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Passivation for CPM S-30V involves boiling in either hydrachloric or sulphuric acid (need to check, can't remember which) for a period of time. This removes the surface imbedded impurities from any machining process or sandblasting. The result is supposed to be a very clean white surface. This is too dangerous a setup for me to do in this shop. Too many problems associated with using hot acid. (edited because of my usual spelling skills)
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