Treatment of metal parts to provide rust-inhibiting coatings

摘要

The invention describes a method of producing an adherent and corrosion-inhibiting multi-layer coating on metal parts comprising the steps of (A) phosphating the metal parts with an aqueous metal phosphating solution; (B) electrophoretically depositing a film of a siccative organic coating composition on the phosphated metal parts; (C) applying a second film of a composition comprising at least one film-forming organic resin component as a seal coat; (D) curing the coating on the metal parts; and optionally (E) applying a corrosion-inhibiting film as a top seal coat.