Newbie question on controlling thickness of galvanized coating
Newbie question on controlling thickness of galvanized coating
(OP)
This is my first post here . I attempted to hot dip galvanize a small steel strip ( 150mm x 50mm x6mm thick) to achieve a coating thickness of 50 microns max. I ended up getting a real thick coat.
This galvanized steel strip is to be placed in zinc anode casting , which the foundry produces .
Currently, process of galvanizing is outsourced and I do not have access to their process.
My question, what is the right process , I hear of Cold Galvanizing, Zinc paint spray etc to achieve this thickness and acceptable to oil and gas industry.. Can someone guide me please.
If HDG is the right process, what am I doing wrong to get such a thick deposit.
Thanks in anticipation and also tolerating an amateur question. ( This is not a hobby or student question.)
This galvanized steel strip is to be placed in zinc anode casting , which the foundry produces .
Currently, process of galvanizing is outsourced and I do not have access to their process.
My question, what is the right process , I hear of Cold Galvanizing, Zinc paint spray etc to achieve this thickness and acceptable to oil and gas industry.. Can someone guide me please.
If HDG is the right process, what am I doing wrong to get such a thick deposit.
Thanks in anticipation and also tolerating an amateur question. ( This is not a hobby or student question.)
I'm just one step away from being rich, all I need now is money.
( read somewhere on the internet)





RE: Newbie question on controlling thickness of galvanized coating
If you need a coating of a specific thickness, hot dipping is not the way to go, but it does give the best corrosion protection. Depends on what you need.
RE: Newbie question on controlling thickness of galvanized coating
RE: Newbie question on controlling thickness of galvanized coating
RE: Newbie question on controlling thickness of galvanized coating
I did experiment with raising the temperature or the dip time . Also, as the thickness is 6 mm, it has higher chilling capacity.
The question still remains,if HDG is the right method ( to obtain 50 microns deposit)?
What is Cold Galvanizing and how is it done?
I'm just one step away from being rich, all I need now is money.
( read somewhere on the internet)
RE: Newbie question on controlling thickness of galvanized coating
http://www.gaa.com.au/index.php?page=coating-thick...
"Cold galvanizing" is essentially an applied coating (or paint), consisting mostly of zinc powder or flakes. Both organic and inorganic zinc primers are sometimes referred to a "cold galvanizing". Some manufacturers will claim the same performance as hot dipped galvanizing, but that is usually just sales talk.
RE: Newbie question on controlling thickness of galvanized coating
RE: Newbie question on controlling thickness of galvanized coating
I still think your better option for a consistent and thin coating is to use electroplating of the steel with zinc (electro galvanizing).
RE: Newbie question on controlling thickness of galvanized coating
I'm just one step away from being rich, all I need now is money.
( read somewhere on the internet)
RE: Newbie question on controlling thickness of galvanized coating
RE: Newbie question on controlling thickness of galvanized coating
like
G90 (approx. .8 mils on each side)
G185 (approx. 3 mils on each side)
Typically HDG (ASTM A123) minimum is in excess of 50um.. Like 85 min or so.
RE: Newbie question on controlling thickness of galvanized coating
I was getting thickness in the range 90-95 .
corypad,
I do not have readily the number, though, I have been told that it is around 50-55 .
Sorry, as I am unable to provide any input beyond this.
I'm just one step away from being rich, all I need now is money.
( read somewhere on the internet)
RE: Newbie question on controlling thickness of galvanized coating
There is one method for reducing HDG thickness, used extensively by the coil coating industry for continuous galvanizing (sheet steel) - the sheet steel passes through air blades immediately after coming out of the bath, and the blades "wipe" off excess zinc while it is still liquid. Random example from Googling:
http://www.tradekorea.com/product/detail/P274853/C...
Alternately, can you just buy some 6mm thick galvanized sheet and shear it to your desired width? Or do you really need the edges galvanized as well? Galvanized sheet is a commodity, so I'm wondering if you really really need to re-invent the wheel. Call out ASTM A653 with your required coating thickness range.
RE: Newbie question on controlling thickness of galvanized coating
Do you know a supplier that routinely runs at 50-micrometer thickness? I have never seen anything that high. ASTM B633 tops out at 25 micrometers, and that isn't very common. I wonder what the time, and current, and hydrogen would be in a process used to produce 50 micrometers of zinc.
Thanks.
RE: Newbie question on controlling thickness of galvanized coating
Hm, Metallizing could be another option for the original poster.
RE: Newbie question on controlling thickness of galvanized coating
G90/G185 are just 2 examples. There are many other thicknesses available.
RE: Newbie question on controlling thickness of galvanized coating
There is no debate about obtaining coatings of this thickness using hot dip galvanizing, which is identified in ASTM A653. There is some question on who/where/what can provide coatings of this thickness via electroplating, which is outside ASTM A653.
RE: Newbie question on controlling thickness of galvanized coating
Its just not cost effective at all.. Unlike at home "Bath Time" cost decent money. :)
RE: Newbie question on controlling thickness of galvanized coating
I'm just one step away from being rich, all I need now is money.
( read somewhere on the internet)
RE: Newbie question on controlling thickness of galvanized coating