Open AccessEffect of duration of titanium microarc treatment on morphology, composition and electrochemical behavior of coatings
Author(s) -
М. В. Герасимов,
Н. Л. Богдашкина,
I. O. Kondratsky,
Pavel Peretyagin,
И. В. Суминов,
Е. В. Филонова,
А. И. Щербаков,
A. V. Apelfeld
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1396/1/012018
Subject(s) - titanium , materials science , passivation , sulfuric acid , coating , metallurgy , electrochemistry , corrosion , electrolyte , nickel , oxide , morphology (biology) , sulfate , anode , chemical engineering , composite material , electrode , chemistry , layer (electronics) , biology , engineering , genetics
Microarc oxidation (MAO) of titanium grade VT1-0 was carried out in the alkaline electrolyte with the addition of nickel sulfate. The effect of duration of titanium microarc treatment on morphology, composition and electrochemical behavior of coatings was investigated. It was found that nickel appears in MAO coatings only after a certain duration of the MAO treatment process (from 5 to 10 min), when the temperature in the micro-discharges becomes high enough for thermolysis of nickel sulfate and incorporation of its oxide into the coating (respectively, with a thickness of 2 to 5 μm). MAO coatings, despite their relatively small thickness, significantly increase the corrosion resistance of titanium in 25% sulfuric acid (anodic passivation currents are reduced up to 2 orders of magnitude).