Properties of Oxide-Ceramic Coatings on AK9M2 Alloy Synthesized in Electrolyte Modified with Hydrogen Peroxide

• Published in: Materials science (New York, N.Y.) Vol. 58; no. 1; pp. 112 - 118
• Main Authors: Posuvailo, V. М., Kovalchuk, І. V., Veselivska, H. H., Ivasenko, I. B.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-07-2022; Springer; Springer Nature B.V
• Subjects: Alloys; Aluminum base alloys; Aluminum oxide; Analysis; Ceramic coatings; Ceramic glazes; Ceramic materials; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Coatings; Corrosion resistance; Corundum; Electrolysis; Electrolytes; Hydrogen peroxide; Materials Science; Oxidation; Phase composition; Porosity; Protective coatings; Sillimanite; Solid Mechanics; Structural Materials; Thickness; sillimanite; oxide-ceramic coatings; porosity; plasma-electrolytic oxidation; X-ray phase diffraction analysis; crystalline structure; corrosion resistance
• ISSN: 1068-820X; 1573-885X
• DOI: 10.1007/s11003-022-00638-2

We study the influence of hydrogen peroxide on the phase composition, thickness, and porosity of oxide-ceramic coatings obtained by plasma electrolytic oxidation on AK9M2 aluminum alloy. It is established that, as a result of the addition of hydrogen peroxide to electrolyte, the thickness of the coating increases by 50% as compared with the initial electrolyte. A subsequent increase in the concentration of hydrogen peroxide leads to a decrease in porosity and an increase in the corrosion resistance of the coating. The maximum corundum content of 12 wt.% is obtained for a concentration of hydrogen peroxide equal to 5 g/liter. The corrosion resistance of the coatings obtained in the electrolyte with 7 g/liter H
2
O
2
is higher by two orders of magnitude than for the initial alloy and by an order of magnitude than for the coatings obtained in the base electrolyte. Silicon promotes the formation of sillimanite and quartz in the oxide-ceramic coatings.