中国激光, 2018, 45 (9): 0902004, 网络出版: 2018-09-08
激光冲击层数和氯离子浓度对AM50镁合金耐腐蚀性能的影响
Effects of Laser Shock Layer Number and Cl- Concentration on Anticorrosion Behaviors of AM50 Mg Alloys
激光技术 激光冲击强化 AM50镁合金 应力腐蚀 氯离子浓度 残余压应力 laser technique laser shock peening AM50 Mg alloy stress corrosion Cl- concentration compressive residual stress
摘要
利用激光冲击强化技术对AM50镁合金进行了表面处理, 研究了试样在NaCl溶液中的抗应力腐蚀性能和断口形貌的变化, 并对断口进行了成分分析; 研究了激光冲击层数和氯离子浓度对AM50镁合金耐腐蚀性的影响。结果表明, 大面积激光冲击强化处理的AM50镁合金表面产生了残余压应力, 表层晶粒得到细化, AM50镁合金的抗应力腐蚀性能得到改善。AM50镁合金的抗应力腐蚀性能随激光冲击层数的增加而增强, 但随氯离子浓度的增大而减弱。
Abstract
The surface treatment of AM50 Mg alloys is conducted by the laser shock peening (LSP) technique. The resistance to tensile stress corrosion and the fracture morphologies of specimens in NaCl solution are investigated. The compositions of the fracture are also analyzed. The effects of laser shock layer number and Cl- concentration on the anticorrosion behavior of AM50 Mg alloys are researched. The results show that the large area LSP treatment to AM50 Mg alloys can induce the compressive residual stress and make the refinement of surface grains, and thus the resistance to tensile stress corrosion of AM50 Mg alloys is significantly improved. The resistance to tensile stress corrosion of AM50 Mg alloys is enhanced with the increase of laser shock layer number, but is weakened with the increase of Cl- concentration.
江崇远, 王长雨, 罗开玉, 鲁金忠. 激光冲击层数和氯离子浓度对AM50镁合金耐腐蚀性能的影响[J]. 中国激光, 2018, 45(9): 0902004. Jiang Chongyuan, Wang Changyu, Luo Kaiyu, Lu Jinzhong. Effects of Laser Shock Layer Number and Cl- Concentration on Anticorrosion Behaviors of AM50 Mg Alloys[J]. Chinese Journal of Lasers, 2018, 45(9): 0902004.