Chem-milling of titanium and refractory metals

Details Chem-milling of titanium and refractory metals Chem-milling of titanium and refractory metals

1977-09-06

1978-09-26

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156664, 252 793, 252 794, C23F 102

Patent

active

041167554

ABSTRACT:
An improved composition and process for chemically milling titanium, refractory metals, and their alloys, resulting in decreased absorption of hydrogen, thus allowing chemical milling of beta titanium and alpha beta titanium, which normally cannot be chemically milled in conventional chemical milling solutions because of hydrogen embrittlement.
The chemical milling solution itself consists of a mixture of nitric acid; hydrofluoric acid or fluoride salts; derivatives of carbonic acid, such as carbamide; derivatives of monocarboxylic acids containing alkali metal ions, such as sodium benzoate; and a source of sodium ions compatible with the remainder of the composition, preferably sodium nitrate.
The addition of sodium benzoate results in a more uniform metal removal rate, thus permitting the producing of high precision parts.

REFERENCES:
patent: 3166444 (1965-01-01), Ehren et al.
patent: 3491027 (1970-01-01), Baker
patent: 3749618 (1973-07-01), Fannin et al.
patent: 3788914 (1974-01-01), Gumbelevicius

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