Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Zinc epoxy or cold galvanizing in lieu of hot dip galvanizing
Q. Where can I find cold galvanizing compound Cold Galvanizing Compound / Zinc Rich Paint? Our boiler system (which used some galvanized pipe) has a couple of connections where hydrolysis has occurred. It was recommended that we clean the area and then paint it with the galvanized paint. I can not seem to find it anywhere.
Pamela Johnson- Houston, Texas, USA
2001
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A. Connect to zrcworldwide.com they have cold galvanizing compounds. Oscar Infante- Santiago, Chile A. Brite Products and ZRC both have good products. You can get a list of suppliers for touch up and repair of galvanized steel at www.galvanizeit.com. There should be a link for literature and you can download it in adobe. M Stroia- Canton, Ohio |
COLD ZINC COATING STEEL WIRE
Q. IS THERE ANY ALTERNATE PROCESS IN COLD DIP OTHER THAN HOT DIP GALVANIZING TO MFG. DETONATOR WIRE AT SPEED OF 80 TO 100 M/MIN WITH ZINC COATING OF MIN. 25 MICRON.
ALOK KHANDELWAL- NAGPUR, MAHARASTRA, INDIA
2003
A. Sure, Alok. The wire could be electroplated with zinc, which would be fast and would allow you to control the thickness. Although 25 microns is pretty thick for electroplating, it's not out of range, but and dip galvanizing that thin might be difficult anyway. Good luck.
Regards,
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Q. My problem in shipping...instead of using galvanizing in chain locker part (perforated plate) in ship, can I use paint with zinc rich epoxy primer followed by coal tar epoxy?
VelmuruganIndian register of shipping - Mumbai, Maharastra, India
2005
A. Hi, Velmurugan. Although there is nothing really "wrong" with cold galvanizing, it doesn't offer the life and robustness of real hot dip galvanizing.
Regards,
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Q. One of friends suggested to start a plant for galvanizing in a GCC country. Basically I don't know What is the difference Hot dip/Cold galvanizing. I would appreciate If you could explain more about this industry.
Thanks
I am Eager to know the difference between hot dip galvanising & Cold galvanising
Mohamed Faizal2005
- Kinfra, Technopark, Kakkancheri, South India
A. Many people refer to Mechanical Galv to ±60 µm of zinc as cold galv. This is a process whereby zinc dust
⇦ this on
eBay or
Amazon [affil links]
is applied with kinetic energy due to a rotating rubber lined barrel.
The process is cold but can deposit high thickneses of zinc or zinc alloys.
Gary Joseph
Johannesburg,
South Africa
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Q. Sir, vocational trainee - Jamshedpur, Jharkhand, India 2005 A. Hi Deepak, I assume that you are implying that the galvanized coating thickness is about 25% thicker when the strip goes through the furnace compared to when it doesn't? Have you measured it and shown that? To my limited understanding, strip processing lines usually have some type of wipers or air blow-off device to limit the thickness of the deposit. Can you tell us anything about that? This particular thread is more about zinc-rich paints than hot dip galvanizing, but we have many threads specifically about galvanizing thickness control and causes for variations if you search the site. Luck & Regards, Ted Mooney, P.E. Striving to live Aloha finishing.com - Pine Beach, New Jersey |
How to know between hot galvanized steel vs. cold method
Q. Dear Sir,
I bought galvanized steel from a dealer and sometimes they gave me steel galvanized by cold method instead of the hot method. Is there a quick and simple method to tell whether the steel was galvanized by hot or cold method?
Thank you
science - Egypt
2006
A. Hot galvanizing is pure metal applied from a molten bath and it will look like pure metal, often it will exhibit a pronounced large mottled appearance (often seen on garbage cans) or a dull gray and drippy appearance (often seen on roofing nails). Cold galvanizing compound Cold Galvanizing Compound / Zinc Rich Paint is a zinc-rich paint of some sort and will usually look like paint. You will probably find it easier to chip or scratch the cold galvanizing than hot-dip galvanizing.
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Cold Galvanizing a water splash ride at a Amusement park
Q. Hi All,
One of our customers has aging galvanized structure , it is a water splash slide at an amusement park.
We are going to use cold galvanizing spray to coat it.There are many areas which have corrosion this includes some sheets, under track areas portions of the supporting metal pillars, almost all the fasteners.
we plan to use rust converter
⇦ this on
eBay
or
Amazon [affil links]
to reclaim the corroded areas and then coat it with zinc rich spray.
What surface preparation do you suggest ?
1) Sand blasting cannot be done because it is an amusement park , where hundreds of people come every day.
2) we are suggesting a scaffold structure so that men can reach various corners of the structure.
Does any one have prior experience?
- Rajasthan, India
February 18, 2012
A. Hi. I don't have amusement park experience, but I imagine that at least a few typical fasteners must be removed and examined, perhaps even strength tested, to understand whether corrosion has compromised them. There may be related guidelines in the bridge inspection industry if none exist in the amusement park industry. Obviously they must be replaced, not recoated, if severely compromised. Proper prep probably involves wire-brushing badly rusted areas, washing the structure similar to washing a car if that's practical, applying the rust converter ⇦ this on eBay or Amazon [affil links] , then (after drying/curing) applying the cold galvanizing spray.
Luck & Regards,
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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