Corrosion

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Presentation Transcript

Slide 3: 

EXAMPLES OF CORROSION

Chemical Equation of Corrosion : 

Chemical Equation of Corrosion Fe2O3.xH20

TYPES OF CORROSION : 

TYPES OF CORROSION

Uniform Corrosion : 

Uniform Corrosion

Galvanic Corrosion : 

Galvanic Corrosion

Pitting Corrosion : 

Pitting Corrosion Electrolyte (H2O plus dissolved oxygen)

Stress Corrosion : 

Stress Corrosion

Erosion Corrosion : 

Erosion Corrosion

Microbial Corrosion : 

Microbial Corrosion

Preventions of Corrosion : 

Preventions of Corrosion

Active Corrosion Protection : 

Active Corrosion Protection The aim of active corrosion protection is to influence the reactions which proceed during corrosion, it being possible to control not only the package contents and the corrosive agent but also the reaction itself in such a manner that corrosion is avoided. Examples of such an approach are the development of corrosion-resistant alloys and the addition of inhibitors to the aggressive medium.

Passive Corrosion Protection : 

Passive Corrosion Protection In passive corrosion protection, damage is prevented by mechanically isolating the package contents from the aggressive corrosive agents, for example by using protective layers, films or other coatings. However, this type of corrosion protection changes neither the general ability of the package contents to corrode, nor the aggressiveness of the corrosive agent and this is why this approach is known as passive corrosion protection. If the protective layer, film etc. is destroyed at any point, corrosion may occur within a very short time.

Permanent Corrosion Protection : 

Permanent Corrosion Protection The purpose of permanent corrosion protection methods is mainly to provide protection at the place of use. The stresses presented by climatic, biotic and chemical factors are relatively slight in this situation. Machines are located, for example, in factory sheds and are thus protected from extreme variations in temperature, which are frequently the cause of condensation.

Temporary Corrosion Protection : 

Temporary Corrosion Protection The stresses occurring during transport, handling and storage are much greater than those occurring at the place of use. Such stresses may be manifested, for example, as extreme variations in temperature, which result in a risk of condensation. Especially in maritime transport, the elevated salt content of the water and air in so-called sea salt aerosols may cause damage, as salts have a strongly corrosion-promoting action.

Slide 17: 

Created & Edited by- Hitesh Goel