Question

what is galvanisation?

Answer 1

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Galvanising is a method of rust prevention. The iron or steel object is coated in a thin layer of zinc. This stops oxygen and water reaching the metal underneath - but the zinc also acts as a sacrificial metal. Zinc is more reactive than iron, so it oxidises in preference to the iron object. Galvanization is a process in which coat of zinc is applied to the thicker base metal surface which are prone to corrosion such as iron. The process involves hot dip galvanization or electrogalvani zation

Hot dip galvanization process needs dipping of the metal which is to be made corrosion free,in a premolted zinc. To this solution chromate may also be added. This method does not ensure uniform coating

Electogalvanization involves transfer of zinc ions to the metal surface through electrons current. It ensures uniform coating.

Zinc protects the metal by forming a barrier between the metal and electrolyte such as salty water or environmental conditions.

Zinc also acts as a sacrificial anode. This anode undergoes chemical reaction faster in presence of cathode metal such as iron than it would when present alone. while on the others hand, iron which acts as a cathode would undergo slower corrosion in presence of zinc


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Answer 2

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GALVINISATION

it is the process of coating a layer of zinc on iron is called galvinisation. It is a process to prevent it from rusting.zinc is more reactive than iron. Thus iron is galvanized with zinc. This is done to protect the metal from being corroded. The principle behind it is that a more reactive metal is corroded which is on the surface thereby protecting the metal beneath it from corrosion.



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