Effect of electrolyte composition on electrochemical formation and properties of ceramic-like coatings on aluminum alloys

Abstract

The electrochemical formation of ceramic-like coatings on D16 aluminum alloy was carried out using microarc oxidation method in phosphate (1.5 g/L NaOH + 9 g/L Na2SiO3 + 3 g/L Na3PO4) and molybdate (5 g/L NaOH + 30 g/L Na2SiO3 + 5 g/L (NH4)6Mo7O24) electrolytes. White and black ceramic-like coatings with thickness of 200–300 microns were obtained in phosphate and molybdate electrolytes, respectively.

A study of the electrolyte composition influence on the structure and properties of MAO coatings formed on AMg6 alloy

“…It was found that the use of different electrolytes leads to different surface porosities of the coatings, with better properties for the sodium phosphate electrolyte. Much attention is also paid to the influence of the electrolyte composition on the microarc oxidation process in many other works [41][42][43].…”