Composition for chemical conversion treatment and member having a chemical conversion coating formed by the treatment
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 23, 2014
Issued Date -
N/A
app pub date -
Sep 3, 2008
filing date -
Sep 3, 2007
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The object of this present invention is to provide novel means for inhibiting elution of hexavalent chromium from a chemical conversion coating. A composition for chemical conversion treatment comprises at least 0.1 g/L of a polyphenol and at least 1.5 g/L in chromium ion equivalent of an aqueous trivalent chromium compound and has a pH of 6 or less. A chemical conversion coating formed on a metallic surface of a member by contacting the surface with the composition for chemical conversion treatment has a hexavalent chromium content of 0.04 μg/cm2 or less after exposure to an environment having a temperature of 80 degrees C. and a relative humidity of 100% for 120 hours. The content of hexavalent chromium is measured by a method compliant with EN15205. A composition containing at least 0.1 g/L of a polyphenol can be used as a composition for post-coating treatment of a chemical conversion coating obtained by conventional chemical conversion treatment.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully