The protective properties of coatings on a magnesium alloy formed by plasma electrolytic oxidation in silicate electrolytes

• S.V. Oleynik¹, V.S. Rudnev^2,3, Yu.A. Kuzenkov¹, T.P. Jarovaja², L.F. Trubetskaja¹, N.N. Degtiarenko² and P.M. Nedozorov²

¹ A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky pr. 31, Moscow, 119071 Russian Federation
² Institute of Chemistry, Far-Eastern Branch of the Russian Academy of Sciences, pr. 100-letiya Vladivostoka 159, Vladivostok, 690022 Russian Federation
³ Far Eastern Federal University, Suhanova str. 8, Vladivostok, 690022 Russian Federation

Abstract: The protective properties and features of formation of plasma electrolytic coatings (PEO) on МА8 magnesium alloy in various silicate electrolytes were studied. It is shown that the addition of sodium fluoride to the silicate electrolyte reduces the number of pores in PEO coatings by increasing their size. PEO coatings formed in the electrolytes in the presence of fluorides possess greater protective properties both in the initial state and upon subsequent filling with corrosion inhibitors. A correlation between the stages of galvanostatic PEO machining and the corrosion resistance of the coatings was detected. The best coating characteristics are obtained at the stage of spark discharge and at the beginning of action of microarc discharges.

Keywords: magnesium alloys, plasma electrolytic oxidation, pitting corrosion, corrosion inhibitors

Int. J. Corros. Scale Inhib., 2018, 7, no. 1, 78-86 PDF (1 351 K)
doi: 10.17675/2305-6894-2018-7-1-7

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