What is Galvanized Steel?
|
|
Galvanized steel has gone through a chemical process to keep it from corroding. The steel gets coated in layers of zinc because rust won't attack this protective metal. For countless outdoor, marine, or industrial applications, galvanized steel is an essential fabrication component.
The principal method of making steel resist corrosion is by alloying it with another metal, zinc. When steel is submerged in melted zinc, the chemical reaction permanently bonds the zinc to the steel through galvanizing. Therefore, the zinc isn't exactly a sealer, like paint, because it doesn't just coat the steel; it actually permanently becomes a part of it.
The zinc goes through a reaction with the iron molecules within the steel to form galvanized steel. The most external layer is all zinc, but successive layers are a mixture of zinc and iron, with an interior of pure steel. These multiple layers are responsible for the amazing property of the metal to withstand corrosion-inducing circumstances, such as saltwater or moisture.
Zinc also protects the steel by acting as a "sacrificial layer." If, for some reason, rust does take hold on the surface of galvanized steel, the zinc will get corroded first. This allows the zinc that is spread over the breach or scratch to prevent rust from reaching the steel.
The degree of galvanizing is usually represented as the zinc's weight per surface area rather than the thickness of the zinc, because this gives a better representation of how much metal has been applied. Steel often gets galvanized after individual parts have been formed, such as braces, nails, screws, beams, or studs. However, raw galvanized steel in sheets will withstand some bending and forming without flaking.
Galvanized steel can be found almost everywhere. You might be living in a steel frame house. You are no doubt surrounded by steel parts in your car that allow it to emerge from rainstorms unscathed. Many people work in an office with metal roofing made of galvanized steel. Besides being inexpensive and effective, this metal is popular because it can be recycled and reused multiple times.
|
Related wiseGEEK articles
Category
Other Links
wiseGEEK features
Subscribe to wiseGEEK
|
56
We are pipe galvanizers. After galvanizing we directly dip the pipe in a solution of sodium dicromate+ 0.1 percent sulfuric acid. After the pipe is taken out from the passivation solution, there are yellow marks on the pipe. How do we remove the marks and are we doing passivation properly. - anon52797
55
I agree with you about the degree of galvanising. would you please let me know what is the difference among class A, Class B and Class C? I mean the weight range for the above three. - anon52332
54
Robert Galvin is the man who invented Galvinized metal. He discovered it when he dropped a spoon in a tub of liquid zinc (originally for the mayor for reasons unknown) and found that it didn't rust like the rest. He then made a note of them and nicknamed the spoon the "Galvinized spoon". - anon52235
53
What is the thermal conductivity of typical galvanized steel? A quick answer would be much appreciated, thank you. - anon50445
52
Do I need to make adjustments to my weld schedule if I am resistance spot welding Electrogalvanized vs Hot Dipped galvanized sheet metal? - anon47516
51
who invented this method? - anon46359
50
Most galvanized steel is coated with a passivation chemical to prevent "white rust". A common passivation chemical used is Hexavalent Chromium; a very harmful carcinogen when ingested, absorbed by the skin, or inhaled. Welding and other heating of galvanized steel can allow the passivation chemical to be liberated and thereby create a health concern. -- Jerry Lavoie - anon44338
49
Can galvanized steel be forged safely? - anon43229
48
galvinised steel can be welded as i welded a butt arch joint at school the other day. - anon42685
47
If galvanized steel were used for a laptop lock, could a thief easily cut through it compared to a bike U-lock? - anon39815
46
can galvanised steel be painted? - anon37553
45
galvanized bolts and nuts can be used in electrical termination ? where we have to maintaine low joint resistance ie good bonding - anon36853
44
Nathan it depends on your steel thickness to the amount of zinc coating needed to that paticular part. minimum thickness and galvanized coatings are measured in mils - anon35910
43
You cannot weld galvanized steel. you must first strip it down to the bare metal and then regalvanize it.
Depending on the type of acids and degreaser your galvanizer is using will vary on the types of fumes released.
Steel is not magnetized during the galvanizing process.
Using galvanize grill screens are safe as long as you do not heat the screen over 730 degrees. Galvaning is measured in mils not G-000.And it depends on your steel thickness and chemistry of the steel to the amount of zinc that part would pick up. Galvaneal Coating (A) - Coatings on hot-dipped galvanized steels processed to convert the coating completely to zinc-iron alloys; dull gray in appearance, have no spangle, and after proper preparation, are well suited for painting.so this goes over the galvanized coating.
- anon35908
42
Does no one answer these questions? and if so, where?
