Process for plating adherent co-deposit of aluminum, zinc, and t

Details Process for plating adherent co-deposit of aluminum, zinc, and t Process for plating adherent co-deposit of aluminum, zinc, and t

1988-07-15

1989-11-14

Chambers, A. Michael

Receptacles

Container attachment or adjunct

Pressure relief means

427242, 118418, B65D 610

Patent

active

048801321

ABSTRACT:
A co-deposit of aluminum, zinc and tin can be deposited onto metallic substrates including small metal parts, and the co-deposit is strongly adherent to the substrate and exhibits improved corrosion resistant properties. The co-deposits are plated onto metallic substrates by a process which comprises the steps of a. preparing the substrate to receive the co-deposit, b. forming a slurry comprising a soluble source of stannous ions, impact media, and aluminum and zinc in particulate form in a liquid medium maintained at a pH below about 4, c. mechanically impacting the slurry against the surface of the metallic substrate in a plating container to plate a co-deposit of tin, aluminum and zinc on a metal surface, d. renewing the stannous ions, aluminum and zinc in the slurry while maintaining the pH of the slurry below about 4 throughout the plating process until a co-deposit of the desired thickness is obtained. The invention also includes metallic substrates plated with the co-deposit of aluminum, zinc, and tin in accordance with the process of the present invention as well as slurry compositions which are useful in plating such co-deposits on metal substrates. The invention also includes metal fasteners plated with said co-deposits in contact with aluminum articles to be fastened. An improved apparatus also is described and claimed for carrying out the process of the invention.

REFERENCES:
patent: 3443715 (1969-05-01), Edwards
patent: 3557827 (1971-01-01), Marsh
patent: 4359167 (1982-11-01), Fouss et al.

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