Types of Corrosion
Uniform, pitting, galvanic, crevice, concentration cell and graphitic corrosion
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Corrosion can be categorized in some common types
- uniform corrosion
- pitting corrosion
- galvanic corrosion
- crevice corrosion
- concentration cell corrosion
- graphitic corrosion
Uniform or General Corrosion
The metal loss is uniform from the surface.
Often combined with high-velocity fluid erosion, with or without abrasives.
Pitting Corrosion
The metal loss is randomly located on the metal surface.
Often combined with stagnant fluid or in areas with low fluid velocity.
Galvanic Corrosion
Occurs when two metals with different electrode potential is connected in a corrosive electrolytic environment.
The anodic metal develops deep pits and groves in the surface.
Crevice Corrosion
Occurs at places with gaskets, bolts and lap joints where crevice exists.
Crevice corrosion creates pits similar to pitting corrosion.
Concentration Cell Corrosion
Occurs where the surface is exposed to an electrolytic environment where the concentration of the corrosive fluid or the dissolved oxygen varies.
Often combined with stagnant fluid or in areas with low fluid velocity.
Graphitic Corrosion
Cast iron loosing iron in salt water or acids.
Leaves the graphite in place, resulting in a soft weak metal.
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Related Topics
- Corrosion - Corrosion in piping systems - caused by thermodynamic and electrochemical processes - corrosion problems and methods of protection and prevention
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Related Documents
- Copper Pipe - Water Velocity Limits - The water velocities in copper pipes should not exceed certain limits to avoid erosion
- Electrode Potential and Galvanic Corrosion - An introduction to the electrochemical series and corrosion of metals
- Metals and Corrosion Resistance - Common metals and their corrosion resistance to aggressive fluids as acids, bases and more
- Oxygen and Steel Pipe Corrosion - Oxygen concentration, temperature and corrosion of steel pipes
- Piping Materials & Galvanic Corrosion - Connecting pipes of common piping materials may cause galvanic corrosion and serious damage





