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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. stonerabroad

    material suggestions for high CO2 and low H2S environments

    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. considering we're making pressure vessels out of the material, it must be...
  7. stonerabroad

    Chromate or Phosphate??

    i'm looking at specifying a conversion coating on some mild steel vessels. currently, our supplier is using an iron phosphate as the 'primer' then is powdercoating the exterior, a common practice. the corrosion resistance is insufficient though, because after storing or operating these...
  8. stonerabroad

    Materials used in H2 PSA systems

    can anyone tell me what the components of Linde or UOP PSA systems are made from...vessels, piping, valve materials. we've got a rotary valve made from mild steel that we're about to nickel plate for corrosion resistance. stainless is the other option, but we'd like to compare our solutions...
  9. stonerabroad

    bonding to electroless nickel

    will a 2 part epoxy bond to electroless nickel, with 6% P?
  10. stonerabroad

    Cadmium chemical compatibility

    i'm doing a chemical compatibility study a machine we're producing around here. in that machine we've got mild steel parts that have been cadmium coated for corrosion resistance. when cad plating was chosen, all scenarios were not considered and we're now evaluating alternatives. of course we...
  11. stonerabroad

    Cadmium chemical compatibility

    i'm doing a chemical compatibility study a machine we're producing around here. in that machine we've got mild steel parts that have been cadmium coated for corrosion resistance. when cad plating was chosen, all scenarios were not considered and we're now evaluating alternatives. of course we...
  12. stonerabroad

    corrosion of mild steel tanks

    we've got CO and CO2 concentrations accounting for about 65% of our gas stream and the remainder H2, in a 100% RH environment. operating temperatures are 30 to 40 degrees C and the pressures around 130PSIG. we've got mild steel vessels and everything that i find implies we may have a carbonic...

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