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Acid etching of 316 stainless steel for adhesive bonding

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Hello, I am trying to find the best method for etching .005 - .008 316 stainless steel for bonding. We have been using a sulfuric/oxalic acid mix, but can't seem to get the peel torque where it's supposed to be. Any help would be wonderful.

Thanks,

Tom Haggerty
Aerospace - Boerne, Texas, US

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