Influence of the Conditions of Plasma-Electrolytic Treatment of D16T Aluminum Alloy on its Corrosion Resistance in 3% NaCl Solution

• Published in: Materials science (New York, N.Y.) N.Y.), 2021, Vol.56 (4), p.550-559
• Main Authors: Student, M. М., Veselivska, H. H., Kalakhan, O. S., Hvozdetskyi, V. М., Zadorozhna, Kh. R., Sirak, Ya. Ya
• Format: Article
• Language: English
• Subjects: Alloys; Aluminum; Aluminum base alloys; Aqueous solutions; Cathodic coating (process); Ceramic coatings; Ceramic materials; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Coatings; Corrosion currents; Corrosion resistance; Corrosion resistant alloys; Electrolysis; Electrolytes; Hydrogen peroxide; Materials Science; Oxidation resistance; Peroxides; Protective coatings; Sodium chloride; Solid Mechanics; Specialty metals industry; Structural Materials; Synthesis
• ISSN: 1068-820X; 1573-885X
• DOI: 10.1007/s11003-021-00463-z

We study the influence of electrolyte composition and the parameters of the plasma-electrolytic oxidation of D16Т alloy on the corrosion resistance of synthesized coatings in a 3% NaCl aqueous solution. It was discovered that oxide-ceramic coatings decrease the density of corrosion currents by an order of magnitude as compared with the initial alloy. The lowest corrosion currents were recorded in coatings synthesized for the ratios of the cathodic and anodic components of current j c / j a equal to 15/10 and 10/10. It is shown that corrosion currents become stronger as the content of hydrogen peroxide (H 2 O 2 ) in the electrolyte increase. This is explained by the increase in the sizes of through pores in the synthesized coatings. Through these pores corrosive media penetrate to the base material and, as a result, the rate of aluminum dissolution becomes higher.