Method for etching apertures into a strip of nickel-iron alloy

Details Method for etching apertures into a strip of nickel-iron alloy Method for etching apertures into a strip of nickel-iron alloy

1984-04-02

1984-11-13

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156642, 156644, 156664, 156345, 252 792, C23F 102, B44C 122, C03C 1500

Patent

active

044824262

ABSTRACT:
A method for etching a strip of iron-nickel alloy, such as invar steel, having etch-resistant stencils on opposite major surfaces thereof includes contacting the stencilled surfaces with a ferric-chloride etchant. The etchant is controlled (a) to contain not more than 5 molar percent nickel ion with respect to the total content of nickel and iron ions, (b) to have a specific gravity greater than about 1.495 (48.degree. Baume) (c) and to have a temperature greater than 70.degree. C.

REFERENCES:
patent: 3788915 (1972-02-01), Gulla
patent: 4061529 (1977-12-01), Goldman et al.
patent: 4389279 (1983-06-01), Weber et al.
patent: 4396475 (1983-08-01), Stehlik
patent: 4420366 (1983-12-01), Oka et al.

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