Treatment of zinc surfaces

Cleaning and liquid contact with solids – Processes – For metallic – siliceous – or calcareous basework – including...

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134 3, 134 41, 252149, C03C 2300

Patent

active

041013395

ABSTRACT:
An improved chromium-free zinc surface treatment provides for contacting the surface with an aqueous solution of a thiourea compound and a vegetable tannin at a pH value of from 2 to 6.5. Corrosion resistance and paint receptivity of the surface are enhanced.

REFERENCES:
patent: 2050355 (1936-08-01), McCollam et al.
patent: 2959555 (1960-11-01), Martin et al.
patent: 3294695 (1966-12-01), Tippett
patent: 3468804 (1969-09-01), Perry

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