Electrochemical Corrosion Behaviors Before and After Laser Polishing of Additive Manufactured TC4 Titanium Alloy

Conghao Liao; Jing Zhou; Hong Shen

doi:10.3788/CJL202047.0102003

Chinese Journal of Lasers, Volume. 47, Issue 1, 0102003(2020)

Electrochemical Corrosion Behaviors Before and After Laser Polishing of Additive Manufactured TC4 Titanium Alloy

Conghao Liao¹, Jing Zhou², and Hong Shen^1,3、*

Author Affiliations

¹School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

²School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

³State Key Laboratory of Mechanical System and Vibration, Shanghai 200240, China

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Figures & Tables(13)

Fig. 1. AM TC4 titanium alloy sample and scanning mode of laser polishing. (a) Sample of AM TC4 titanium alloy; (b) scanning mode of laser polishing

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Fig. 2. Comparison of polarization curves of initial and laser polished surfaces

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Fig. 3. Profiles of laser polished surfaces in different directions. (a) In x direction; (b) in y direction

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Fig. 4. Picture of laser polished surface

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Fig. 5. Microstructures of titanium alloy before and after laser polishing. (a) Initial surface; (b) polished surface

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Fig. 6. XRD spectra of titanium alloy before and after laser polishing

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Fig. 7. Grains of titanium alloy before and after laser polishing. (a) Initial surface; (b) polished surface

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Fig. 8. Grain sizes of titanium alloy before and after laser polishing. (a) Initial surface; (b) polished surface

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Table 1. Chemical composition of TC4 titanium alloy
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Table 1. Chemical composition of TC4 titanium alloy
Element Al V Fe C O N H Ti
Mass fraction /% 5.5-6.5 3.5-4.5 0-0.25 0-0.08 0-0.13 0-0.05 0-0.12 Balance

Table 2. Experimental parameters of laser polishing
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Table 2. Experimental parameters of laser polishing
Parameter Laserpower /W Scanning speed /(mm·s^-1) Hatchingspace /μm
Value 150 10 150

Table 3. Self-corrosion potential and self-corrosion current density of initial and laser polished surfaces
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Table 3. Self-corrosion potential and self-corrosion current density of initial and laser polished surfaces
Sample Self-corrosionpotential /V Self-corrosion currentdensity /(μA·cm^-2)
Initial TC4 -0.398 3.132
Polished TC4 -0.155 8.612

Table 4. Surface roughness of titanium alloy before and after laser polishing
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Table 4. Surface roughness of titanium alloy before and after laser polishing
Sample R_a(x) /μm $\begin{matrix} {\bar{R}}_{a} \end{matrix}$ (x) /μm R_a(y) /μm $\begin{matrix} {\bar{R}}_{a} \end{matrix}$ (y) /μm $\begin{matrix} {\bar{R}}_{a} \end{matrix}$ /μm
Initial TC4 12.34 12.44 12.53 12.44 11.96 12.28 12.31 12.18 12.3
Polished TC4 0.70 0.75 0.84 0.76 1.02 1.03 1.06 1.04 0.9

Table 5. Test results of residual stress of initial and laser polished surfaces
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Table 5. Test results of residual stress of initial and laser polished surfaces
Sample Residual stress(x) /MPa Residualstress (y) /MPa
Polished TC4 132.9±68 145.1±117.7
Initial TC4 -981.5±66.9 -826.5±135.2

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Conghao Liao, Jing Zhou, Hong Shen. Electrochemical Corrosion Behaviors Before and After Laser Polishing of Additive Manufactured TC4 Titanium Alloy[J]. Chinese Journal of Lasers, 2020, 47(1): 0102003

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