MAKING OF PROTECTIVE COATINGS ON VALVE METALS AND THEIR ALLOYS Russian patent published in 2014 - IPC B05D7/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to protective antifriction coatings that feature high wear and corrosion resistance on valve metals and their alloys, primarily on titanium and its alloys, aluminium and its alloys and magnesium alloys. It can be used for antirust protection of metal parts and structures operated in water corrosive media, at high moisture content and under effects of aggressive ions. Proposed method comprises electrochemical treatment of metal surface. This is performed at voltages that allow plasma micro discharges at electrolyte-electrolyte interface at current effective density in electrolyte of 0.5-1.0. Electrolyte comprises soluble phosphate, tartrate or silicate and is a colloidal solution with pH 8.0-10.5.PRFE ply is applied from suspension containing PTFE particles of 0.2-0.6 mm in isopropyl spirit with addition of wetting agent OP-10. Components ate taken at the following ratio: PTFE - 100.0-150.0, wetting agent OP-10 - 6.0-8.0, isopropyl alcohol making the rest. Now coating is subjected to heat treatment.

EFFECT: higher antirust properties and wear resistance.

4 cl, 2 dwg, 5 ex