22-02-2013, 02:33 PM
DETERMINATION OF CORROSION OF ALUMINUM
Theory :
Corrosion is the deterioration of a material because of its reaction
with the environment.
This disintegration process can be due to chemical oxidation,
atmospheric effects, galvanic couple reaction etc.Corrosion is a
natural process that seeks to reduce the binding energy in
metals. Aluminum reacts with oxygen and the first level stable
oxide film is formed which further protects the metal from
corrosion.
Al Al2O3 Al(OH)3
The corrosion of aluminum due to acidic or alkaline medium
takes place as follows:
Aluminum metal readily dissolves in alkaline medium with
formation of sodium aluminate and hydrogen.
Procedure :
(I) Determination of Corrosion of aluminium in acidic
medium
1. Take aluminum strip and weigh accurately on
electronic balance say X gm or mg.
2. Take 1N HCl in 100 ml beaker.
3. Dip it completely in 1N HCl and wait for four minutes.
Result : Aluminium corrodes in __________________________ medium.
Theory :
Corrosion is the deterioration of a material because of its reaction
with the environment.
This disintegration process can be due to chemical oxidation,
atmospheric effects, galvanic couple reaction etc.Corrosion is a
natural process that seeks to reduce the binding energy in
metals. Aluminum reacts with oxygen and the first level stable
oxide film is formed which further protects the metal from
corrosion.
Al Al2O3 Al(OH)3
The corrosion of aluminum due to acidic or alkaline medium
takes place as follows:
Aluminum metal readily dissolves in alkaline medium with
formation of sodium aluminate and hydrogen.
Procedure :
(I) Determination of Corrosion of aluminium in acidic
medium
1. Take aluminum strip and weigh accurately on
electronic balance say X gm or mg.
2. Take 1N HCl in 100 ml beaker.
3. Dip it completely in 1N HCl and wait for four minutes.
Result : Aluminium corrodes in __________________________ medium.