Hot dip galvanizing of carbon steel
Hot dip galvanizing of carbon steel
(OP)
Dear Experts,
I am little confused to understand that ZINK being anodic with respect to carbon steel how it will save carbon steel from corrosion in case of hot dip galvanizing. Rather, the zink layer will get corroded.
Please clarify my understanding on the issue,
Regards
I am little confused to understand that ZINK being anodic with respect to carbon steel how it will save carbon steel from corrosion in case of hot dip galvanizing. Rather, the zink layer will get corroded.
Please clarify my understanding on the issue,
Regards





RE: Hot dip galvanizing of carbon steel
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Hot dip galvanizing of carbon steel
I would recomend checking out this site. Rust is caused by electricy moving around within the part. The zinc coating controls the direction of the current and thus is able to sacrifice itself to save the steel.
RE: Hot dip galvanizing of carbon steel
Hope this helps!
RE: Hot dip galvanizing of carbon steel
RE: Hot dip galvanizing of carbon steel
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Hot dip galvanizing of carbon steel
RE: Hot dip galvanizing of carbon steel
I have some ZRC+epoxy+urethane that have been in service at the fish house since the eighties. There are a few cases where ZRC+chlorinated rubber have lasted even longer.
RE: Hot dip galvanizing of carbon steel
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Hot dip galvanizing of carbon steel
How is the critical concentration of zinc determined? I think most inorganic zinc silicate coatings are about 75-80% zinc, and the zinc filled epoxies are in the order of 60% zinc.
RE: Hot dip galvanizing of carbon steel
RE: Hot dip galvanizing of carbon steel
(1) Organic zinc: +/- attributes (metallic?)
(2) Inorganic zinc: +/- attributes and what is it.
(3) Why zinc and why not something more electronegative such as magnesium or something less electronegaive depending on the electronegativity of the substrate.
Thank you in advance.
RE: Hot dip galvanizing of carbon steel
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Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Hot dip galvanizing of carbon steel
This all applies to new construction, not to maintenance, where inorganic zinc cannot be used.
Hot dipped galvanizing is still the "Cadillac" protection, as there is much more zinc than with the applied coatings.
RE: Hot dip galvanizing of carbon steel
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04