Method for removing organic coatings from substrates using carboxylic acids, organic solvents, and corrosion inhibitors
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United States of America Patent
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Jul 27, 1999
Grant Date -
N/A
app pub date -
Nov 11, 1998
filing date -
Nov 11, 1998
priority date (Note) -
Expired
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Abstract
A method for removal of an organic film from a metal substrate comprising: (a) preparing a stripping bath comprising a mixture of a salting-out agent, a carboxylic acid, and an organic solvent, said organic solvent in a concentration at about or greater than its solubility limit in water and having a solubility limit of 1/2% to 50% by weight in water, wherein said organic solvent is selected from the group consisting of butoxy ethanol, hexoxy ethanol, butoxy-2-ethoxy ethanol, dibasic ester, 2-ethyl hexyl alcohol, straight chain alcohol having from 6 to 16 carbons, N-methyl-pyrrolidone, and mixtures thereof, and said carboxylic acid is selected from the group consisting of hydroxy carboxylic acids, lactic acid, glycolic acid, citric acid, malic acid, tartaric acid, and mixtures thereof, and said salting-out agent is selected from a group consisting of glucoheptonate, gluconate, and mixtures thereof, and (b) immersing said metal substrate in the stripping bath of step (a) for a predetermined period of time to loosen said organic film and thereby remove said organic film from said metal substrate. The stripping bath mixture can be used for removal of an electrophoretic coating from a metal substrate.
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