Claims
- 1. A method of treating steel sheets which have good corrosion resistance after forming, which comprises coating a steel sheet with an effective amount to inhibit corrosion, of a solution which consists essentially of water and:
- (a) water-soluble or water-dispersible lithium silicate at a concentration of 2 to 250 g/l, which lithium silicate is a mixture of silicic acid or silicate and lithium salt in a molar ratio of 20:1 to 1:1,
- (b) at least one water-soluble or water-dispersible saturated or unsaturated fatty acid compound, higher alcohol wax, polyethylene type resin, or silicone type resin at a concentration of 1 to 250 g/l,
- (c) at least one water-soluble phosphate or phosphoric acid at a concentration of 1 to 100 g/l.
- 2. A method of treating steel sheets according to claim 1 wherein said lithium salt is lithium hydroxide.
- 3. A method according to claim 1 wherein there is employed phosphate selected from the group consisting of monosodium hydrogen phosphate, disodium hydrogen phosphate, ammonium phosphate or potassium phosphate.
- 4. A method of treating metal sheets according to claim 1 wherein the steel is plated with a metal selected from the group consisting of zinc, chromium, tin, copper, nickel or aluminum.
- 5. A method according to claim 1 wherein the sheet is a cold-rolled steel sheet.
- 6. A method according to claim 1 wherein silicate is selected from the group consisting of potasium or sodium silicate.
- 7. A method according to claim 1 wherein the fatty acid compound is employed and said compound is selected from the group consisting of stearates, palmitates, myristates, oleates and linolates.
- 8. A method according to claim 1 wherein an alcohol-type wax is employed and said wax is selected from the group consisting of melissyl alchol, tetracosanol and stearyl alcohol.
- 9. A method according to claim 1 wherein a polyethylene type resin is employed and said resin has a molecular weight of 5,000 to 40,000.
- 10. A method according to claim 1 wherein a silicone-type resin is employed and said resin is selected from the group consisting of dimethylpolysiloxanes, methylhydrogen polysiloxanes and silicone alkyd varnish.
- 11. A method according to claim 1 wherein the steel sheet is dried immediately after coating.
- 12. The steel sheet produced by the process of claim 11.
- 13. A method according to claim 11 wherein the treated steel sheet is forced dried at a temperature of from 80.degree. C. to 200.degree. C.
Priority Claims (1)
Number |
Date |
Country |
Kind |
50-151993 |
Dec 1975 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 701,605, filed July 1, 1976 and now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
2699407 |
Martens et al. |
Jan 1955 |
|
Non-Patent Literature Citations (1)
Entry |
Baker et al., Polar Type Rust Inhibitors, pp. 137-144. |
Continuations (1)
|
Number |
Date |
Country |
Parent |
701605 |
Jul 1976 |
|