Phosphating solutions and process
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 25, 1984
Grant Date -
N/A
app pub date -
Nov 30, 1983
filing date -
Dec 3, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process for phosphating metal surfaces, particularly iron, steel and zinc-plated steel, by treating them with aqueous, acidic zinc phosphate baths at only moderately elevated temperatures in the range of from 22.degree. to 38.degree. C. The baths used have 2 to 6 g/l of Zn; 4 to 23 g/l of PO.sub.4.sup.3- ; a free acid content of 0.05 to 0.4 points; and a pH-value of 3.0 to 4.0. The ratio of Zn to PO.sub.4.sup.3- is preferably in the range from 1:2 to 1:11. The baths can advantageously contain nickel-(II)-ions, with a nickel content not exceeding a Zn:Ni ratio of 1:0.5. This process gives iron-containing zinc phosphate layers having an iron content of from 5 to 20% by weight and is particularly useful for pretreatment for subsequent cathodic electro-dip-lacquering.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
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