Solution and procedure for depositing a protective precoating on

Details Solution and procedure for depositing a protective precoating on Solution and procedure for depositing a protective precoating on

1977-12-23

1978-11-21

Lieberman, Allan

Compositions: coating or plastic

Coating or plastic compositions

Corrosion inhibiting coating composition

106286, 106316, 148 615Z, 252389A, 427344, C09D 508, C23F 712, C23F 1108

Patent

active

041264690

ABSTRACT:
Solution and procedure of depositing a coating on the surfaces of zinc-coated ferrous metal parts which protects against corrosion in the presence of water. The solution is made up by adding to water, perliter of final solution, of 1 to 40 grams of sodium metasilicate, 14 to 40 milliliters of phosphoric acid, specific gravity 1.71, from 1 to 40 grams of sodium nitrate, from 10 to 50 grams of anhydrous zinc chloride and the pH is adjusted to a value between 2.3 and 3.8. Preferably nickel chloride is added. For use, the solution is heated to a temperature ranging from 15.degree. to 75.degree. C and brought into contact with the parts to be treated for a period from 20 to 72 hours. The deposit is continuous, hard, resistant to shocks and abrasion and imparts an efficient and lasting protection to galvanized parts in corrosive waters. The invention is useful for the protection of piping in the building industry.

REFERENCES:
patent: 2121574 (1938-06-01), Romig
patent: 2743205 (1956-04-01), Condon
patent: 2835617 (1958-05-01), Maurer
patent: 3144360 (1964-08-01), Palm
patent: 3523043 (1970-08-01), Newell et al.
patent: 3592701 (1971-07-01), Pekar
patent: 3597283 (1971-08-01), Snee
patent: 3634286 (1972-01-01), Yates
patent: 3917648 (1975-11-01), McLeod
Piatti, "Passivierung und Schutzschietenbildung in Aufbereiten Wassern", Korrosion X, (Verlag Chemie GmbH, Weinheim, West Germany) 1958, pp. 31-35.
Hatch, Polyphosphate Inhibitors in Potable Water, Materials Protection, Nov. 1969, pp. 31-35.
Zinc Research Digest No. 30, International Lead Zinc Research Organization, Inc., N.Y.C., Mar. 26, 1973, pp. 27 & 28.
Zinc Research Digest No. 31.
Ibid, Aug. 17, 1973, p. 42.

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