If heated, will galvanized steel release harmful toxins? - anon35247
Editor's reply: Occasionally, an editor will answer questions in posts, but normally, we like to allow our readers to help each other by posting helpful answers.
41
Would galvanised steel, electroplated steel or steel painted with anti-rust paint be the best type of steel to use for ship building? - anon33543
40
I'm disappointed. I see lots of questions but few answers. I was particularly interested in knowing if galvanization on metal was a health hazard such as the question of whether a galvanized wire mesh could be used as a grill on the barbecue? - butel1208
39
just want to read responses to above postings - REMuns
38
As per code requirements, I am installing a heat shield on combustible walls and ceiling around my woodstove. They recommend sheet metal. I have several 4' X 8' sheets of good heavy galvanized sheet metal I would like to use. I expect temps. somewhere around 300 / 350 degrees max. or lower. Is there any fuming I should be concerned with? - anon22619
37
I have a galvanized chimney that goes from my gas furnace to my chimney and out in the attic.Sometimes rain comes down the chimney and shows a white powder on the galvanized in the attic area. I think this is corrosion. I was told it is not and would never corrode through. Is this true, or should I be concerned. Thank you, Charlie - charlie44
36
what's galvanized steel's SRI? (Reflectivity and emissivity)? - anon18416
35
Galvanized pipes are available in Above ground pipes up to what size? - anon17564
34
can galvanized steel be welded? - nkiruevan
33
I used a galvanized garbage can to season my Dutch Oven. I got the internal temp. up to 400 degrees F. Someone mentioned that I might have gotten fumes from the zinc in the oven. From my understanding, zinc will not turn to gas until it gets to over 900 degrees C. My question is: Is seasoning my Dutch oven this way safe? Also, is it safe to cook a turkey in a galvanized garbage can? - jdarden
32
anon16792 - Galvanize is just a coating. So the strength goes to the steel, not the _galvanized_ steel. There are different strengths: tensile, yield, compression, shear. Strength depends on whether the steel is hardened, annealed... When you talk about strength you have to specify all those elements, plus the material itself, if it is carbon steel, stainless steel, alloy steel....
anon16449 - yes, galvanized steel attracts magnets. - pixiedust
31
what is the shaer stress of galvanized steel - anon16792
30
Does galvanized steel attract magnets? - anon16449
29
is galvanized steel worth more than original steel? - anon13918
28
galvanization can affect the stainless steel when installed together? - anon13648
27
What is the difference between galvanized steel, perma-gold, electro-galvanized, pregalvanized and hot dip galvanized? If the difference is the thickness of the zinc galvanized finishes, what is the service life for each of these finishes? - jgonzales
25
what are performance factors, safety, purpose and durability of galvanized steel - alig
23
What is the chemical makeup of galvanized steel? - tom2514
22
If you dropped a burning charcoal red ember on Galvanized Steel, is there anything harmful in the make up of Galvanized Steel that could release toxic fumes? Would it be able to withstand the heat from a burning charcoal red ember? - tom2514
20
What is the difference between Galvanized steel and Galvaneal Steel? - anon11155
15
I have a gas log fireplace non vented. I want to place a thin galvanized plate above fire about 15". Will it get too hot? - anon5803
14
Can galvanized steel be welded? - alipishi
13
I saw on another website that the thickness is measured ranging from G-30 to G-235. How thick is that, and when is the thicker coating used? - Nathans
12
Can galvanized steel (Roofing) be soldered? thank you, tom rosdick - anon4954
11
Can a galvanized trash can be used to cook food by using the trash can as a type of outdoor oven. I've read an article about cooking turkeys in a trash can. The article said to burn the trash can before using it to cook. - gfain
10
How thick is the zinc layer of galvanized roof flashing? - anon3682
9
Is it safe to use a galvanized wire mesh as a grill in my barbecue grill?
- stanmasch
8
is it true that galvanized springs used in garage doors, are weaker than regular coated springs? - anon2978
7
does galvanized steel give off bad fumes if it gets too hot? - ronchis
6
is it safe to burn in a galvanized bucket, or does it make toxic fumes? does the zinc coating produce fumes, and if so are they safe. - anon2532
5
is galvanized steel magnetic? - anon2481
1
Can you use galvanized steel from an air conditioning duct to make a meat smoker? Will fumes from the zinc come off in the smoke and harm you. Is there anything else in the galvanization process besides zinc that could give off fumes? - cordellv
|
Written by
S. Mithra
Last Modified: 17 November 2009
copyright © 2003 - 2009
conjecture corporation
