Abstract Improved processes for applying aluminum coatings on substrates wherein aluminum is applied to the surface of the substrate and the aluminum surfaced substrate is then heated to a temperature in the range of 350*-450* C with adjacent aluminum surfaces at least in part in contact with other such surfaces. Commonly such aluminum surfaced substrates are placed in contact with each other either in the form of a closed coil or a stack. The improvement comprises applying to the said aluminum surfaced substrate prior to the heat treatment, a coating of an aqueous solution of an organic acid in an amount sufficient to give a dry coating of from 2 to 50 milligrams per square foot. The preferred organic acids are acetic acid, succinic acid, oxalic acid and malonic acid.
Inventors
👤 R Green
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-02 14:05
CPC Classifications
C; C23; C23C; C23C24/00; C23C24/08; C23C26/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
46 words
The process of claim 1 wherein said organic acid applied to said surface is in an amount sufficient to give a dry coating of from 5 to 20 milligrams per square foot, and wherein said heat treatment is at a temperature in the range of 350*-450*C.
Claim 2
Dependent Claim
25 words
The process of claim 2 wherein said organic acid is selected from the group consisting of acetic acid, succinic acid, oxalic acid and malonic acid.
Claim 3
Dependent Claim
49 words
The process of claim 3 wherein aluminum powder is applied to the surface of a steel strip and then compacted onto the steel strip by passing through rolls and then coated with an aqueous solution of said organic acid and dried and the strip is then coiled and heat-treated.
Claim 4
Dependent Claim
20 words
The process of claim 4 wherein said aqueous solution of said organic acid has a pH of less than 4.
Claim 5
Dependent Claim
20 words
The process of claim 4 wherein said aqueous solution of said organic acid has a pH of greater than 9.
Claim 6
Dependent Claim
25 words
The process of claim 1 wherein said organic acid is selected from the group consisting of acetic acid, succinic acid, oxalic acid and malonic acid.
Claim 7
Dependent Claim
46 words
The process of claim 7 wherein said organic acid is applied to said surface in an amount sufficient to give a dry coating of from 5 to 20 milligrams per square foot, and wherein said heat treatment is at a temperature in the range of 350*-450*C.
Claim 8
Dependent Claim
20 words
The process of claim 8 wheRein said aqueous solution of said organic acid has a pH of less than 4.
Claim 9
Dependent Claim
20 words
The process of claim 8 wherein said aqueous solution of said organic acid has a pH of greater than 9.