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电磁搅拌辅助激光熔覆钴基合金涂层的抗热腐蚀性能

Thermal Corrosion Resistance of Co-Based Alloy Coatings by Laser Cladding Assisted by Electromagnetic Stirring

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摘要

在激光熔覆制备钴基合金涂层的过程中引入电磁搅拌, 研究了有无磁场辅助时涂层表面在750 ℃/100 h混合盐条件下的抗热腐蚀性能。研究结果表明, 无磁场辅助的涂层的抗热腐蚀性能较差, 热腐蚀60 h后涂层内部出现严重的内氧化和内硫化, 并出现严重失重现象。经磁场辅助的熔覆层形成了稳定性好的保护性Cr2O3及CoCr2O4尖晶石氧化膜, 有效抑制了腐蚀液中S和Cl-的向内侵入, 在整个腐蚀阶段样品未出现严重开裂剥落现象。电磁搅拌的加入有效细化并均化了熔覆层的显微组织, 促进了涂层表面保护性氧化膜的快速形成, 阻止了熔盐的扩散, 可进一步提高涂层的抗热腐蚀性能。

Abstract

Electromagnetic stirring technique is introduced into the processing of laser cladding for preparing Co-based alloy coatings. In this research, a detailed analysis of hot corrosion resistance is conducted for a cladding layer applied in a salt mixture at 750 ℃ for 100 h with and without the assistance of electromagnetic stirring. The cladding layer is found to have poor hot corrosion resistance without magnetic field assistance. After hot corrosion for 60 h, the inside of the coating shows severe internal oxidation and vulcanization as well as substantial weight loss. In contrast, electromagnetic stirring produces a cladding layer that effectively suppresses the inward intrusion of S and Cl- ions in the etching solution. This suppression facilitates the formation of stable protective Cr2O3 and CoCr2O4 spinel oxide films so that only slight cracking and peeling occur during the entire hot corrosion stage. The addition of electromagnetic stirring effectively refines and homogenizes the microstructure of the coating, and also promotes the rapid formation of a protective oxide film on the coating surface, which can prevent the diffusion of molten salt; thus, the hot corrosion resistance of the coating can be further improved.

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中图分类号:TN249

DOI:10.3788/aos201939.0114002

所属栏目:激光器与激光光学

基金项目:国家自然科学基金(5187052229)、国家重点研发计划(2017YFB1103603)、江苏省普通高校学术学位研究生科研创新计划(KYZZ16_0330)、江苏省六大人才高峰资助项目(GDZB-075)、常州信息职业技术学院科研平台项目(cxpt201702s)

收稿日期:2018-07-27

修改稿日期:2018-08-14

网络出版日期:2018-08-28

作者单位    点击查看

徐家乐:江苏大学机械工程学院, 江苏 镇江 212013
周建忠:江苏大学机械工程学院, 江苏 镇江 212013
谭文胜:常州信息职业技术学院机电工程学院, 江苏 常州 213164
黄舒:江苏大学机械工程学院, 江苏 镇江 212013
孟宪凯:江苏大学机械工程学院, 江苏 镇江 212013
何文渊:江苏大学机械工程学院, 江苏 镇江 212013

联系人作者:周建忠(Zhoujz@ujs.edu.cn); 徐家乐(xujiale1989@sina.com);

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引用该论文

Xu Jiale,Zhou Jianzhong,Tan Wensheng,Huang Shu,Meng Xiankai,He Wenyuan. Thermal Corrosion Resistance of Co-Based Alloy Coatings by Laser Cladding Assisted by Electromagnetic Stirring[J]. Acta Optica Sinica, 2019, 39(1): 0114002

徐家乐,周建忠,谭文胜,黄舒,孟宪凯,何文渊. 电磁搅拌辅助激光熔覆钴基合金涂层的抗热腐蚀性能[J]. 光学学报, 2019, 39(1): 0114002

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