JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2017, Vol. 47 ›› Issue (3): 139-142.doi: 10.6040/j.issn.1672-3961.0.2017.003

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Influence of different acid-etching time on the surface morphology and corrosion resistance of TC4 titanium alloys after sandblasting

REN Bing, WAN Yi*, WANG Guisen, WANG Teng   

  1. Key Laboratory of High Efficiency and Clean Mechanical Manufacture Ministry of Education, Shandong University, Jinan 250061, Shandong, China
  • Received:2017-01-03 Online:2017-06-20 Published:2017-01-03

Abstract: TC4 Titanium plates were etched by HCl/H2SO4 mixture after being blasted by Al2O3 particles of size 220 to investigate the effect of different etching time(0.5,1, 2 and 3 h)on the surface morphology and corrosion resistance, while the polishing treatment was set as the control group. The surface morphology of the titanium alloy samples was characterized by scanning electron microscopy(SEM)and 3D laser confocal microscopy followed by the surface roughness measurement. Then the corrosion resistance measurement was carried out by the electrochemical workstation to evaluate the corrosion behavior of all samples. The results showed that with the prolongation of etching time, the surface morphology of titanium alloy tended to be homogenized from clutter, and the roughness first rose and then decreased. Group 2 h had the maximum roughness and the highest proportion of surface micropores, and the interface expansion area ratio was 222%. In terms of corrosion resistance, all of the sandblasting and acid-etching(SLA)groups performed better than the polishing group, indicating that the SLA treatment can be beneficial for generating oxide film which possesses better corrosion resistance. Besides, with the extending of etching time, the corrosion tendency was smaller, and the group 3 h performed the best of all groups.

Key words: titanium, implant, microporous structure, sandblasting and acid-etching, corrosion resistance

CLC Number: 

  • TG162.2
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