Corrosion of metals

by | Aug 28, 2020 | Metals

Air is a mixture of various types of gases and water vapours. The gases and water present in air react gradually with the surfaces of metals and form their oxides, sulphides, carbonates or sulphates. The formation of these compounds eats up metals slowly. This...

Alloys

by | Aug 28, 2020 | Metals

An alloy is a homogeneous mixture of one metal with one or more other metals or non-metals. An alloy is prepared by mixing metals in the molten state in a fixed proportion by weight. Various properties of metals like malleability, ductility, strength, hardness,...

Iron metal

by | Aug 28, 2020 | Metals

Pure Iron is a grey-white metal. It appears to be brown due to rusting. Iron is magnetic, malleable and ductile. It is a good conductor of heat and electricity. Occurrence of Iron Iron is the second most abundant metal in earth’s crust. It is not found in a free state...

Aluminium

by | Aug 28, 2020 | Metals

Aluminium is the most abundant metal in the earth’s crust. It is a reactive metal so it occurs in combined state as its oxides and fluorides. The important ores of aluminium are: 1. Bauxite Al2O3.2H2O (aluminium oxide dihydrate) 2. Cryolite Na3AlF6 (sodium aluminium...

Methods of obtaining metals of very high purity

by | Aug 28, 2020 | Metals

There are two common methods which are used to get metals of very high purity. These are: 1. Zone Refining By this method, those metals are purified which require high purity such as germanium, silicon and gallium. In this method, impure metal is taken in the form of...