• EC • Season Cracking • Caustic Embrittlement • Intergranular • SSC • LME • MIC • SCC • HB-HE-HIC • Fatigue • Erosion • Fretting • Index

Different Types of Corrosion
- Recognition, Mechanisms & Prevention

Erosion Corrosion

Recognition

What is Erosion Corrosion? Erosion Corrosion refers to the combined action involving erosion and corrosion in the presence of a moving corrosive fluid or a metal component moving through the fluid, leading to accelerated loss of metal.

What causes Erosion Corrosion?

The mechanical effect of flow or velocity of a fluid combined with the corrosive action of the fluid causes accelerated loss of metal. The initial stage involves the mechanical removal of a metal's protective film and then corrosion of bare metal by a flowing corrosive occurs. The process is cyclic until perforation of the component occurs.

Erosion-corrosion is usually found at high flow rates around tube blockages, tube inlet ends, or in pump impellers. The photo shows erosion corrosion of a cast aluminum pump casing due to excessively high flow rate of the coolant.

Cavitation-corrosion is a special form of erosion-corrosion. It is caused by water bubbles produced by a high-speed impeller, which then collapse and cause pits on the metal surface.

• streamline the piping to reduce turbulence
• control fluid velocity
• using more resistant materials
• using corrosion inhibitors or cathodic protection to minimize erosion corrosion

Corrosion and Its Prevention (5-day module)
Corrosion and Its Prevention (2-day module)
Corrosion, Metallurgy, Failure Analysis and Prevention (3 days)
Marine Corrosion, Causes and Prevention (2 days)
Materials Selection and Corrosion (2 days)
Stainless Steels and Alloys: Why They Resist Corrosion and How They Fail (2 days)

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