What is Pitting Corrosion? (R)

What is the meaning of Pitting Corrosion? 

Pitting corrosion may be a major trouble for metals, inflicting small pits or holes that weaken their structure. Pitting corrosion is greater competitive than uniform corrosion because it concentrates corrosive factors at precise sites.

Reason for Occuring the Pitting Corrosion

Pitting occurs when the protective layer of the metal is destroyed and contaminants attack the surface, forming tiny holes. This is caused by defects, contamination, or physical damage to the metal surface. The affected area will melt, but the rest of the metal will remain relatively unaffected.

How to verify the level of Pitting Corrosion

You can use the following techniques: Visual inspection: Simply look for small holes or craters in the metal surface and assess their size and depth. Measure surface roughness to detect increases in roughness due to pitting corrosion. Non-destructive testing (NDT): Methods such as ultrasonic testing and magnetic particle testing can detect and evaluate pitting corrosion without damaging the metal.

How to prevent this

Here are a few sensible steps: Choose Corrosion-Resistant Materials like stainless steel. Apply Protective Coatings: Using paints, epoxy coatings, or galvanizing can create a barrier between the steel and corrosive substances, stopping pitting. Implement Cathodic Protection: Techniques like sacrificial anode structures or inspired cutting-edge structures can assist inhibit pitting corrosion through presenting a terrible fee to the steel.

Repairing Method for Pitting Corrosion?

Consider the following methods: Mechanical Repair: For minor pitting corrosion, techniques such as grinding, sanding, and polishing are used to mechanically remove corrosion products.

Chemical treatment: Pickling or passivation is used to remove corrosion products and restore the protective layer of the metal.

Welding or Repair: If severe, cut out the scar and replace it with a new metal patch or weld repair.

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