Patent ID: 9539456
Date: 2017-01-10
CPC Classifications: A62D,C23C

Claim:
1. A formulation for reducing Cr(VI) within a Cr(VI) containing coating that is bonded to a substrate, comprising: a. at least one reducing chemical capable of reducing Cr(VI) to Cr(III), selected from a group consisting of ferrous salts, hydroxylamines and like, ascorbic acid, ascorbate, sorbate, sorbic acid, acetic acid, propionic acid, butylated hydroxytoluene, butylated hydroxyanisole, tert-butylhydroquinone, propyl gallate, glycolic acid (or hydroxyacetic acid) and other a-hydroxy acids (AHA), formic acid, other similar acids, and a mixture; and b. one or more solvents that are capable of helping the reducing chemical penetrate into the coating to reduce Cr(VI) within the coating; wherein the combined action of the reducing chemical and the solvent is able to penetrate into the coating to reduce Cr(VI) within the coating.