Influence of anions in phosphate and tetraborate electrolytes on growth kinetics of microarc oxidation coatings on Ti6Al4V alloy

The growth kinetics of microarc oxidation (MAO) coatings on Ti6Al4V alloy was studied by designing an electrolyte with low content and high content, using scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and potentiodynamic polarization. The results showed that incr...

Full description

Saved in:
Bibliographic Details
Published inTransactions of Nonferrous Metals Society of China Vol. 32; no. 7; pp. 2243 - 2252
Main Authors WANG, Xiao-ming, ZHANG, Fu-qin
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.07.2022
Subjects
anions
electrolyte
growth kinetics
microarc oxidation
phosphate
tetraborate
Ti6Al4V alloy
microarc oxidation
tetraborate
phosphate
growth kinetics
anions
electrolyte
Ti6Al4V alloy
Online AccessGet full text

Cover

More Information
Summary:The growth kinetics of microarc oxidation (MAO) coatings on Ti6Al4V alloy was studied by designing an electrolyte with low content and high content, using scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and potentiodynamic polarization. The results showed that increased the spark intensity and dissolved most of the oxides at high temperatures. Then, a thicker barrier layer at the coating/substrate interface was produced, which increased the polarization resistance of the coating. at a low concentration also promoted the uniform growth of the MAO coating and the formation of hat-shaped holes in the outer deposition layer. The thickness of the MAO coatings obtained in Na2B4O7 electrolytes exhibited an exponential increase with time at spark discharge stage, while that of the MAO coating obtained in phosphate–tetraborate electrolytes showed a linear trend as the content increased.
ISSN:1003-6326
DOI:10.1016/S1003-6326(22)65944-2