Coating composition and method of application for improved corrosion resistance of metal parts

摘要

A new method and formulation for treating metal parts for corrosion resistance is disclosed wherein both a paint coat and an oil coating formulation are simultaneously applied in a single step to the parts after the parts have been conventionally phosphated. The novel formulation disclosed is a di-phase composition wherein a distinct paint phase and an oil phase are present. The formulation is applied to the parts only when the two phases have been intimately dispersed to form a temporary suspension. Upon drying, the treated part is provided with a paint undercoat covered by an oil coating and exhibits significantly improved corrosion resistance as measured by standard salt spray corrosion tests.