METHOD TO PRODUCE PROTECTIVE SUPERHYDROPHOBIC COATINGS ON STEEL Russian patent published in 2013 - IPC C25D11/34 

FIELD: metallurgy.

SUBSTANCE: method includes treatment of steel surface with the method of plasma electrolytic oxidation in bipolar mode in electrolyte, which contains, g/l: liquid glass 2Na₂O·SiO₂ 20-30 and sodium carbonate Na₂CO₃ 15-20, under anode voltage, rising from 20 to 300-330 V, and permanent cathode voltage of -25-30 V for 10-20 min. Onto the formed PEO coating by means of dipping with further drying at 80°C they apply a film of colloid orthosilicic acid. The waterproofing compound is a dispersion, containing wt %: methoxy {3-[(2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-pentadecafluorooctyl)oxy)propyl}silane 0.003-0.006 and aerosil 2.5-4.0 in anhydrous decane, which is deposited onto the film of orthosilicic acid.

EFFECT: improved hydrophobic properties and increased corrosion resistance of produced coatings.

2 cl, 3 ex, 5 dwg