Method of making electric immersion heaters

Details Method of making electric immersion heaters Method of making electric immersion heaters

1975-08-11

1976-08-31

DiPalma, Victor A.

Metal working

Method of mechanical manufacture

Electrical device making

204 33, 219316, 219335, 427123, 427328, 427405, 427436, H05B 310, H05B 382

Patent

active

039770737

ABSTRACT:
The method of providing a corrosion-resistant coating on the aluminum sheath of an electric immersion heater, comprising the steps of treating the sheath with a nitric acid solution to put a uniform layer of oxide on the exterior sheath surface, then treating the sheath with a caustic tin-bearing solution to strip all oxide from said exterior surface and replace it with a uniform layer of tin, then depositing a uniform layer of bronze over the tin layer, and finally depositing a layer of tin over the bronze coating.

REFERENCES:
patent: 2377606 (1945-06-01), Blackmun et al.
patent: 2670529 (1954-03-01), Thomas
patent: 2785270 (1957-03-01), Burger
patent: 2947639 (1960-08-01), Balden
patent: 3108006 (1963-10-01), Kenedi et al.
patent: 3455014 (1969-07-01), Beyer
patent: 3778592 (1973-12-01), Williams
patent: 3881999 (1975-05-01), Toth et al.

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