Corrosion and its Prevention
Corrosion and its Prevention
Corrosion:
It is the slow process of eating away of metals by the reaction of atmospheric air and moisture, e.g. rusting of iron, tarnishing of silver, formation of green coating over copper etc.
When a copper vessel is exposed to moist air for long, it acquires a dull green coating. The green material is a mixture of copper hydroxide and copper carbonate
. The reaction involved is
• Iron reacts with oxygen and moisture present in the atmosphere to form a brown, flaky substance called rust. Rusting of iron in an undesirable reaction because the layer of rust formed falls off, exposing the metal to further rusting.
Prevention of Corrosion:
Rusting of iron is prevented by galvanizing, by making alloys, painting greasing or oiling and tin- planting and chromium plating which are explained below:·
1. Galvanisation: The process of coating iron and steel objects with a thin layer of zinc is called galvanization. It is done by dipping the object in molten zinc.The galvanized article is protected against rusting even if the zinc coating is broken.·
Which of the following is/are necessary for rusting to take place ? | |||
| Right Option : B | |||
| View Explanation | |||
The metal which is not corroded by air, water and acids is __________________ | |||
| Right Option : D | |||
| View Explanation | |||
Two Statement are made Statement A : Zinc is used in the galvanization of iron Statement B : Its coating on Iron articles increasing the life of it by protecting it from rusting | |||
| Right Option : C | |||
| View Explanation | |||
Students / Parents Reviews [20]
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Om Umang
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10thAbhyas institute is one of the best coaching institute in the vicinity of Ambala Cantt area. The teachers of the institute are well experienced and very helpful in solving the problems of the students.The good thing of the institute is that it is providing extra classes for the students who are w...
Aman Kumar Shrivastava
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8thIn terms of methodology I want to say that institute provides expert guidence and results oriented monitering supplements by requsite study material along with regular tests which help the students to improve their education skills.The techniques of providing education helps the students to asses...
