28-01-2013, 01:05 PM
To study of the effect of metal coupling on the rate of corrosions
[attachment=48600]
Theory:
• Corrosion is a serious problem of some
metals like iron, zinc, aluminium and alloys
like brass which are commonly used in day
to day life.
• Apart from reducing the life of articles
made up of these metals or alloys the
chemical substances formed out of
corrosion have serious public health
problems.
• Replacement of machines or their parts
and many other articles in industrial and
public dealing lead to huge expenditure.
• Hence, how to reduce or avoid corrosion
of articles made up of metals or alloys has
been a major subject of study in the field
of chemistry and electro-chemistry.
Procedure:
(i) Mix 9 ml. of conc. HCl with 241 ml. of
water to form 250 ml. of solution.
(ii) Take this solution in seven different
beakers.
(iii) Mark each beaker serially from 1 to 7.
(iv) Take the weights of three iron sheets,
three aluminium rods, three brass rods and
three zinc sheets.
(v) Now keep iron sheets, aluminium rods,
zinc sheets and brass rod in separate
beakers.
(vi) Then take iron + brass, iron +
aluminium, iron + zinc, aluminium + zinc
and
brass + zinc and keep them in different
beakers.
(vii) Allow the reactions to occur for 24
hours.
(viii) Note the maximum and minimum
temperatures.
(ix) Now at the end of reaction take out the
metals and keep them in sun for
sometime so that they get dried up quickly
(x) Take the weights of each specimen and
note the difference.
(xi) Similarly repeat 1,2,3,4,5,6,7 and 8
steps in a basic solution.
Conclusions:
• Corrosion is a serious problem of some
metals like iron, zinc, aluminium and alloys
like brass which are commonly used in day
to day life.
• Apart from reducing the life of articles
made up of these metals or alloys the
chemical substances formed out of
corrosion have serious public health
problems.
• Replacement of machines or their parts
and many other articles in industrial and
public dealing lead to huge expenditure.
[attachment=48600]
Theory:
• Corrosion is a serious problem of some
metals like iron, zinc, aluminium and alloys
like brass which are commonly used in day
to day life.
• Apart from reducing the life of articles
made up of these metals or alloys the
chemical substances formed out of
corrosion have serious public health
problems.
• Replacement of machines or their parts
and many other articles in industrial and
public dealing lead to huge expenditure.
• Hence, how to reduce or avoid corrosion
of articles made up of metals or alloys has
been a major subject of study in the field
of chemistry and electro-chemistry.
Procedure:
(i) Mix 9 ml. of conc. HCl with 241 ml. of
water to form 250 ml. of solution.
(ii) Take this solution in seven different
beakers.
(iii) Mark each beaker serially from 1 to 7.
(iv) Take the weights of three iron sheets,
three aluminium rods, three brass rods and
three zinc sheets.
(v) Now keep iron sheets, aluminium rods,
zinc sheets and brass rod in separate
beakers.
(vi) Then take iron + brass, iron +
aluminium, iron + zinc, aluminium + zinc
and
brass + zinc and keep them in different
beakers.
(vii) Allow the reactions to occur for 24
hours.
(viii) Note the maximum and minimum
temperatures.
(ix) Now at the end of reaction take out the
metals and keep them in sun for
sometime so that they get dried up quickly
(x) Take the weights of each specimen and
note the difference.
(xi) Similarly repeat 1,2,3,4,5,6,7 and 8
steps in a basic solution.
Conclusions:
• Corrosion is a serious problem of some
metals like iron, zinc, aluminium and alloys
like brass which are commonly used in day
to day life.
• Apart from reducing the life of articles
made up of these metals or alloys the
chemical substances formed out of
corrosion have serious public health
problems.
• Replacement of machines or their parts
and many other articles in industrial and
public dealing lead to huge expenditure.