Process for the coating of metallic components with an aqueous organic composition

Abstract

The invention relates to a process for the coating of surfaces of a metallic component to be formed by at least one forming operation like cold-forming, cold-forging, roll-stamping, roll-forming, deep-drawing or wire-drawing by contacting the surfaces of the metallic component before the forming operation with an aqueous composition that contains predominantly organic polymeric material whereby the aqueous composition contains at least one compound each of: A) organic film-forming polymeric material(s) selected from the group consisting of ionomeric copolymers, copolymers chemically related to ionomeric copolymers showing nearly or totally the properties of ionomeric copolymers and their corresponding monomers, comonomers, oligomers, cooligomers, polymers, blockcopolymers as well as their esters, salts and derivates, which all together are constituents of at least 80% by weight of the total organic polymeric material and whereby the total organic polymeric material has an average acid number in the range from 20 to 300, A′) optionally at least one further organic film-forming polymer or their corresponding monomer(s), oligomer(s), copolymer(s), blockcopolymer(s), their derivates or any combination of them that do not belong to A) participating in the rest of the total organic polymeric material to 100% by weight, B) optionally neutralizing agent(s), C) low temperature corrosion inhibiting cross-linking agent(s) and D) water, whereby the pH of the aqueous composition is at the beginning of the coating process in the range from 6 to 10.5.

Description

[0001] The invention relates to a process for the coating of a metallic component to be formed by at least one forming operation like cold-forming, cold-forging, roll-stamping, wire-drawing, deep-drawing or roll-forming by contacting the metallic component before the forming operation with an aqueous composition that contains predominantly organic polymeric material as well as to a method of the use of such coated components. BACKGROUND OF THE INVENTION [0002] Such aqueous compositions may be used to coat metallic components like coils, sheets, plates, foils, plastic laminated metal foils and other laminated components, parts of any shape or wires or any combination of these to generate organic coatings with a high flexibility and high resistance against corrosion. Such compositions may be used for the production e.g. of corrugated iron, gutters, profiles, tubings, automotive stampings, housings, electronic equipment or guard rails. Such components may further be used for inside or ...

AI Technical Summary

Benefits of technology

[0004] It was an object of the present invention to form thin organic corrosion protecting coatings at temperatures below 80° C. PMT (peak-metal-temperature). It was a further object to propose compositions and coatings to be used with c

Problems solved by technology

It has been found that if a significant content of a wax dispersion was added to the aqueous organic composition, there typically occurred trouble as thi