Patent ID: 6248701
Filing Date: 2001-06-19
Classification: B21B,C09D,C10M,C10N,C23F

Abstract:
An aqueous liquid composition suitable for applying over a surface of a metal substrate to form a liquid coating from which a solid protective coating film can be formed on said surface, said aqueous liquid composition consisting essentially of water and:(A) a film-forming component of dissolved or dispersed polymeric constituents, exclusive of organic azoles but including at least some organic constituents that are capable of reacting with one another, with a metal surface being treated; or both or spontaneously coalescing; or both reacting and spontaneously coalescing; during or after at least one of (i) contact of the aqueous liquid composition with a metal surface, (ii) removal of water from said liquid coating remaining on the metal after such contact; said contact of the aqueous liquid composition with said metal surface and said removal of water from any liquid coating remaining on the metal after such contact occurring at a temperature not less than 20.degree. C., so as to form on the surface of the metal being treated an adherent protective solid film; said film-forming component is selected from the group consisting of:(A.1) (A.1.A) copolymers of styrene with (i) maleic anhydride, (ii) maleic acid, (iii) salts of maleic acid with ammonia, alkali metal hydroxides, and amines, or (iv) mixtures of any two or more of said copolymers; and(A.1.B) ethoxylated alcohol, and optionally one or more,(A.1.C) an inorganic boron containing component,(A.1.D) an extreme pressure or corrosion resistant additive,(A.1.E) a dispersed and/or dissolved solid lubricant exclusive of (A.1.C),(A.1.F) a component selected from solid and liquid hydrocarbons; and(A.2) (A.2.A) partially neutralized copolymers of an alkylene having not more than 4 carbon atoms with (i) acrylic acid or (ii) alkyl substituted acrylic acids having not more than 6 carbon atoms,(A.2.B) an alkoxylated alcohol film forming component, and, optionally(A.2.C) a boron containing inorganic salt or acid;(B) a primary inhibitor component selected from the group consisting of non-sulfur-containing organic azole compounds; and(C) a secondary inhibitor component selected from the group consisting of organic azoles that also contain mercapto moieties,wherein the concentration of component (B) is from about 100 ppm to about 10,000 ppm, the concentration of component (C) is from about 10 ppm to about 500 ppm, and the ratio of the concentration in ppm of component (C) to the concentration in ppm of component (B) is from about 0.0002:1.0 to about 0.2:1.0.