15 Questions
What are the most prominent causes responsible for the decay of metals?
Corrosion, abrasion, and erosion
What is the decay of a metal due to the action of surrounding medium called?
Corrosion
In what form do industrially important metals primarily occur in nature?
Oxides
What term is used to describe the reduction of metals from their ores at smelting works?
Smelting
What type of reaction is responsible for the decay of a metal when it comes in contact with gaseous or liquid medium?
Chemical or electrochemical reaction
What is the term used to describe the reduction of metals from their oxides at smelting works?
Reduction
In what form do industrially important metals primarily occur in nature?
Oxides and carbonates
What is the primary cause responsible for the decay of a metal when it comes in contact with gaseous or liquid medium?
Corrosion
What is the term used to describe any process of chemical or electrochemical decay or destruction of a metal due to the action of surrounding medium?
Corrosion
7.11
Protection of metals from corrosion
What are the two main types of atmospheric corrosion?
Corrosion due to oxygen and corrosion due to other gases
What is responsible for the faster rate of corrosion in humid and polluted atmospheres near industrial areas?
Corrosive gases like Cl2, H2S, SO₂
What happens to metallic surfaces when exposed to air?
Undergo oxidation
What compounds do metallic surfaces get coated with in the presence of corrosive gases?
Oxides, sulphides, basic carbonates
What is the type of corrosion brought about by atmospheric conditions called?
Atmospheric corrosion or direct chemical corrosion
Test your knowledge about the basics of corrosion, including the magnitude of the problem, types of corrosion, atmospheric corrosion, immersed corrosion, electrode potential, mechanisms, and protection methods.
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