04-08-2012, 12:29 PM
Non-Metallic Coatings
[attachment=30194]
Defination of metal
In chemistry, metal is defined as an element with a valence of 1,2 or 3.
It can also defined as solids composed of atoms held together by a matrix of electrons
Types of Metal coatings
Electroplating
Hot dip galvanising
Aluminium coating of steel
Thermal spray coating
Chemical vapour deposition
Vacuum evaporation & thin film deposition
Phospate coatings
Phosphate coatings are of porous crystalline structure and firmly bounded to the base metal.
They are produced by a complete chemical reaction taking place between free phosphoric acid, metallic phosphate salts and the metal being processed.
There are three commonly know coating are
Iron phosphate
Zinc or zinc iron phosphate and
Manganese phosphate
Application of phosphate coating
The maximum use of phosphate coating is made to prepare the surface before painting over & above it is used for following application :
As a base for oil and other corrosion resistant.
For lubricity and wear resistance.
To prepare surface for satisfactory cold forming.
Temporary or short time protection against corrosion.
As a base for adhesives used for plastic-metal lamination and rubber-metal lamination.
[attachment=30194]
Defination of metal
In chemistry, metal is defined as an element with a valence of 1,2 or 3.
It can also defined as solids composed of atoms held together by a matrix of electrons
Types of Metal coatings
Electroplating
Hot dip galvanising
Aluminium coating of steel
Thermal spray coating
Chemical vapour deposition
Vacuum evaporation & thin film deposition
Phospate coatings
Phosphate coatings are of porous crystalline structure and firmly bounded to the base metal.
They are produced by a complete chemical reaction taking place between free phosphoric acid, metallic phosphate salts and the metal being processed.
There are three commonly know coating are
Iron phosphate
Zinc or zinc iron phosphate and
Manganese phosphate
Application of phosphate coating
The maximum use of phosphate coating is made to prepare the surface before painting over & above it is used for following application :
As a base for oil and other corrosion resistant.
For lubricity and wear resistance.
To prepare surface for satisfactory cold forming.
Temporary or short time protection against corrosion.
As a base for adhesives used for plastic-metal lamination and rubber-metal lamination.