引用本文:贺星,孔德军,宋仁国.液氮辅助冷却激光熔覆Al基非晶涂层的组织与耐蚀性[J].中国表面工程,2018,31(4):148~159
HE Xing,KONG De-jun,SONG Ren-guo.Microstructure and Corrosion Resistance of Al-based Amorphous Coatings Prepared by Laser Cladding Combined with Liquid Nitrogen-assisted Cooling[J].China Surface Engineering,2018,31(4):148~159
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液氮辅助冷却激光熔覆Al基非晶涂层的组织与耐蚀性
贺星1,2, 孔德军2,3, 宋仁国1,2
1.常州大学 材料科学与工程学院, 江苏 常州 213164;2.常州大学 江苏省材料表面科学与技术重点实验室, 江苏 常州 213164;3.常州大学 机械工程学院, 江苏 常州 213164
摘要:
采用激光熔覆加液氮辅助冷却技术在S355海洋钢表面制备Al基非晶涂层，运用SEM、XRD、电化学工作站等技术分析了涂层腐蚀前后表界面形貌及物相组成，研究了液氮辅助冷却对涂层性能的影响以及涂层在5% NaCl溶液中浸泡10、20、40和80 d后的腐蚀性能。结果表明：经过液氮辅助冷却后涂层中存在少量的非晶AlFeNi相；涂层与基体形成了良好的冶金结合；表面组织细小，增强相TiC均匀弥散分布，且裂纹气孔较少。涂层表面显微硬度增加15%；残余应力与自然冷却时基本持平，均为拉应力；其耐蚀性也得到了显著提升。
关键词:  激光熔覆  液氮辅助冷却  Al基非晶涂层  耐蚀性能
DOI：10.11933/j.issn.1007-9289.20180109002
分类号:TG174.44
基金项目:江苏省重点研发计划资助项目（BE2016052）
Microstructure and Corrosion Resistance of Al-based Amorphous Coatings Prepared by Laser Cladding Combined with Liquid Nitrogen-assisted Cooling
HE Xing1,2, KONG De-jun2,3, SONG Ren-guo1,2
1.School of Materials Science and Engineering, Changzhou University, Changzhou 213164, Jiangsu;2.Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164, Jiangsu;3.School of Mechanical Engineering, Changzhou University, Changzhou 213164, Jiangsu
Abstract:
Al-based amorphous coatings were prepared by laser cladding combined with liquid nitrogen-assisted cooling technique on the surface of S355 offshore steel. The surface-interface morphologies, chemical element distribution, phase compositions and the effects of liquid nitrogen-assisted cooling on the properties of the as-prepared coatings were analyzed by using SEM, XRD and electrochemical workstation. The corrosion behaviors of the coatings and substrate immersed in 5% NaCl solution for 10, 20, 40 and 80 days were also investigated. Results show that there exist a small amount of amorphous AlFeNi phases in the coatings after liquid nitrogen-assisted cooling. A good metallurgical bonding between the coating and the substrate is formed. On the surface of the coating, the microstructure of the coating is fine with reinforces phase TiC uniformly dispersed. The cracks and pores are less in the coating as well. The micro hardness of the coating surface increases by 15%. The residual stress in the coatings prepared by laser cladding combined with liquid nitrogen-assisted cooling is basically the same as the coatings prepared by only laser cladding, both of which are tensile stress. The corrosion resistance of the coating is also significantly improved.
Key words:  laser cladding  liquid nitrogen-assisted cooling  Al-based amorphous coating  corrosion resistance
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