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  1. cooblacrouse

    Passivation of Nitronic 60 Stainless Steel

    Could someone tell me if I can passivate Nitronic 60, UNS21800, and if so which type I should use from the ASTM-A-967 spec? Thank you, Bob
  2. cooblacrouse

    Black Anodizing 7075 Aluminum

    We had 2 lot of parts sent out to be Black Anodized per MIL-A-8625, Type II, Class 2 with a thickness of .0002 to .0004 in. One lot was our tpical material for the part 6061-T651, the other lot the material was swithced to 7075-T651. We allow for 1/2 of the build-up per surface and the parts...
  3. cooblacrouse

    Masking for Electrostatic Powder Coated parts.

    We are currently having problems with masking Electrostatic Powder Coated parts. Hand masking with teflon tape is too expensive. We made plastic masks of a material recommended by the Coater but they melted in the 400 deg F bake. Then we made Stainless Steel masks but where the coating...
  4. cooblacrouse

    Making for Electrostatic Powder Coated parts.

    We are currently having problems with masking Electrostatic Powder Coated parts. Hand masking with teflon tape is too expensive. We made plastic masks of a material recommended by the Coater but they melted in the 400 deg F bake. Then we made Stainless Steel masks but where the coating...
  5. cooblacrouse

    Passivation of 440C

    I have currently run into a problem with passivation of 440C. We have a customer who requires this material and passivation per QQ-P-35,Type II. In the spec there are warnings about possible etching when passivating 440C. We had one lot of parts processed without a problem. The next lot came...
  6. cooblacrouse

    GDT for round parts

    My company manufactures predominantly hollow round parts. I am fairly new to the field and have been seeing inconsistencies in historical drawings when it comes to geometric dimensioning and tolerancing. The only answers I seem to get in house is to copy what was done on previous drawings. As...

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