How to protect Metal from Corrosion - Corrosion Protection
There are four basic methods to Protect Metal from Corrosion:
In most cases, effective protection from corrosion is obtained by combining two or more of these methods.
Corrosion control and protection from corrosion should be considered at the design stage of a given facility or system.
The methods selected for protection from corrosion must be appropriate for the
materials used, for the configurations, and for the types and forms of corrosion
which must be controlled.
There are no materials that are immune to corrosion in all environments.
Materials must be matched to the environment that they will encounter in
service. see corrosion resistance table
Protective coatings are the most widely used
corrosion control technique for protection from corrosion. Essentially, protective coatings protect metal from
corrosion by separating the surfaces that are susceptible to corrosion from the
factors in the environment which cause corrosion to occur.
Cathodic protection protect metal from corrosion by interfering
with the natural action of the electrochemical cells that are responsible for
corrosion. Cathodic protection can be effectively applied to
control corrosion of surfaces that are immersed in water or exposed to soil.
Corrosion Inhibitor protect
metal from corrosion by one or more of these mechanisms:
1. By adsorption as a thin film on the surface of a
corroding material
2. By inducing formation of a thick corrosion product
3. By forming a passive film on the metal surface
4. By changing characteristics of the environment either by producing
protective precipitates or by removing or inactivating an aggressive constituent
see also:
|
|