Protective hydrophobic and oleophilic coating for aluminum produ

Details Protective hydrophobic and oleophilic coating for aluminum produ Protective hydrophobic and oleophilic coating for aluminum produ

1976-07-27

1978-07-18

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

427292, 427327, 72 46, 72 42, 252 32, C23F 700

Patent

active

041013468

ABSTRACT:
This invention is directed to a process for forming a hydrophobic and highly oleophilic coating on an aluminum surface which comprises treating the aluminum surface under aqueous alkaline conditions with a long chain aliphatic carboxylic acid (or an equivalent carboxylate compound), such as isostearic acid, which has one or more short secondary alkyl groups on or near the nonpolar end of the carboxylate compound. The coating can be formed by treating the surface with an aqueous alkaline solution which contains the carboxylic acid or the coating can be formed by mechanically deforming or upsetting the aluminum surface to expose a fresh aluminum surface to a carboxylic acid (or its equivalent) and a compound which generates alkaline conditions on the aluminum surface. In the latter instance, the carboxylic acid and alkaline compound is preferably incorporated into a metal-working lubricant used to facilitate deformation.

REFERENCES:
patent: 2107288 (1938-02-01), Curran
patent: 2230273 (1941-02-01), Smith
patent: 2599353 (1952-06-01), Showalter
patent: 2739915 (1956-03-01), Schuster et al.
patent: 2963391 (1960-12-01), Kubie
patent: 3228866 (1966-01-01), Pryor
patent: 3781177 (1973-12-01), Kondis
patent: 3849207 (1974-11-01), Marossi
patent: 3911704 (1975-10-01), Bridenbaugh et al.
patent: 3923671 (1975-12-01), Knepp

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