Patent GB-1019202-A (GB)
Title: Coating compositions for protecting and lubricating surfaces
IPC: C23C22/74
Filed: 1964-06-11
Abstract: A coating composition for providing low friction bearing surfaces on metal substrates comprises two phases, one being P.T.F.E., an organic polymeric material having high inherent lubricity, the other being an inorganic complex capable of forming a continuous network entrapping and bonding the first phase consisting of dissolved phosphate, dissolved chromate, dichromate and/or molybdate and at least one dissolved metal.  The composition may be applied by spraying, dipping, rolling or brushing to wire, sheet stock, preformed structures, cellulose materials such as paper and cardboard, thin metal e.g. aluminium foil, ceramics, resins or phosphatized surfaces. The composition may comprise a 20-600 g./1. dispersion of the organic polymeric material (P.T.F.E.) in an aqueous solution containing 0.5-4 mols./1. dissolved phosphate (0-,m-p- or hypo-phosphoric acid or salts thereof e.g. of Mg, Zn, Al, Fe or Li), 0.3-3 mols./1. dissolved chromate or dichromate (chromic acid, CrO3 or salts thereof e.g. of Mg, Zn or Li), and 0.2-4 mols./1. dissolved metal such as Mg, Zn, Li, Na and/or K ions, preferably Mg and Zn ions.  When cured, e.g. by heating to 600-900  DEG F., both phases may have dispersed therein a finely divided particulate material obtained by adding to the composition a metal e.g. Al, Cu, Ni, Zn or Cr powder and/or particles of refractory oxide, carbide, nitride, silicide or silicate such as Al2O3, ZrO2, SiO2, SiC BN, MoSi2 or mica; dry lubricants such as graphite, MoS2, WS2 or lead oxide may be added.  Amorphous complexes, e.g. of phosphates and/or borates, and silicates may be used.  After curing the coating may be rolled, peened or burnished.ALSO:A coating composition for providing low friction bearing surfaces on metal substrates comprises two phases, one being P.T.F.E., an organic polymeric material having high inherent lubricity, the other being an inorganic complex capable of forming a continuous network entrapping and bonding the first phase consisting of dissolved phosphate, dissolved chromate, dichromate and/or molybdate and at least one dissolved metal.  The composition may be applied by spraying, dipping, rolling or brushing to wire, sheet stock, preformed structures, cellulose materials such as paper and cardboard, thin metal, e.g. aluminium foil, ceramics, resins or phosphatized surfaces.  The composition may comprise a 20-600 g/l. dispersion of the organic polymeric material (P.T.F.E.) in an aqueous solution containing 0.5-4 mols/l. dissolved phosphate (o-, m-, p- or hypo-phosphoric acid or salts thereof e.g. of Mg, Zn, Al, Fe or Li), 0.3-3 mols/l. dissolved chromate or dichromate (chromic acid, CrO3 or salts thereof e.g. of Mg, Zn or Li), and 0.2-4 mols/l. dissolved metal such as Mg, Zn, Li, Na and/or K ions, preferably Mg and Zn ions. When cured, e.g. by heating to 600-900 DEG  F., both phases may have dispersed therein a finely divided particulate material obtained by adding to the composition a metal e.g. Al, Cu, Ni, Zn or Cr powder and/or particles of refractory oxide, carbide, nitride, silicide or silicate such as Al2O3, ZrO2, SiO, SiC, BN, MoSi or mica; dry lubricants such as graphite, MoS2, WS2 or lead oxide may be added. Amorphous complexes, e.g. of phosphates and/or borates, and silicates may be used.  After curing, the coating may be rolled, peened or burnished.ALSO:A coating composition for providing low friction bearing surfaces on metal substrates comprises two phases, one being P.T.F.E., an organic polymeric material having high inherent lubricity, the other being an inorganic complex capable of forming a continuous network entrapping and bonding the first phase consisting of dissolved phosphate, dissolved chromate, dichromate and/or molybdate and at least one dissolved metal.  The composition may be applied by spraying, dipping, rolling or brushing to wire, sheet stock, preformed structures, cellulose materials such as paper and cardboard, thin metal e.g. aluminium foil, ceramics, resins or phosphatized surfaces.  The composition may comprise a 20-600 g./l. dispersion of the organic polymeric material (P.T.F.E.) in an aqueous solution containing 0,5-4 mols/l. dissolved phosphate (o-,m-p- or hypo-phosphoric acid or salts thereof e.g. of Mg, Zn, Al, Fe or Li), 0,3-3 mols/l. dissolved chromate or dichromate (chromic acid, CrO3 or salts thereof e.g. of Mg, Zn or Li), and 0,2-4 mols/l. dissolved metal such as Mg, Zn, Li, Na and/or K ions, preferably Mg and Zn ions.  When cured, e.g. by heating to 600-900  DEG F., both phases may have dispersed therein a finely divided particulate material obtained by adding to the composition a metal e.g. Al, Cu, Ni, Zn or Cr powder and/or particles of refractory oxide, carbide, nitride, silicide or silicate such as Al2O3, ZrO2, SiO, SiC, BN, MoSi or mica; dry lubricants such as graphite, MoS2, WS2 or lead oxide may be added. Amorphous complexes e.g. of phosphates and/or borates, and silicates may be used.  After curing, the coating may be rolled, peened or burnished.