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    • Showing only topics in ~engineering with the tag "ask.experts". Back to normal view / Search all groups

    1. Any experts on electrophoretic lacquer here? Need some help in sourcing a high quality lacquer.

      Ask
      Need to apply lacquer on a mild steel product that is zinc plated and has some vibratory surface polishing on top of it, which wears the zinc down a bit. Need to pass 500 hours on a British...

      Need to apply lacquer on a mild steel product that is zinc plated and has some vibratory surface polishing on top of it, which wears the zinc down a bit.

      Need to pass 500 hours on a British Standard salt spray test (BS EN ISO 9227: 2017)

      If anyone has any sources on a good lacquer supplier please let me know. Tried one by LVH coatings but it didn't pass more than 300 hours.

      12 votes

    2. Any powdercoating experts here? Facing issues with powdercoating on top of zinc plated mild steel.

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      I've been having issues with powdercoating on top of zinc plated mild steel sometimes. Have issues like small dots visible instead of a smooth texture. It looks like how a zit or pimple looks on...

      I've been having issues with powdercoating on top of zinc plated mild steel sometimes. Have issues like small dots visible instead of a smooth texture.

      It looks like how a zit or pimple looks on the skin.

      After zinc plating, it is pre heated for 15 mins at 150 degrees celsius. Then sand it with some 80 no sandpaper. Finally powder coat it and cure it again for 20 mins.

      Amy inputs would be appreciated. Thanks guys.

      Attached some images below:

      https://cubeupload.com/im/Temporalator/Screenshot2024061610.jpg

      https://cubeupload.com/im/Temporalator/18bScreenshot2024061610.jpg

      Edit:
      Hi guys, I posted recently about facing issues with powdercoating zinc plated mild steel. And I'm really thankful for all the responses I got. The zit like small dots I had last time were pretty much solved with outgassing.

      I am now facing another issue where the product has sort of tiny indents or pinholes. I can get my nail in them. Shared some photos below. If you guys could shed some light on what these are and why this is happening despite outgassing, it would be great.

      Currently outgassing the parts at 250 degrees celsius for 30 mins. The curing temperature after that is 200 degrees celsius for 20 mins.

      https://cubeupload.com/im/Temporalator/WhatsAppImage2024062.jpeg

      https://cubeupload.com/im/Temporalator/f15WhatsAppImage2024062.jpeg

      https://cubeupload.com/im/Temporalator/15eWhatsAppImage2024062.jpeg

      https://cubeupload.com/im/Temporalator/9caWhatsAppImage2024062.jpeg

      Thanks everyone.

      29 votes

    4. What are the differences between the Autobahnen and the Interstate Highway System?

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      I know there are some Germans on Tildes, figure at least one of y’all might know. How does a typical Autobahn differ from a typical Interstate in design and construction? How often is repair work...

      I know there are some Germans on Tildes, figure at least one of y’all might know. How does a typical Autobahn differ from a typical Interstate in design and construction? How often is repair work done and how long does it last? What work would be required to upgrade an Interstate to Autobahn standards?

      7 votes