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How to detect possible intergranular corrosion after pickling of Incoloy 800?

Dear expert,

Could someone tell me how to detect intergranular corrosion on incoloy 800 seamless tubes which has been pickled with HNO3/HF. The idea is detect IGA only with a surface inspection with a 45X lens. I have tried but I can not find any superficial sign, knowing trough metallography, that the tube had suffered IGA.
If you have any suggestion to detect IGA without a metallographic test will be welcome.
Thank you in advance

Diego Delfino
engineer - Buenos Aires, Argentina
June 4, 2010

White light interferometry might possibly work.

Terry Tomt
- Auburn, Washington
June 17, 2010

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