| abstract |
The disclosed composition and method are useful for imparting corrosion resistance to metal surfaces. Predominately iron, aluminum or zinc surfaces are treated with an aqueous solution comprising phosphate ions, simple fluoride ions, chlorate ions and one or more Group VIIIb metal cations in specified concentrations. The composition contains essentially no bromate or ''''coating-metal'''' cation. Metals treated with the disclosed composition are particularly suited for treating metals which are to be subsequently painted and subjected to cold forming. |