Evaluation of electrochemical properties of the PEO-coatings treated with hydrophobic agent solution on aluminium alloy

摘要

The developed methods of formation and results of the study of the hydrophobic layers on aluminum alloy, previously subjected to plasma electrolytic oxidation (PEO) and additional treatment (either in ethanol solution or under UV-radiation in the presence of ozone plasma) with subsequent deposition of the hydrophobic agent (methoxy-{3-[(2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 8-pentadecafluoroctyl)oxy]propyl}-silane solution in decane) have been described. It was found, that the formed composite layers possess a hydrophobicity (contact angle higher 157°) and high anticorrosion properties (the impedance modulus, |Z|_f = 0.01 Hz, ranges from 9.2·10~9 to 4.0·10~(10) Ohm·cm~2 depending on the treatment procedure).