Abstract: The invention is the chemical composition and method for forming a chemical conversion coating on ferrous metal surfaces and subsequent coloring of said conversion coating through the application of a water-soluble dye. The conversion coating has an ordered crystalline structure composed of ferrous oxalate or other ferrous dicarboxylates. The conversion coating can be colored through the application of a water-soluble reactive dye which bonds with Fe (II) within the ferrous dicarboxylate matrix, bound to the dicarboxylate molecules, thereby becoming water insoluble and permanent. When sealed with an appropriate rust preventive top coat, the result is an attractive and protective finish of minimal thickness which can be applied through simple immersion process techniques. Said finish can serve as a final protective finish on a fabricated ferrous metal article and also affords a degree of lubricity for assembly, break-in purposes, or anti-galling protection and serves as an adhesive base for paint.

Abstract: A process for improving the corrosion resistance of an iron or steel part having a phosphate conversion coating, said method comprising contact of said part with a solution containing ions selected from the group of cobalt ions and nickel ions. Preferably, the solution also containing stannous ions. Contact may be by immersion or spraying.

Abstract: A process for improving the corrosion resistance of an iron or steel part having a phosphate conversion coating, said method comprising contact of said part with a solution containing ions selected from the group of cobalt ions and nickel ions. Preferably, the solution also contains stannous ions. Contact may be by immersion or spraying.

Abstract: A process for improving the corrosion resistance of an iron or steel part having a phosphate conversion coating, said method comprising contact of said part with a solution containing ions selected from the group of cobalt ions and nickel ions. Preferably, the solution also contains stannous ions. Contact may be by immersion or spraying.

Abstract: The invention is for a process for providing a protective, color receptive coating over aluminum using chemical means without a requirement for the use of an electric current as in electrical anodizing. Absent conventional steps such as water rinses, the process comprises cleaning, including desmutting of the surface of an aluminum part as necessary, and treatment with an aqueous alkaline solution of ferric citrate for a time sufficient to provide the coating over the part. The treated aluminum part has enhanced corrosion resistance and the coating over the part acts as a base for other coatings such as paint, and is readily dyed.