The hot dip galvanizing process produces a durable zinc iron alloy coating on steel protecting it from corrosion. Steel Products that are normally hot dip galvanized are highway guardrail, crash barriers, transmission towers, street lighting poles, pressed steel water tanks, steel structures for chemical and power plants, parapet handrails, steel reinforcements for walls, steel fencing, gates, grills, and many other applications .
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The chemically cleaned steel is then immersed into (6) a very hot pot of molten zinc heated to a temperature of about 860 degree F (460 degree C). When the cleaned and fluxed steel are dipped into molten zinc it reacts with molten zinc resulting in the formation of a series of metallurgically formed zinc-iron alloy layers. (Refer to Diagram 2) These zinc-iron alloy layers namely (A) Eta Layer is pure zinc but relatively soft layer (100% Zn and 79 DPN ). The (B) Zeta Layer contains about 6% iron (94% Zn 6% Fe at 179 DPN). Next is the (C) Delta Layer with about 10% iron (90% Zn 10% Fe and 244 DPN) and (D) the Gamma Layer with between 21% to 28% Iron ( 75% Zn 25% Fe at 350 DPN). These two layers are very hard Zn-Fe alloy layers that are even harder than (E) the Base Steel at 155 DPN. These alloy layers provides the durable and abrasion resistant high performance zinc coating that continuously protects steel against corrosion.
ReplyDeletegalvanizing for corrosion protection
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