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Methods of prevention and protection of the corrosion


Corrosion is a natural phenomenon that occurs in metals, except gold and platinum, other known metals undergo a corrosive effect when placed in contact with atmospheres containing oxygen or hydrogen, which is why we need to know live with corrosion, for this we must know the methods and techniques that provide and delay the presence of this natural phenomenon.

Mainly we can protect metals from corrosion by taking action in the phases of design, modifying the environment or medium in which the piece or structure will be exposed, applying coatings to protect the piece or by anodic or cathodic protection.

Design

During the design phase, the designer must keep in mind the parameters that can cause corrosion on the piece or structure that is being designed, will not help all the time spent on calculations of resistance if the selected material corrodes rapidly in the environment in which will be exposed.

Following there are some parameters or guides that the designer has to consider:

Environment modification

The modification of the environment consist to reduce or eliminate the corrosive agents which is under the part or structure to be protected.

Basically it is used corrosion inhibitors, sequestrants and pH modifiers as techniques or methods to modify the environment.

For the use of these techniques is essential to know exactly the type of corrosive agent which will always be under the piece or the structure.

Protection by coatings

In this type of technique which is intended to isolate the piece or structure of the corrosive environment by applying an organic or metallic coating that makes the barrier function between the environment and the metal.

There are basically 2 types of coatings that can apply as techniques of corrosion protection:

Anodic and cathodic protecction

These types of protection are based onelectrochemical corrosion phenomenon to control the speed and progress of corrosion.

In cathodic protection make the piece or structure to be protected act as cathode; so that there not occurs corrosion, for this we can use some of these techniques:

In anodic protection make the piece or structure to be protected act as anode, causing it to corrode slowly and go to a state of passivity, this technique is restricted only to materials that possess an active-passive behavior.

Of all the methods mentioned above, the paint is the most commonly used to protect pieces or structures against corrosion, mainly due to low cost that requires and the extra functionality of aesthetic and design that brings the paints.

control of corrosion


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