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  • Users: metrat23
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  1. metrat23

    Sodium Hydroxide

    I'm trying to mix a solution of sodium hydroxide flakes in water, to achieve a concentration of about 5%. Can I verify this concentration by a hydrometer, pH or is there a titration I can use? Any feedback would be appreciated. Thanks
  2. metrat23

    NDT - Nital Etch

    Is there a titration to verify the nitric concentration in a nitric - ethanol solution?
  3. metrat23

    Base metal black oxide interaction

    I black oxide treat a casting made of 8620 steel. Periodically, the parts exhibit a redish color. I've been told that it is most likely cause by an interaction between the black oxide salts and the silicon content in the material. I've verified the silicon content is it's only about 0.3 wt%...
  4. metrat23

    Black Oxide Process

    I sometimes get cloudy finishes on parts I run after I change my black oxide tank. Is there an activation or start up procedure I should go through with a new soltuion? After I run it for a few days it looks great. Any information would be appreciated.

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