Chemistry: electrical and wave energy – Processes and products
Patent
1990-09-20
1991-06-11
Niebling, John F.
Chemistry: electrical and wave energy
Processes and products
204 561, C25D 706, C25D 1138
Patent
active
050229680
ABSTRACT:
A technique for improving the tarnish and oxidation resistance of copper and copper based alloy materials is disclosed. Copper or a copper alloy is immersed in an aqueous solution containing sodium hydroxide, zinc ions and chromium (VI) ions. While the compositional ranges may vary, the concentration of either zinc ions or chromium (VI) ions, or both, is less than 1.0 gm/l. A chromium-zinc coating is electrolytically applied. The coating provides tarnish resistance at temperatures in excess of 190.degree. C. The coating is removable by immersion in sulfuric acid. Improved results are obtained by rinsing deionized water containing a small amount of an alkaline or alkaline earth hydroxide.
REFERENCES:
patent: 2080891 (1935-02-01), McDonald et al.
patent: 2412543 (1946-12-01), Tanner
patent: 2418608 (1947-05-01), Thompson et al.
patent: 2647865 (1953-08-01), Freud et al.
patent: 3106484 (1961-01-01), Miller
patent: 3323881 (1963-11-01), Nelson et al.
patent: 3585010 (1971-06-01), Lace et al.
patent: 3625844 (1971-12-01), McKean
patent: 3677828 (1972-07-01), Caule
patent: 3716427 (1973-02-01), Caule
patent: 3764400 (1973-09-01), Caule
patent: 3853716 (1974-12-01), Yates et al.
patent: 3857681 (1974-12-01), Yates et al.
patent: 3857683 (1974-12-01), Castonguay
patent: 4043381 (1977-09-01), Adaniya et al.
patent: 4048381 (1977-09-01), Adaniya et al.
patent: 4049481 (1977-11-01), Morisaki
patent: 4064320 (1977-12-01), Adaniya et al.
patent: 4131517 (1978-12-01), Mitumo et al.
patent: 4376154 (1983-03-01), Nakatsugawa
patent: 4386139 (1983-05-01), Nakatsugawa
patent: 4387006 (1983-06-01), Kajiwara et al.
patent: 4407900 (1983-10-01), Kirihara et al.
patent: 4432846 (1984-02-01), Honeycutt, III
patent: 4456508 (1984-06-01), Torday et al.
patent: 4468293 (1984-08-01), Polan et al.
patent: 4495008 (1985-01-01), Bruno et al.
patent: 4515671 (1985-05-01), Polan et al.
patent: 4572768 (1986-02-01), Wolski et al.
patent: 4640747 (1987-02-01), Ueno et al.
patent: 4647315 (1987-03-01), Parthasarathi et al.
patent: 4702802 (1987-10-01), Umino et al.
patent: 4816142 (1974-06-01), Lindemann
Chao Chung-Yao
Lin Lifun
Mayekar Kishor
Niebling John F.
Olin Corporation
Rosenblatt Gregory S.
Weinstein Paul
LandOfFree
Method and composition for depositing a chromium-zinc anti-tarni does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and composition for depositing a chromium-zinc anti-tarni, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and composition for depositing a chromium-zinc anti-tarni will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-781168