PRINCIPLE OF CORROSION

Posted On :   11/10/2019||03:36:03pm

Posted By :Sreeraj N

Corrosion is an electrochemical process involves the flow of electrons across the metal surfaces immersed in the electrolyte. Oxidation or metal loss occurs at the anode. Reduction or gaining occurs at the cathodic area.

For easy remembering

OIL RIG

“OXIDATION IS LOOSING REDUCTION IS GAINING.”

          (ANODE)                         (CATHODE)

Mainly corrosion consists of below four points.

1. ANODE

2. CATHODE

3. ELECTROLYTE

4. METALIC PATH.

Steps involved in corrosion cell.

  1. Metallic ions leaving from the anode by releasing electrons.

  2. These released electrons will meet hydrogen ions from the electrolyte in the Cathode area.

  3. One hydrogen ions will combine with one electron and its form Hydrogen atom. These hydrogen atoms combine and convert it into Hydrogen gas. This will release from the cathode or trapped into the metal lattice & this will cause metal embrittlement.

  4. Sametime metal ions will combine with hydroxyl ions in the electrolyte and its form metal hydroxide or Rust.