Surface modification of aluminum alloy AMg6 by ethanol solutions of alkyl phosphates

• A.M. Semiletov¹, A.A. Kudelina¹, E.S. Khudoleeva² and Yu.I. Kuznetsov¹

¹ A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky pr. 31, 119071 Moscow, Russian Federation
² LDC SPA “NIIPAV”, Khimikov st. 62, 347366 Volgodonsk, Rostov region, Russian Federation

Abstract: The paper considers the possibility of obtaining superhydrophobic (SHP) protective films from ethanol solutions of phosphoric acid esters (monododecyl phosphate and didodecyl phosphate) on the surface of aluminum alloy AMg6 after its pre-etching with 10% NaOH solution at t=60°C in order to obtain polymodal roughness. It is shown that the alloy treatment in alkyl phosphate solutions leads to superhydrophobization of the surface. The stability of obtained coatings in alkylphosphate solutions is compared with similar alloy surface treatment in dodecylphosphonic and dodecanoic acid solutions. The protective ability of the coatings obtained was evaluated by polarization measurements and corrosion tests in a temperature-humidity chamber. It was established that the best anti-corrosion properties are shown by films formed from solution containing 10 mmol·L^–1 of the monododecyl- and didodecylphosphate mixture.

Keywords: aluminum, corrosion, superhydrophobicity, corrosion inhibitors, alkylphosphates

Int. J. Corros. Scale Inhib., 2024, 13, no. 2, 1292-1303
doi: 10.17675/2305-6894-2024-13-2-34

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