Abstract: Electroplated steel sheet suitable for soldering is provided herein by coating the plated steel sheet with a post-treatment solution in the range of 0.02 to 2 .mu.m in dry thickness. The post-treatment solution contains from 2 to 100 g/l of at least one water-soluble or water-dispersed material. The post-treatment solution may further contain chromium ion, hereafter referred to as Cr.sup.6+, from 0.01 to 3 g/l, and/or organic amine soap from 10 to 100 g/l. A suitable pH value of the post-treatment solution is from 3 to 10.

Abstract: Electroplated steel sheet suitable for soldering is provided by coating the plated steel sheet with a post-treatment solution in the range of 0.01 to 2 um in dry thickness. The post-treatment solution contains from 2 to 200 g/liter of at least one water-soluble or water-dispersed materials other than phosphoric esters, and/or from 5 to 200 g/liter of phosphoric esters, and also contains from 2 to 100 g/liter of at least one water-soluble or water-dispersable organic fluoro compound. The post-treatment solution may further contain from 0.01 to 3 g/liter of Cr.sup.6+ ion, and/or from 10 to 100 g/liter of organic amine soap. A suitable pH value of the post-treatment solution is between 3 and 10.

Abstract: A method for producing a metal substrate for a lithographic plate is provided herein by treating the substrate having the thickness in the range of 50 to 400 .mu.m. The said substrate is electrochemically, chemically or mechanically treated in order to provide an average surface roughness in the range of 0.1 to 3 .mu.m, followed by a surface treatment such as plating or chemical treatment, and then followed by a conventional hydrophilic treatment.

Abstract: A method for the production of a metal sheet covered with polyester resin film which comprises laminating a polyester resin film which is preferably crystalline and oriented onto a metal sheet having a lower layer of metallic chromium and an upper layer of hydrated chromium oxide, which sheet has been heated to a temperature above the melting point of polyester resin film and then immediately quenching. This metal sheet covered with polyester resin film is excellent in corrosion resistance and formability.

Abstract: Process of producing metal-resin composite, and the composite resulting therefrom, are provided. The process comprises providing a solution or dispersion of a resin, for example, an epoxy resin, said solution or dispersion having dispersed therein at least one particulate metal compound, for example, an oxide, of the Group I A and II A metals of the Periodic Table, the amount of metal compound being 1-500 parts by weight per 100 parts by weight of resin, then coating the solution or dispersion on a metal substrate and heating the coated substrate to evaporate the solvent for the resin and cure the resin. The resultant metal-resin composite is corrosion resistant, especially under acidic conditions, since the resin layer having the Group I A or II A metal compound dispersed therein serves to control the pH on the surface of the metal substrate to within the range of from 4 to 12 under acidic conditions in the atmosphere surrounding the metal-resin composite.

Abstract: A method for producing a metal substrate for a lithographic plate is provided herein by treating the substrate having the thickness in the range of 50 to 400 .mu.m. The said substrate is electrochemically, chemically or mechanically treated in order to provide an average surface roughness in the range of 0.1 to 3 .mu.m, followed by a surface treatment such as plating or chemical treatment, and then followed by a conventional hydrophilic treatment.

Abstract: Process of producing metal-resin composite, and the composite resulting therefrom, are provided. The process comprises providing a solution or dispersion of a resin, for example, an epoxy resin, said solution or dispersion having dispersed therein at least one particulate metal compound for example, an oxide, of the Group I A and II A metals of the Periodic Table, the amount of metal compound being 1-500 parts by weight per 100 parts by weight of resin, then coating the solution or dispersion on a metal substrate and heating the coated substrate to evaporate the solvent for the resin and cure the resin. The resultant metal-resin composite is corrosion resistant, especially under acidic conditions, since the resin layer having the Group I A or II A metal compound dispersed therein serves to control the pH on the surface of the metal substrate to within the range from 4 to 12 under acidic conditions in the atmosphere surrounding the metal-resin composite.

Abstract: A composite coated metal sheet suitable for outdoor building materials and having excellent weatherability, corrosion resistance and formability is provided herein by coating a metal sheet with a composite material essentially consisting of polyvinylchloride resin and flake-like aluminum powder, and in certain cases a metal powder and an alloy powder of zinc, tin and lead. Said composite coated metal sheet may be overlaid with an acrylic-type resin film.

Abstract: A method of treating steel sheets which have good corrosion resistance after forming, which comprises coating a steel sheet with a solution which contains:(a) water-soluble or water-dispersible lithium silicate at a concentration of 2 to 250 g/l, which lithium silicate is a mixture of silicic acid or silicate and lithium salt in a molar ratio of 20:1 to 1:1.(b) at least one water-soluble or water-dispersible saturated or unsaturated fatty acid compound, higher alcohol wax, polyethylene type resin, fluorine type resin or silicone type resin at a concentration of 1 to 250 g/l.

Abstract: A method of providing a composite coated steel sheet is provided herein by dipping a steel sheet into a suspension solution consisting of a water-soluble and/or water-dispersible organic polymer resin, a water-dispersible sol of a metal compound and an infusible powder of a water-insoluble polymer resin, removing the coated steel sheet from the suspension and curing the coated composite by heat treatment. In certain cases, a metal powder, an alloy powder of said metal and a powder of a difficultly water-soluble or water-insoluble compound of said metal may be used in the suspension solution.