<strong>IN625</strong>激光熔覆层腐蚀致微裂纹扩展机理研究

doi:10.11902/1005.4537.2023.231

中国腐蚀与防护学报

2024, Vol. 44

Issue (3): 645-657 CSTR: 32134.14.1005.4537.2023.231 DOI: 10.11902/1005.4537.2023.231

研究报告

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IN625激光熔覆层腐蚀致微裂纹扩展机理研究

邓双九, 李昌(

), 余梦辉, 韩兴

辽宁科技大学机械工程与自动化学院鞍山 114051

Prpogation Mechanism of Microcracks Caused by Corrosion of Laser Cladded In625 Coating on Nodular Cast Iron in 3.5%NaCl Solution

DENG Shuangjiu, LI Chang(

), YU Menghui, HAN Xing

School of Mechanical Engineering and Automation, University of Science and Technology of Liaoning, Anshan 114051, China

引用本文:

邓双九, 李昌, 余梦辉, 韩兴. IN625激光熔覆层腐蚀致微裂纹扩展机理研究[J]. 中国腐蚀与防护学报, 2024, 44(3): 645-657.
Shuangjiu DENG, Chang LI, Menghui YU, Xing HAN. Prpogation Mechanism of Microcracks Caused by Corrosion of Laser Cladded In625 Coating on Nodular Cast Iron in 3.5%NaCl Solution[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(3): 645-657.

全文: PDF(15485 KB) HTML

摘要:

对QT600球墨铸铁表面熔覆IN625涂层，观察熔覆层显微组织与EDS能谱。对基体与熔覆层进行3.5%NaCl溶液中的电化学腐蚀实验，建立IN625激光熔覆层腐蚀致微裂纹扩展瞬态演变数值模型，考虑微小裂纹已经存在的情况下，熔覆层在恶劣环境工作所诱发的腐蚀过程，分析离子浓度、离子迁移、pH值、电极电位和腐蚀速率等各项数值在腐蚀过程中的瞬态演变规律。结果表明，IN625熔覆层相较于QT600基体耐蚀性显著提升。

关键词 ：激光熔覆技术, IN625熔覆层, 微裂纹, 腐蚀, 电化学实验

Abstract：

IN625 coating was laser clad on the surface of QT600 nodular cast iron, and the microstructure and composition of the clad coating were characterized by means of optical microscope and scanning electron microscope with energy dispersive spectroscope. The electrochemical corrosion behavior of the IN625 clad QT600 nodular cast iron was examined in 3.5%NaCl solution. Meanwhile, a numerical model of the transient evolution of micro-crack growth induced by corrosion of IN625 laser cladding layer was established, considering the corrosion process induced by the existence of micro-cracks in the cladding layer working in a harsh environment. The transient evolution of ion concentration, ion migration, pH value, electrode potential and corrosion rate during corrosion were analyzed. The results show that the corrosion resistance of IN625 clad QT600 nodular cast iron is significantly superior to that of the bare QT600 nodular cast iron.

Key words： laser cladding technology IN625 cladding layer microcracking corrosion electrochemical experiment

收稿日期: 2023-07-26 32134.14.1005.4537.2023.231

ZTFLH:

TG171

基金资助:辽宁省应用基础研究计划(2023JH2/101300226)

通讯作者: 李昌，E-mail: lichang2323-23@163.com，研究方向为机械可靠性工程、多能场复合激光先进制造、焊接可靠性、超音速喷涂、航空轴承使役损伤机理及可靠性试验方法

Corresponding author: LI Chang, E-mail: lichang2323-23@163.com

作者简介: 邓双九，男，1999年生，硕士生

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图1 推进器支架熔覆层表面微观裂纹

图2 QT600球墨铸铁与IN625合金粉末形貌

表1 QT600球墨铸铁与IN625合金粉末元素组成 (mass fraction / %)

图3 激光熔覆技术原理图

图4 IN625激光熔覆层的断面形貌以及沿深度元素分布

图5 QT600球墨铸铁和IN625熔覆层极化曲线拟合

图6 IN625熔覆层微裂纹腐蚀示意图

图7 微观立方体示意图

图8 IN625熔覆层微裂纹腐蚀扩展网格划分图

图9 IN625熔覆层常规物理性质随温度的变化

图10 微裂纹腐蚀0~100 d 后pH变化云图

图11 不同位置数据提取线

图12 微裂纹腐蚀不同位置pH变化情况

图13 微裂纹腐蚀不同位置电极电位变化情况

图14 微裂纹腐蚀不同位置扩展速率变化情况

图15 微裂纹腐蚀不同位置深度变化曲线

图16 0~100 d Ni2+浓度变化情况

图17 0~100 d Na+浓度变化情况

图18 0~100 d Cl-浓度变化情况

图19 沿数据提取线获得不同时间离子浓度变化曲线图

图20 Ni2+迁移轨迹分析

图21 Na+迁移轨迹分析

图22 Cl-迁移轨迹分析

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