Method of surface treatment of aluminum killed steel in preparation for porcelain coating
US4567067A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 24, 1985 |
| Grant date | Jan 28, 1986 |
| Priority date | — |
| Expiry date | Apr 24, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23D3/00
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A surface treatment process for parts fabricated of aluminum killed steel in preparation for porcelain coating wherein the parts are subjected to a plurality of sequential liquid spraying treatments as follows: PA0 (1) An aqueous alkaline cleaning solution at a temperature of about 180.degree. F. (about 82.degree. C.); PA0 (2) A first water rinse; PA0 (3) An aqueous ferric sulfate solution having a concentration of from about 0.5% to about 1% and a temperature of from about 155.degree. F. to about 160.degree. F. (about 68.degree. C. to about 71.degree. C.); PA0 (4) A second water rinse; PA0 (5) An aqueous sulfuric acid solution having a concentration of about 2.5% and a temperature of about 140.degree. F. (about 60.degree. C.); PA0 (6) A third water rinse; PA0 (7) An aqueous nickel sulfate solution having a nickel concentration of from about 2 to about 2.5 oz./gal. and a temperature of about 150.degree. F. (about 65.degree. C); PA0 (8) An aqueous sulfuric acid solution having a concentration of about 0.35% to about 0.45% and a temperature of from about 130.degree. F. (54.degree. C.) to about 140.degree. F. (60.degree. C.); PA0 (9) An alkaline neutralizer spray; and PA0 (10) A fourt…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.