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How to etch Elgiloy (metal)?

 

Hi,

I am working in a metal etching company and use ferric chloride for a etchant. Now I got a problem, we got a metal called Elgiloy which contained 40% of Cobalt (CO), very hard material but we are unable to etch this material, ferric chloride won't touch it, can anyone tell me the way to etch this metal.

Thank You.

Albert Tsang
- England, U.K.

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For metallographic purposes, 15 volumes hydrochloric acid plus 10 volumes nitric acid plus 10 volumes acetic acid has been recommended, with the advice to mix fresh, swab onto the surface (rather than immerse) (4 minutes stated to be OK) and don't store used etchant. Maybe it'll work for your application. I'd be providing some very good ventilation!

Bill Reynolds [deceased]
consultant metallurgist - Ballarat, Victoria, Australia
We sadly relate the news that Bill passed away on Jan. 29, 2010.