Patent GB-1083474-A (GB)
Title: Aqueous phosphating solutions
IPC: B23K35/22
Filed: 1965-12-01
Abstract: Metals such as Fe, Zn, Al and galvanized Fe are phosphated (see Division C7) and then lubricated with the following lubricants prior to metal drawing and forming. ..Per cent .(1) Tetraethylene pentamine.3.2 .Sodium hydroxide.3.5 .Oleic acid.22.8 .Water.70.5 .(2) Triethanolamine.5.0 .Sodium hydroxide.1.8 .Tall oil.23.2 .Water.70.0 .(3) Monoethanolamine.2.8 .Potassium hydroxide.2.5 .Coconut fatty acids.24.7 .Water.70.0 .(4) Monoisopropanolamine.3.0 .Potassium hydroxide.1.0 .Soya bean fatty acids.23.5 .Polyoxyethylene trioleate.8.0 .Water.64.5 .(5) Sodium tallow soap.16.0 .Potassium carbonate.20.0 .Boric acid.20.0 .Borax.38.0 .Polyethylene glycol.6.0 .(6) Sodium tallow soap.15.0 .Borax.85.0 .(7) Sodium stearate.45.0 .Sodium sulphite.4.0 .Borax.38.0 .Water.13.0 .(8) Chlorinated wax.20 .SAE 40 mineral lubrication. .oil.80ALSO:Metals such as Fe, Zn, Al and galvanized Fe are phosphated by treating with an aqueous solution having a total acidity of 5 to 850 paints and containing by weight 0.1-40% phosphate ion, 0.2-55% nitrate ion and 0.2-30% lead ion.  The solution may also contain 0.001-0.5% of halides e.g. Na, K, and NH4 chloride bromides, iodides and fluorides and also surface active agents such as ethylene oxide condensates containing 3-25 polyoxyethylene groups, sodium alkyl sulphates, sulphonated hydrocarbons such as alkyl naphthalene sulphonic acid.  The solutions are prepared by dissolving phosphoric acid, nitric acid and lead oxide in water. Other salts which may be used are; ammonium, sodium or potassium dihydrogen phosphate, ammonium, sodium or potassium nitrate, lead nitrate, ammonium or sodium chloride, sodium bromide, sodium fluoride and nickel nitrate.  The solution temperature may be up to 300 DEG F. and following phosphating the metal is rinsed in an aqueous chromic acid solution containing 0.01-0.2% CrO3. The phosphated metal remains moldable, forms a base for siccative organic coatings and improves the drawing properties of the metal. Many examples are given of siccative coatings such as paint, lacquer, varnish, enamel and synthetic resins such as acrylic, alkyd, epoxy, phenalic and polyvinyl alcohol resins.  Examples of drawing lubricants are also included.  Paints may be applied electro-phoretically.  In an example a red primer paint, comprising a blended mixture of red oxide pigment, linseed fatty acids, melamine formaldehyde, and styrene-allyl alcohol copolymer esterified with linseed fatty acids and containing also cobalt naphthenate drier, is mixed with an emulsifying agent of ammonium hydroxide and demineralized water and electro-phoretic deposition of the paint is carried out by making the phosphated metal the anode.ALSO:Metals such as Fe, Zn, Al and galvanised Fe phosphated by treatment in an aqueous solution containing phosphate, nitrate and lead ions remains weldable and forms a base for siccative organic coatings.  Many examples are given of siccative coatings such as paint, lacquer, varnish, enamel, synthetic resins such as acrylic, alkyd, epoxy, phenolic and polyvinyl alcohol resins.  The organic coatings may be applied by brushing, spraying, dipping, roller coating, and flow coating. Examples of draining lubricants which may be applied to the phosphated surface are also given.