Aqueous acidic composition for forming chromium-containing chemical conversion coating on iron-based member, and iron-based member having chemical conversion coating formed using the composition
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 24, 2017
Issued Date -
N/A
app pub date -
Jan 15, 2014
filing date -
Jul 15, 2011
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An aqueous acidic composition is provided for forming a chromium-containing chemical conversion coating on a member having an iron-based metal surface. The composition contains a water-soluble trivalent chromium-containing substance, a water-soluble zinc-containing substance, and a water-soluble polyvalent carboxylic acid compound. On the total composition basis, the water-soluble trivalent chromium-containing substance has a content of 60 mmol/L or more in terms of chromium, the water-soluble zinc-containing substance has a molar content in terms of zinc such that a ratio of the content is 0.6 or more to a molar content in terms of chromium of the water-soluble trivalent chromium-containing substance, and the water-soluble polyvalent carboxylic acid compound has a content of 55 mmol/L or more in terms of polyvalent carboxylic acid. The composition is free from allylamine, polyallylamine, aromatic sulphonic acid, aromatic sulphonic acid-formaldehyde condensate, and derivatives thereof, and fluorine-based substance, hexavalent chromium-containing substance, and film-forming organic component.
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