Process of coating metal and resultant product

Details Process of coating metal and resultant product Process of coating metal and resultant product

1974-06-05

1976-12-28

Gwinnell, Harry J.

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

260 296ME, 260 296MM, 260 296MN, 260 296WB, 427379, 427380, 427409, 428463, 428510, B05D 302, B32B 1508

Patent

active

039999572

ABSTRACT:
Metal surfaces moving at high speeds are coated with a chromium-resin containing layer having improved adhesion and resistance to deformation. The coatings provide corrosion resistance to the metal as well as enhancing its appearance when a pigment is added. The improved metal coatings are obtained by processes which apply an aqueous dispersion containing a water soluble dichromate of a metal, a reducing agent for the dichromate consisting of a mixture of a lower alkanolamine and a hexitol, and an acrylic resin mixture consisting of about 5 to 22% by weight of thermosetting acrylic tetrapolymer and 95 to 78% by weight of thermoplastic acrylic copolymer to the metal surface and thereafter heating the metal to evaporate water and form a coating on the metal at a temperature ranging from about 180.degree. to 275.degree. F. and then curing the coating while simultaneously reducing the chromium in the dichromate by heating the metal within the range of about 400.degree. to 500.degree. F. for at least 2 seconds. Coating baths for preparing the chromium-resin coatings on metal as well as concentrates for preparing the coating baths are also disclosed.

REFERENCES:
patent: 2971934 (1961-02-01), Brown et al.
patent: 3053692 (1962-09-01), Pocock
patent: 3053702 (1962-09-01), Schuster et al.
patent: 3346522 (1967-10-01), Schuster et al.
patent: 3382111 (1968-05-01), Tongyai et al.
patent: 3472681 (1969-10-01), Schuster et al.
patent: 3516847 (1970-06-01), Schuster et al.
patent: 3585084 (1971-06-01), Steinbrecher et al.
patent: 3840392 (1974-10-01), Schuster et al.

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