激光冲击强化层数对6061⁃T6铝合金抗腐蚀性能的影响

doi:10.13229/j.cnki.jdxbgxb20180112

摘要/Abstract

摘要：

针对6061?T6铝合金在各种极端工况下抗腐蚀性较差的问题，采用激光冲击强化对6061?T6铝合金进行不同层数的冲击处理，通过测量残余应力和表面粗糙度观察了微观组织和电化学腐蚀，分析了激光冲击强化对6061?T6铝合金抗腐蚀性能的影响。结果表明：激光冲击强化后，材料表面的残余压应力、表面硬度随激光冲击层数的增加而增加；冲击区域晶粒明显细化，细化层深度随冲击层数的增加而增加；材料表面的粗糙度随冲击层数的增加而降低；激光冲击强化处理后材料的电化学腐蚀电流减小、阻抗半径增大，表面点蚀坑的生长受到明显抑制；残余应力增加、微观组织细化和表面粗糙度降低，三者共同作用提升了6061?T6铝合金的抗腐蚀性能。

关键词: 机械制造, 激光冲击强化, 6061?T6铝合金, 残余应力, 微观组织, 表面粗糙度, 抗腐蚀性能

Abstract:

To solve the problem of the poor corrosion resistance of 6061?T6 aluminum alloy under various extreme working condition, experiments for 6061?T6 aluminum alloy were carried out using laser shock peening with different coverage layers. Then the effect of laser shock peening on the corrosion resistance of 6061?t6 aluminum alloy was analyzed by measuring the residual stress and surface roughness, observing the microstructure and electrochemical corrosion test. The results suggest that the residual stress and surface hardness increase with the increase of the laser shock coverage layer. The alloy grains are refined obviously in the impacting area, and the scale of grain refinement layer extends with the increase of laser shock coverage layer. The surface roughness decreases with the increase of laser shock coverage layer. After laser shock peening, the corrosion resistance of 6061?T6 aluminum alloy is obviously improved, the electro?chemical corrosion current decreases and the impedance radius increases, the growth of surface pitting pits is obviously inhibited. The combining effects of increased residual stress, microstructure refinement and decreased surface roughness improve the corrosion resistance of 6061?T6 aluminum alloy.

Key words: mechanical manufacture, laser shock peening(LSP), 6061?T6 aluminum alloy, residual stress, microstructure, surface roughness, corrosion resistance

中图分类号:

TH16，TN249

鲁金忠,周婉婷,张圣洋,邵亦锴,王长雨,罗开玉. 激光冲击强化层数对6061⁃T6铝合金抗腐蚀性能的影响[J]. 吉林大学学报(工学版), 2019, 49(3): 842-849.

Jin⁃zhong LU,Wan⁃ting ZHOU,Sheng⁃yang ZHANG,Yi⁃kai SHAO,Chang⁃yu WANG,Kai⁃yu LUO. Effect of coverage layer on corrosion resistance of 6061⁃T6 aluminum alloy subjected to laser shock peening[J]. Journal of Jilin University(Engineering and Technology Edition), 2019, 49(3): 842-849.

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