STAINLESS STEEL - CORROSION
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The stainless steel has a characteristic high corrosion resistance and temperature.
Corrosion 
Develops across the material surface leading to loss of uniform thickness. To increase the corrosion resistance is a factor the increased levels of Cr (chromium), Ni (Nickel) and Mo (molybdenum), plus the addition of Cu (copper).
General Corrosion: 
Develops across the material surface leading to loss of uniform thickness. To increase the resistance to this type of corrosion is indicated increasing concentrations of Cr (chromium), Ni (Nickel) and Mo (Molybdenum), plus the addition of Cu (copper). 

• Crevice corrosion: 

This type of attack occurs located in recesses, cavities cracks and other spaces where they accumulate corrosive agents. To increase resistance to this type of corrosion is a factor increasing the Cr, Mo and N (Nitrogen). 

• Localized corrosion / pitting / Alveolar:
Type of localized attack in a specific area, where it shows a considerable drilling, while still around without suffering from the attacks. This type of corrosion is usually found on submerged parts in seawater. To increase the resistance to this type of corrosion is indicated the increase of Cr, Mo and N. 

Corrosion under stress fracturing (CSTF): 
Characterized by the combination of three factors: the residual stresses in the material, the medium where it's containing chlorides and temperatures above 60 ° C. The CSTF is evidenced by the appearance of radial cracks of rapid spread. To increase the resistance to this type of corrosion is a factor the increase in Ni content. 

• Intergranular corrosion / intercrystalline: 
Caused by the precipitation of chromium carbides on the surface of material, this form of corrosion can progress without being noticed. To increase resistance to this type of corrosion is indicated the use of alloys "L" which have ultra-low levels of C (below 0.035%), or the use of materials stabilized with Ti (titanium), Nb (Niobium) or Ta (Tantalum). 

Galvanic Corrosion: 
Occurs when two metals with different electrical potentials comes into contact. The contacts of different metals should be avoided. 

• Corrosion Erosion:

Occurs when the metal is subjected to a corrosive medium or a process mechanical wear. Within this framework, the passive film is continuously under corrosive and abrasive effects. Materials such as steels Duplex stainless steels are resistant to such corrosion. 

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