General Knowledge - Basic General Knowledge - Discussion

There are two process by which the galvanizing process can be done, first type is to pass the iron metal from the molten zinc and the other process is via electroplating. Generally we follow the molten metal zinc process for the galvanizing.

But why only the galvanisation is carried out only via zinc coating not by any other metal. We cannot preserve food in a zinc coated pots because zinc can react with the food material which cause harmful to the human health.

It's a Processing to get Zinc-alloy.

The term is derived via French from the name of Italian scientist Luigi Galvani. Originally, galvanization was the administration of electric shocks, in the 19th century also termed Faradism.

This sense is the origin of the meaning of the metaphorical use of the verb galvanize, as in galvanize into action, or to stimulate a complacent person or group to take action. The term galvanization has largely come to be associated with zinc coatings, to the exclusion of other metals.

Galvanic paint, a precursor to hot-dip galvanization, was patented by Stanislas Sorel, of Paris, France in December, 1837. The earliest known example of galvanizing of iron is found on 17th century Indian armor in the Royal Armouries Museum collection.

Corrosion is a destruction of metals or alloys from the surrounding environment through chemical or electrochemical changes.

When iron material is placed in a environment that contain moisture then upper layer iron react with moisture and utensil got corrosion.

What is corrosion?

Galvanized iron is iron which has been coated in a layer of zinc to help the metal resist corrosion. Steel can also be galvanized. When metal is going to be used in an environment where corrosion is likely, it is often galvanized so that it will be able to withstand the conditions. Even with galvanization, however, corrosion will eventually start to occur, especially if conditions are acidic.

There are two primary techniques which can be used to make galvanized iron. The most common is hot-dip galvanization, in which the iron is moved through an extremely hot bath of molten zinc, which may be mixed with small amounts of lead, depending on the circumstances. When the iron emerges from the bath, the zinc will have bonded, creating a layer of zinc on the surface of the iron. Sometimes, the metal may be passed through a mill to flatten and even out the coating. Another technique which can be used is electrodeposition, also known as electroplating, although this is rare.

Once galvanized, iron is covered in a layer of zinc which may be shiny to dull gray. The zinc can be painted, if desired, or left plain. Painting is often done when the iron must match other building materials, or when people want to make it less obvious. In the garden, for example, it may be painted green so that it will blend in with foliage instead of standing out.

Zinc is more reactive and produces Zn+2 ions readily. It is placed higher in reactivity series therefore cannot be displaced by iron.

What is preventing zinc?

Is the process of applying a protective zinc coating to steel or iron, in order to prevent rusting.