Method of preparation of the surfaces of products made of iron a

Details Method of preparation of the surfaces of products made of iron a Method of preparation of the surfaces of products made of iron a

1977-12-29

1979-06-19

Smith, John D.

Coating processes

With pretreatment of the base

Fluxing

134 3, 148 23, 148 26, 156664, 427320, 427329, C23C 108, C23C 112

Patent

active

041587103

ABSTRACT:
The work-pieces are mechanically cleaned, degreased and washed, and then etched in an aqueous solution containing 0.5-1.0% by weight of citric acid, and 16-24% by weight of hydrochloric acid, having a temperature of 15.degree.-30.degree. C., preferably of 20.degree.-25.degree. C., for the time of 1-20 minutes, preferably 2-5 minutes, whereafter the work-pieces are neutralized in an aqueous ammonia solution having a concentration not exceeding 1% by weight, at a temperature of 15.degree.-25.degree. C., in a time not shorter than 1 minute. After being washed in water at a temperature not exceeding 35.degree. C. in a time not shorter than 1 minute, they are dipped in an agitated aqueous solution of the flux, containing 1.8-2.5% by weight of potassium fluoride, 0.8-1.5% by weight of sodium fluoride, and 1.5-3.0% by weight of potassium fluorozirconate, having a temperature of 40.degree.-80.degree. C. After at least two minutes of holding in the flux, the work-pieces are dried and finally dipped in a melt of aluminum or alloys thereof. Alternatively a flux having composition 1.5-2.0% by weight of potassium fluoride, 1.5-2.0% by weight of sodium fluoride, 6.0-10.0% by weight of sodium tetraborate and 2.5-5.0% by weight of acetic acid, having a temperature of 15.degree.-40.degree. C. may be used, for a period not shorter than 2 minutes.

REFERENCES:
patent: 2731362 (1956-01-01), Brondyke
patent: 2785084 (1957-03-01), Lundin
patent: 2935419 (1960-05-01), Mitchell
patent: 3793221 (1974-02-01), Otrhalek et al.
patent: 3806356 (1974-04-01), Shoemaker
patent: 3850699 (1974-11-01), Gierek et al.

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