METHOD OF TREATING A METAL SUBSTRATE
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United States of America Patent
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Issued Date -
Sep 1, 2016
app pub date -
Mar 3, 2014
filing date -
Jul 5, 2013
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Abstract
A method of cleaning a metal substrate, the method comprising exposing the metal substrate to a body of cleaning liquor comprising a cleaning formulation and a multiplicity of solid particles wherein the method further comprises causing the solid particles and the metal substrate to enter into contacting relative movement; wherein i) the cleaning formulation comprises at least one acid which has a pKa greater than about −1.7; and/or ii) the cleaning formulation comprises at least one base which has a pKb greater than about −1.7; and the length of the particles is from about 0.5 mm to about 6 mm.
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