Procedure for depositing a protective precoating on surfaces of

Details Procedure for depositing a protective precoating on surfaces of Procedure for depositing a protective precoating on surfaces of

1976-06-21

1978-08-29

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

106 1412, 148 315, 148 615R, C23F 708

Patent

active

041101278

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, per liter of final solution, of 1 to 40 grams of sodium metasilicate, 14 to 40 milliliters of phosphoric acid, density 1.71 g/ml, 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: 3108012 (1963-10-01), Curtis
patent: 3144360 (1964-08-01), Palm
patent: 3523043 (1970-08-01), Newell et al.
patent: 3592701 (1971-07-01), Pekav
patent: 3597283 (1971-08-01), Snee
patent: 3634286 (1972-01-01), Yates
patent: 3917648 (1975-11-01), McLeod
Zinc Research Digest #30, pp. 27-28, Int. Lead Zinc Research Organization.
Zinc Research Digest #31, p. 42.
Piatti, Korrosion X, 1958, pp. 31-35 (Verlag Chemie GmbH, Weinheim West Germany).
Hatch, Materials Protection, Nov. 1969, pp. 31-35.

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