为提高Inconel 690合金管表面的耐蚀性和耐磨性,对合金管表面进行了激光熔凝渗氮处理,对处理后试样的微观组织、相组成、显微硬度及耐蚀性能进行了测试与分析,研究结果表明,激光氮化层主要由CrN、γ相等物相组成,氮化层具有较高冶金质量且无裂纹、气孔等缺陷,组织分布均匀、晶粒细小,显微硬度最高达到253 HV。经过激光熔凝渗氮处理后,合金管对Cl~-表现出较好的腐蚀抗性,但对OH~-的耐蚀性能轻微降低。 In order to improve the corrosion resistance and wear resistance of the Inconel 690 alloy tube surface, laser cladding nitriding treatment was performed on the surface of the alloy tube. The microstructure, phase composition, microhardness and corrosion resistance of the treated sample were investigated The results show that the laser nitride layer is mainly composed of CrN and γ phases. The nitride layer has high metallurgical quality and no cracks, pores and other defects, the microstructure is distributed evenly, the grains are fine and the microhardness is the highest Reached 253 HV. After laser cladding nitriding treatment, the alloy tube showed good corrosion resistance to Cl ~ -, but the corrosion resistance to OH ~ - slightly decreased.