Summary for electro-galvanized vs galvanneal Discussion
Electro-galvanized vs galvanneal is explained as a basic coating-process difference. In the thread, DeAnn McMeekin asks what the terms mean. Ted Mooney answers that electrogalvanized means zinc applied by electroplating, while galvanneal is galvanizing followed by an annealing/diffusion step that makes the surface more suitable for painting. He also notes that a fuller answer would depend on the application context. In a later question, Neal Dugan asks about “Electrogalvanized Alloy” and “HGalvanneal.” Ted Mooney says “electrogalvanized alloy” is not a real specification and is just slang that does not mean anything different from electrogalvanized, except perhaps in a special context. He also says “HGalvanneal” appears to be a typo and that he is confident there is no such thing.
Q. PLEASE TELL ME WHAT THE DIFFERENCE IS?
DeAnn McMeekin
Coordinated Designs & Controls – Houston, Texas
2006
A. Hi DeAnn. Electrogalvanized means zinc electroplated. Galvanneal means galvanizing followed by an annealing/diffusion process which renders the surface more suitable to painting. If you explain the context behind your question, a more complete and satisfying answer can probably be offered.
Ted Mooney, P.E.
Striving to live Aloha
finishing.com – Pine Beach, New Jersey
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2006
Q. Hello,
Which one of the two types is more convenient for powder coating? Thank you.
Nasser Abdin
– Amman,Jordan
March 1, 2015
A. Hi Nasser. The annealing process supposedly diffuses iron from the base steel into the zinc of the galvanizing, reputedly leaving an alloy surface that is less problematic for the application of paint or powder coating. Pretreatment, generally with phosphatizing, is still required. My understanding is that the most corrosion-prone areas of automobiles like rocker panels and fenders are made of galvanneal material.
Regards,
Ted Mooney, P.E.
Striving to live Aloha
finishing.com – Pine Beach, New Jersey
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February 2015
Q. How does Electrogalvanized Alloy differ from Electrogalvanized or HGalvanneal
neal dugan
steel sales – bradfordwoods Pennsylvania
July 26, 2019
A. Hi. An alloy is simply a metal made of two or more different elements, ‘Electrogalvanized Alloy’ is not a specification, it’s just slang, so it would not actually mean anything different than ‘Electrogalvanized’, except possibly in some specific context. Why do you ask?
I think “HGalvanneal” was just a typo, but whether the typo was by you, or whether you are inquiring about a typo by someone else isn’t clear. I am pretty confident there is no such thing.
Regards,
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com – Pine Beach, New Jersey
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July 2019