Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (3): 842-849.doi: 10.13229/j.cnki.jdxbgxb20180112

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Effect of coverage layer on corrosion resistance of 6061⁃T6 aluminum alloy subjected to laser shock peening

Jin⁃zhong LU(),Wan⁃ting ZHOU,Sheng⁃yang ZHANG,Yi⁃kai SHAO,Chang⁃yu WANG,Kai⁃yu LUO   

  1. School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China
  • Received:2018-01-31 Online:2019-05-01 Published:2019-07-12

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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

CLC Number: 

  • TH16，TN249

Fig.1

Schematic diagram of LSPed region"

Fig.2

Photograph of specimen before and after LSP"

Fig.3

Residual stress distributions in surface ofdifferent laser shock peening layers"

Fig.4

Cross?sectional micro?hardness curves of laser shock peening sample"

Fig.5

Cross?section OM morphologies of LSPed specimens"

Fig.6

Three?dimensional and two?dimensionalmicrostructural topographies of LSPedspecimen"

Fig.7

Open circuit potential for all specimens in 3.5% NaCl solution"

Fig.8

Polarisation curves of as?machined specimen and LSPed specimens with different coverage layers in 3.5 % NaCl solution after immersion for 30 min"

Fig.9

Nyquist impedance spectroscopy of as?machined specimen and LSPed specimens with different coverage layers in 3.5% NaCl solution after immersion for 30 min"

Fig.10

Schematic illustration for corrosion behavior of LSPed material with different coverage layers"

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