A little confused on the galanized steel subject.

Discussion in 'Fridge/Freezer Builds' started by scrappynadds, Mar 25, 2012.

  1. scrappynadds

    scrappynadds Smoking Fanatic

    I'm in the process of a fridge build (pictures to follow shortly) and I'm going to use a replacement element from a Brinkmann bullet type smoker (1500 watt) and when I opened the box the element is attached to a plate of galvanized steel which fits  down inside the smoker per the directions. I know I have seen on SMF where people are very adamant about never using galvanized steel in a smoker. So the question is "if galvanized steel is a no no then why is Brinkmann using it and if Brinkmann thinks it safe why do most people say you should not use it. I do realize that galvanize is unsafe at a certain temp but will a smoker which will only see 350 degrees max need to worry about it......... Should I remove the galvanize plate and replace it with stainless????
     
  2. boykjo

    boykjo Sausage maker Staff Member Moderator Group Lead OTBS Member

    Last edited: Mar 25, 2012
  3. scrappynadds

    scrappynadds Smoking Fanatic

    Great........Thanks for the help......I have been finding it hard to find pipe which is alum for my exhaust put I have galvanized eveywhere thanks again........
     
  4. smokeamotive

    smokeamotive Smoking Fanatic

    You can use aluminum conduit or you can go to a home center and get some SS flue pipe. 
     
  5. No worries, zinc must be heated above 1665 degrees F to vaporize, combine with oxygen and form zinc oxide.
     
    Last edited: Mar 25, 2012
  6. boykjo

    boykjo Sausage maker Staff Member Moderator Group Lead OTBS Member

    So if Zincs melting point it 787.15 degrees and its boiling point is 1665 degrees. It is ok to say no harmful vapors will happen below 1665 degrees. heat of vaporization is 123.6 kJ·mol−1 whatever that is..........

    Not what I was teached.... I Mite need to be re-ejumicated......[​IMG]

    Joe
     
  7. Yeah, the melting point is 787. When I worked in a foundry the zinc for hot dipped galvanizing was kept at right around 800 degrees, no irritating fumes from that!! :biggrin:
    The temp must hit the 1665 for it to vaporize, that happens in welding, etc.
     
  8. FWIW, Here's a video of a hot-dipped galvanizing zinc bath, much the same as it was in the foundry.
    As you can see, there's no special respiratory protection required.

     
  9. boykjo

    boykjo Sausage maker Staff Member Moderator Group Lead OTBS Member

    Just found this in a wiki for hot dip galvanizing.

    The process of hot-dip galvanizing results in a metallurgical bond between zinc and steel with a series of distinct iron-zinc alloys. The resulting coated steel can be used in much the same way as uncoated. Galvanized steel can be welded; however, one must exercise caution around the resulting zinc fumes. Galvanized steel is suitable for high-temperature applications of up to 392°F (200°C). The use of galvanized steel at temperatures above this will result in peeling of the zinc at the intermetallic layer. Electrogalvanized sheet steel is often used in automotive manufacturing to enhance the corrosion performance of exterior body panels, this is however a completely different process

    intermetallic layer
    Refers to the actual bond formed in soldering from the interdiffusion of two or more metals (e.g. copper/tin). The intermetallic layer is the most brittle part of the joint, and increases in depth in logarithmic proportion to both time and temperature during the soldering process. (Staying on the j...

    Could this be a problem if it is near the food.... what are your thoughts. I also read that galvanizing in some cases is only 90% zinc.

    Joe
     
  10. I wouldn't want anything foreign flaking off and falling into my food.
     
    Last edited: Mar 26, 2012

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