Abstract: The present invention relates to compositions and methods for providing a corrosion-resistant coating on a zinc-cobalt alloy surface said surface with a hexavalent chromium-containing treatment solution. In a preferred embodiment, the solution comprises:(a) about 2 to about 30 g/l of CrO.sub.3 ;(b) 0 to about 25 g/1 of dichromate ion such that the total Cr.sup.+6 is about 1 to about 35 g/l;(c) about 0.5 to about 20 g/l of NH.sub.4.sup.+ ; and(d) about 5 to about 30 g/l of formate ion.The solution additionally comprises:(e) about 2 to about 25 g/l of Cl.sup.- ; and has a pH controlled by the addition of HCl or NaOH of about 0.8 to about 2.5. The solution is substantially-free of sulfate, chlorate and nitrate. In one embodiment, the formate is optional and low levels of Cr.sup.+6 are employed.

Abstract: A composition and a method for applying a lubricant coating to clean metal surfaces prior to subjecting them to metal forming operations. The composition comprises a concentrate which is adapted to be diluted with water, if desired, to produce an aqueous acidic operating bath containing a controlled effective amount of phosphate ions to form a phosphate coating on the clean metal surface in combination with an emulsified organic lubricant agent, an emulsifying agent and an iron chelating agent. The coating composition may further optionally contain a controlled amount of a corrosion inhibiting agent and heavy metal cations for activating the coating bath. The coating composition is applied to a clean metal surface such as by flooding, immersion, spraying, or the like, at temperatures from ambient up to about 200.degree. F. for a period of time sufficient to effect a desired coating magnitude whereafter the parts are dried, preferably at elevated temperatures before forming.