Growth characteristics of scanning micro-arc oxidation coating on Ti6Al4V alloy

ABSTRACT

In this study, the ceramic coating was prepared on Ti6Al4V alloy by scanning micro-arc oxidation (SMAO). The growth features of SMAO coating were investigated by combining the voltage and discharge variation. The result shows that a higher working voltage is obtained during SMAO treatment owing to additional resistance from the electrolyte column. As the SMAO goes on, the discharge region moves to the electrolyte column edge, exhibiting an annular shape. The current density with Gaussian distribution is observed between the stainless-steel tube (cathode) and titanium substrate (anode), which causes the SMAO coating to show a higher thickness in the middle and lower on both sides. Similar to traditional MAO, the SMAO coating has an enhancement in the thickness, pore size and Si content with increasing oxidation time, but coating degradation occurs in the later stage of SMAO. The SMAO coating mainly consists of amorphous SiO₂, rutile and anatase phases.

KEYWORDS:

• SMAO
• titanium
• growth
• characteristics
• discharge

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The authors would like to appreciate financial supports from the National Natural Science Foundation of China (51975533 and U2130122) and Natural Science Foundation of Zhejiang Province (LGJ22E050002).