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Recent content by stonerabroad

  1. stonerabroad

    Is lubrication necessary for polymer bushings?

    to make it easier...try this http://www.igus.com/iglide.asp
  2. stonerabroad

    Is lubrication necessary for polymer bushings?

    Yes, do check with the supplier as to whether they recommend lubrication of the bushing. lubrication will depend on operating conditions and desired life. and if they do recommend, ensure you clarify exactly what lubricants are compatible. the last thing you want to find is the lubricant...
  3. stonerabroad

    Coating Question

    chrome plating is a very hard brittle coating. although wear resistant, it too will flake off over time with repeated impacts. since the coating is so hard, it develops microcracks which propagate through rather quickly. although pretty, it requires copper or nickel prestrikes to get a...
  4. stonerabroad

    Phosphate degradation?

    i've got an application that we're currently specifying both iron phosphate and zinc phosphate. the coating is being used on surge tanks to act as a primer on the outside of the tank, and as a mild corrosion preventer on the inside. the outside of the tank is powder coated for evironmental...
  5. stonerabroad

    electroless nickel plating over welded mild steel?

    as an update for everyone following this thread, the parts have been sectioned and a little more information obtained from the fabricator. the cracked weld was a result of 1. poor set up, a third spacer ring was created by the fabricator and not fully penetrated during welding 2. no preheat was...
  6. stonerabroad

    electroless nickel plating over welded mild steel?

    as for EN process conditions, the plating bath was at 165F and the rinse at around 100F. the parts were allowed to cool to room temperature after that. as for the welding, a standard was used that required the parts to be preheated only to 70F (note that i'm emailing from canada and shop...
  7. stonerabroad

    electroless nickel plating over welded mild steel?

    the small cracks noted were through the welds. hydrostatic pressure testing of the welded assembly prior to plating was done and passed. a second pressure test was done after plating and cracks through the welds were noted. as a result, the part failed. and simply due to the circumstances it...
  8. stonerabroad

    electroless nickel plating over welded mild steel?

    we've just welded up some mild steel flanges (1018/1020) to an A53 pipe, then electroless nickel plated the assembly. small cracks have been noted in the final piece and questions are arising as to whether it was the welding process that created the cracks, or the post-weld plating. has anyone...
  9. stonerabroad

    mixed reactions and corrosive environments?

    thanks grumpus. at concentrations of only 50PPM though, would these reactions occur?
  10. stonerabroad

    Chromate or Phosphate??

    can you zinc chromate mild steel? our local shops have only really done it on aluminum.
  11. stonerabroad

    4130 for wet CO2 and H2S service

    the compatibility info i've got suggests typical polyester-epoxy powdercoating blends would be adequate for H2S environments. i'll chat with our vendors to determine if coating the inside is a possibility.
  12. stonerabroad

    4130 for wet CO2 and H2S service

    hush, by polymer coating i'm assuming you mean a powder coat, or a polymer lining. i'm uncertain of how you'd line these as vessels. powdercoating the inside could be uneven and would require QA.
  13. stonerabroad

    mixed reactions and corrosive environments?

    could anyone tell me of mixed reactions between CO2, H2, H2S and water that could create a corrosive environment in contact with mild steel? CO2 readily dissolves in H2O to make carbonic acid, at room temperature. does H2S dissolve to form sulfuric acid? at temperatures of around 60C and...
  14. stonerabroad

    reactions of CO2, H2, H2S, and water...under pressure

    could anyone tell me of mixed reactions between CO2, H2, H2S and water that could create a corrosive environment in contact with mild steel? CO2 readily dissolves in H2O to make carbonic acid, at room temperature. does H2S dissolve to form sulfuric acid? at temperatures of around 60C and...
  15. stonerabroad

    4130 for wet CO2 and H2S service

    just looking for material suggestions for a gaseous environment operating at 300PSI. it's currently about 50% CO2 and 50% H2 were processing, with only around 50PPM H2S. the gas stream is also humid, 100%RH. temperature is around 60C considering we're making pressure vessels out of the...
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