COMPOSITE COATING FOR ELIMINATING POLLUTION BY HEAVY METAL CHROMIUM AND VOCS FROM SOURCE AND PREPARATION METHOD
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United States of America Patent
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Issued Date -
Dec 22, 2022
app pub date -
Feb 24, 2020
filing date -
Feb 24, 2020
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Abstract
Disclosed is a composite coating for eliminating pollution by chromium and VOCs from a source, the coating comprising a conversion film layer and a coating surface layer. The conversion film layer is made of a surface pretreatment liquid, and the surface pretreatment liquid comprises the following components: an organic compound A having an aromatic ring and at least two phenolic hydroxyl groups in the molecule thereof, or a hydrate thereof; an ionic compound B containing zirconium and/or titanium and fluorine; a mixed solution C containing manganese fluoride; and an inorganic salt D containing potassium ions or sodium ions. The coating surface layer is an FEVE-type fluorocarbon powder coating layer. Also disclosed is a preparation method for the described composite coating.
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