Nitrohydrofluoric development bath for titanium alloy components

Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge

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C25F 308

Patent

active

052270351

ABSTRACT:
A nitrohydrofluoric development bath for use in an electro-chemical etching rocess, known as the "blue etch process", for the non-destructive inspection of titanium or titanium alloy components such as turbo-machine blades and discs, the bath comprising, per liter, 320 g of nitric acid, from 13 to 22 g of hydrofluoric acid, from 4 to 7 g of dissolved titanium, and water as the balance.

REFERENCES:
patent: 3502552 (1970-03-01), Mizushima et al.

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