Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (2): 501-510.doi: 10.13229/j.cnki.jdxbgxb20200037

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Effect of spot diameteron corrosion resistance of aluminum alloy subjected to laser shock peening

Kai-yu LUO1,2(),Jun-cheng CHEN1,Chang-yu WANG1,Jin-zhong LU1   

  1. 1.School of Mechanical Engineering，Jiangsu University，Zhenjiang 212013，China
    2.College of Engineering Technology，Jiangsu University，Zhenjiang 212013，China
  • Received:2020-01-14 Online:2021-03-01 Published:2021-02-09

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Abstract:

In order to investigate the effect of different spot diameters on the electrochemical corrosion resistance of 6061-T6 aluminum alloy subjected to laser shock peening， the surface roughness and residual stress of the alloy were measured. The cross-sectional metallographic and electrochemical corrosion experiments were carried out. Corroded specimens were observed and analyzed by scanning electron microscope （SEM） and energy dispersive spectroscopy （EDS）. Results show that laser shock peening refines the surface grains of 6061-T6 alloy， increases the surface roughness and generates a compressive residual stress. The corrosion current densities of the untreated specimen， treated specimens with 2 mm and 3 mm spot diameters were 154.5 μA/cm2， 14.70 μA/cm2 and 11.17 μA/cm2， respectively， indicating that laser shock peening effectively improves the corrosion resistance. The treated specimen with 2 mm spot diameter had worse surface topographies than that of the treated specimen with 3 mm spot diameter， resulting in the lower corrosion resistance.

Key words: laser shock peening, aluminum alloy, electrochemical corrosion, surface roughness, residual stress

CLC Number: 

  • TN249

Fig.1

Schematic illustration of LSPed region"

Fig.2

Surface residual stress of untreated and different LSPed specimens"

Table 1

Surface roughness of different laser shock peening"

试样Ra(x)Ra(x)ˉRa(y)Ra(y)ˉRaˉ
测量1测量2测量3测量1测量2测量3
未冲击-01.8311.9221.7551.8361.8021.7691.8651.8191.828
未冲击-11.7021.8101.9171.8101.8851.9571.8011.8811.846
LSP-2 mm-02.4922.6022.5902.5612.4382.7392.4802.5522.557
LSP-2 mm-12.5902.4822.6042.5592.5182.6202.5052.5472.553
LSP-3 mm-02.0351.9022.2692.0692.1272.0172.1752.1362.103
LSP-3 mm-12.1132.0632.0892.0882.1852.1042.2272.1722.130

Fig.3

Cross-section OM morphologies of the LSP-2 mm specimen"

Fig.4

Cross-section OM morphologies of LSP-3 mm"

Fig.5

Time dependence of open circuit potential for different Aluminum specimens in 3.5% NaCl solution"

Fig.6

Typical Nyquist plots of different Aluminum specimens in 3.5% NaCl solution."

Fig.7

Potentiodynamic polarization curves of different Aluminum specimen in 3.5% NaCl solution."

Table 2

Different corrosion parameters obtained from polarization curves in Fig.7"

试样自腐蚀电位/（V vs.SCE）点蚀电位/ （V vs.SCE）钝化电位/ (V vs.SCE)自腐蚀电流密度/(μA·cm-2)
未冲击-1.276-0.669-1.056154.5
LSP-2 mm-1.216-0.698-1.09814.70
LSP-3 mm-1.192-0.671-0.85111.17

Fig.8

Surface morphology of untreated specimens after electrochemical corrosion"

Fig.9

Surface morphology of LSP-2 mm specimens after electrochemical corrosion"

Fig.10

Surface morphology of LSP-3 mm specimens after electrochemical corrosion"

Fig.11

Energy spectrum composition analysis diagram"

Fig.12

Schematic illustration of electrochemical corrosion reaction of as-machined and different LSPed specimens in 3.5% NaCl solution"

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