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  1. coatingengineer

    APET Heat Stability

    Can you help me understand the temperature limitation of APET? Specifically, why is it that APET-packaged foods can be heated in a microwave only, when CPET-packaged foods are heated in either a household bake oven or microwave? Does economics drive the growing preference for APET over CPET in...
  2. coatingengineer

    Steel - Nitric Acid Exposure

    You're welcome. Glad to help. For rust removal, there is always shot peen, grit blast, or other mechanical removal. Chemical cleaners are also available that can remove rust and form new, stable oxides in their place. William Gunnar Naschak http://www.IndustrialCoatingsWorld.com...
  3. coatingengineer

    Steel - Nitric Acid Exposure

    Hi. An epoxy or modified epoxy-phenolic coating will serve you well. Consider Heresite Protective Coatings: http://www.heresite.com. William Gunnar Naschak http://www.IndustrialCoatingsWorld.com http://www.nationalsurfacesolutions.com http://www.industrialcoatingsworld.com
  4. coatingengineer

    High temperature - high emissivity coating

    Hello, Feldmann. Consider doping your coating (metal finish) with yttrium or an ytterbium-based rare-earth material. Higher band widths, less heat reflection should result. The industry of photonics may be a good place to learn. William Gunnar Naschak http://www.IndustrialCoatingsWorld.com...
  5. coatingengineer

    Motorcyle Fork Low Friction/Wear Surface

    Glad to help. It'd be interesting to know if those significant friction and wear advantages are measured, quantified. Or, maybe others from your industry have testimonials. William Gunnar Naschak http://www.IndustrialCoatingsWorld.com http://www.nationalsurfacesolutions.com...
  6. coatingengineer

    Motorcyle Fork Low Friction/Wear Surface

    Friction is a system-dependent parameter, a function of material, counter-face, hardness, temperature, load, surface finish, distance and rate of travel. If you (or the industry) have seen no wear or performance compromise, there's no sense in pursuing "the better mousetrap". Stick with what...
  7. coatingengineer

    Motorcyle Fork Low Friction/Wear Surface

    Hello. Sounds like you have yet to see "failure mode", yourself, using conventional surface treatments like hard chrome. Nevertheless, there may be some advantages. Specifically, in boundary lubrication (e.g. oil environments), PTFE can serve you well in overcoming static friction and periodic...
  8. coatingengineer

    PTFE and Anodized Aluminium Surfaces

    Hello. Sounds like you have yet to see "failure mode", yourself, using conventional surface treatments like hard chrome. Nevertheless, there may be some advantages. Specifically, in boundary lubrication (e.g. oil environments), PTFE can serve you well in overcoming static friction and...
  9. coatingengineer

    Need abrasive resistant coating for polycarbonate

    Hi, Richard. Consider perfluoropolyether technology from Solvay. Here is their link: http://www.solvaysites.com/sites/solvayplastics/EN/specialty_polymers/Fluorinated_Fluids/Pages/Fluorolink_PFPE.aspx Best wishes. William Gunnar http://www.IndustrialCoatingsWorld.com...
  10. coatingengineer

    Stripping Chromium Nitride (CrN) from Carbide

    Anyone successful in stripping chromium nitride coatings from carbide? No changes in surface finish are permissible. Nor are reductions in cobalt. William Gunnar http://www.IndustrialCoatingsWorld.com
  11. coatingengineer

    Stripping Chromium Nitride (CrN) from Carbide

    Anyone successful in stripping chromium nitride coatings from carbide? No changes in surface finish are permissible. Nor are reductions in cobalt. William Gunnar http://www.IndustrialCoatingsWorld.com
  12. coatingengineer

    Design for PFA or other fluoropolymer welding - need tips

    Hello. My experience is coating-related. PFA, being melt-processable, monolithic, lends itself well to "joining" through heat. But, like other fluoropolymers, ETFE included, be sure to weld in a well ventilated area. In fact, DuPont will even recommend a self-contained breathing apparatus...
  13. coatingengineer

    Machining Thermal Spray Coating

    Great advice by unclesyd. Also, can you add a radius to that corner? Thermal spray adhesion, you've discovered, is poor on sharp edges. William Gunnar http://www.IndustrialCoatingsWorld.com http://www.industrialcoatingsworld.com
  14. coatingengineer

    Test to Determine Water Penetration Through Coating

    Great advice by all. Consider, too, weight gain by your film. This would require smaller test samples, and an analytical scale with capability to 0.0001 gram. Best wishes. William Gunnar http://www.IndustrialCoatingsWorld.com http://www.industrialcoatingsworld.com
  15. coatingengineer

    Best anti-wear coating for high strength aluminum?

    Hi. The lubricating aluminum hard coatings originating from ALCOA with <a href="http://www.lukeeng.net/">Luke Engineering & Mfg.</a> would be ideal. They are experts in light metal processing. William Gunnar http://www.IndustrialCoatingsWorld.com http://www.industrialcoatingsworld.com
  16. coatingengineer

    Coating on particles or microcapsules

    Hello, Jinhh. What functionality or physical characteristics do you require from the coating? William Gunnar http://www.IndustrialCoatingsWorld.com http://www.industrialcoatingsworld.com
  17. coatingengineer

    Pickling/passivation stainless steel vessel/tanks UK companies

    Hi. If by pickling you mean passivate, this is done typically using nitric acid, or the more eco-friendly citric acid. Temperatures are slightly elevated; and both yield excellent results. Of course extensive post-rinsing is required, including de-ionized water, to ensure surface purity...
  18. coatingengineer

    material selection

    Hi. I don't know your mechanical or thermal requirements, but you can't go wrong with 3M's Scotchkote series. These epoxy-based coatings are impressive. I've used them, myself, both for electrical insulation and protection from corrosion. Best wishes. William Gunnar...
  19. coatingengineer

    Surface cracking after liquid nitriding

    Hi. For surface fatigue, the problem may be in the diffusion layer. Alloyed steels can result in thicker carbides or nitrides in grain boundaries, which may initiate cracking. I wish I could be more helpful. But, right now, I wouldn't rule out: process, material, or geometry. William...
  20. coatingengineer

    Painting on cast bronze

    Hi. The copper in your cast bronze will oxidize (and dis-bond) at temperatures below typical heat cures of many epoxy- and phenolic-based paints known for their corrosion resistance. This makes paint adhesion difficult. Consider 3M ScotchKote 134...

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