US 4,289,547 A · Aqueous acidic lubricant coating composition and method

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.

Claims21

Dependent claims

An aqueous acidic lubricant coating composition for treating metal surfaces prior to metal forming operations comprising an aqueous emulsion comtaining:

(a) from about 0.2% to about 15% by weight phosphate ions;
(b) from about 0.3% to about 16% of an emulsified organic lubricant selected from the group consisting of C.sub.8 to C.sub.40 carboxylic acids and alcohols including the esters, mono and polyamide salts, mono and polyalkyl (C.sub.1 -C.sub.18)amine salts thereof as well as mixtures thereof;
(c) from about 0.1% to about 10% of an emulsifying agent selected from the group consisting of N-tallow poly(propyleneamine) having from 1 to 5 propyleneamine groups, oxazoline waxes and mixtures thereof;
(d) from about 0.25% to about 3% of a chelating agent comprising ethylenediaminetetraacetic acid or the partial or tetra alkali metal or ammonium salts thereof;
and
(e) water;
said composition having a pH above that at which excessive pickling of the metal surface occurs and below that at which insufficient reaction with the metal surface occurs to form a phosphate coating.

4 more elements

Dependencies are inferred from the claim text.

Aqueous acidic lubricant coating composition and method

Life of this patent

Aqueous acidic lubricant coating composition and method

Life of this patent

Abstract

Claims21