General Knowledge - Basic General Knowledge - Discussion

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.

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.

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.

Galvansing is a process of coating iron or steel by zinc to avoid corrosion. But galvanised articles are not used for storing food as zinc may reacts and form zinc compounds dangerous to human health.

Zinc metal is used for galvanising iron because it is more reactive than iron. It reacts with air to form a hard layer of zinc oxide, which prevents air and moisture to come in contact with iron.

Galvanizing is a process of provinding a layer of zinc to steel to prevent corrosion and increase the life of steel. Galvanizing process also provides the good appearance to steel.

The process of coating metal or steel by zinc to avoid corrosion is galvansing. And for food materials it is done with the aluminium metal it prevents the oxidation process.

A coating of zinc is given to metals to prevent it from getting rusted. And this process of coating zinc on to other metals is called galvanisation.

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

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