US 7,396,417 B2Granted

Method for removing laser scales

AssigneeChemetall GmbH

InventorsPeter Fischer, Hanspeter Brunner

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Abstract

A degreasing method for descaling or removing laser scales from iron-containing metal part surface by treating the iron-containing metal part surfaces that is optionally tainted with laser scales with an aqueous solution containing at least one type of highly water-soluble and complexed with Fe ions carboxylic acid, at least one type of salt of at least one type of carboxylic acid exhibiting the same action and at least one type of fatty amine ethoxylate, wherein the solution is buffered, the Fe ions are carried into the solution and at least partially complexed, increasing the pH value of the solution for descaling with respect to at least one type of carboxylic acid. The entire concentration of carboxylic acids and the salts thereof is increased for descaling by 2 to 20% by weight.

Claims9

Dependent claims

A process for removing laser scale on a surface of a ferriferous metal part having laser scale thereon by treating the surface of the ferriferous metal part with an aqueous pickling solution comprising:

at least one carboxylic acid which is water-soluble and complexes Fe ions from said metal part;
at least one salt of at least one carboxylic acid which is water soluble and complexes said Fe ions;
at least one fatty amine ethoxylate;
wherein the aqueous pickling solution is buffered;
wherein said Fe ions enter the aqueous pickling solution and are at least partially complexed;
wherein the pH of the aqueous pickling solution is higher than that of said at least one carboxylic acid present;
wherein the total concentration of the carboxylic acid and the carboxylic acid salt for pickling is from 2 to 20 wt. %;
and
wherein the laser scale on the surface of the ferriferous metal part is removed.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/662,846Filed 20 Sep 2005
Priority: DE 10 2004 046 73725 Sep 2004
Published: US 2008/0011323 A117 Jan 2008
Granted: 8 Jul 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

C23G 1/088
Iron or steel: solutions containing organic acids
B23K 26/38
Removing material: by boring or cutting
B23K 37/08
Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass: for flash removal
C11D 1/44
Amino alcohols or amino ethers: ethers of polyoxyalkylenes with amino alcohols; Condensation products of epoxyalkanes with amines