

TG142.1

杜新宇, 翟长生, 荣海松, 解芳, 郑红星, 张玺, 张欣, 刘刚. 激光熔覆FeCoCrNiMoBSi高熵合金涂层的电化学腐蚀行为[J]. 金属热处理, 2024, 49(8): 261-267.

Du Xinyu, Zhai Changsheng, Rong Haisong, Xie Fang, Zheng Hongxing, Zhang Xi, Zhang Xin, Liu Gang. Electrochemical corrosion behavior of FeCoCrNiMoBSi high-entropy alloy coating prepared by laser cladding[J]. Heat Treatment of Metals, 2024, 49(8): 261-267.

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激光熔覆FeCoCrNiMoBSi高熵合金涂层的电化学腐蚀行为

Electrochemical corrosion behavior of FeCoCrNiMoBSi high-entropy alloy coating prepared by laser cladding

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