DEFINITION OF CORROSION
Corrosion is one of
the problems that will be encountered when utilizing the metal element.
Corrosion has an effect that is significant enough to make the metal becomes
useless. Corrosion is one of the reaction when the metal is in contact with
oxygen. When corrosion occurs, the metals react with oxygen and form compounds
called oxides on the surface of the metal. The metal becomes dull in the sense
of this metal lost luster properties. Metals and usefulness that have a high
degree of creativity will be faster than the corroded metals that are less
reactive. To prevent corrosion there are still some things to do. Examples of
iron (which is used to make steel alloy) is easily corroded, but strong and
fairly easily formed into various shapes. Iron suitable for building structures
which are very large, but it must be protected from corrosion, how to protect
it is to be painted. Why is that?
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| Corrosion |
Corrosion
Iron is used as a
bridge protected from corrosion by means painted with phosphoric acid. The acid
will form a bond with iron metal elements and forms a protective layer to
prevent corrosion on the metal underneath. Then the bridge will be further
protected by a layer of paint.
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| the bridge corrosion |
So we better know
what the effects of corrosion on the metal element is let's consider the
following explanation.
A. Effect of
Corrosion
When a metal is
corroded, its surface becomes covered with a layer of oxide. In some metals,
such as aluminum, is attached to the metal layer and protect it from further
corrosion. On the other metals protective layer is not formed. In the iron and
steel, for example, a layer of crusty rust (iron oxide) is formed. This layer
is separated, allowing corroded the metal beneath. For example:
Aluminum rapidly
form an oxide layer on its surface. Aluminum is an ideal material for making
food trays, because he will not be corroded further.
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| The steel drums |
The steel drums are
painted to protect against corrosion, but even small scratches can allow the
entry of moisture down car, and corrosion began to occur.
B. How to Prevent
Corrosion
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| painting the way |
In addition to
painting the way, there are also other ways to prevent rusting, for example, is
galvanizing. This is a method of protecting steel by means of coating with
zinc. Zinc is more reactive than steel, so that the oxygen in contact with her,
not with steel. Although the zinc coating is scratched, the oxygen in the air
continues to react with zinc, not with steel. Zinc and magnesium are often used
to protect iron or steel from corrosion, so it is often called the victim
metals.
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