Corrosion due to velocity of fluid flow?

Q.  Which of the following corrosions are caused due to velocity of fluid flow in pipes?
- Published on 11 Sep 15

a. Bimetal corrosion
b. Cavitation corrosion
c. Galvanic corrosion
d. Intergranular corrosion

ANSWER: Cavitation corrosion

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    Discussion

  • Sravanthi    -Posted on 16 Nov 15
    - The deterioration of a metal by reaction with its environment is called as corrosion.

    - Different types of corrosion are as follows: Uniform corrosion, pitting corrosion, cravice corrosion, intergranular corrosion, etc.

    - Cavitation corrosion

    - This is a velocity related corrosion attack. Different types of corrosion caused due to fluid flow through pipes are erosion corrosion, impingement corrosion and cavitation corrosion.

    - These corrosions occur in piping systems. The protective films are removed from metal surface during this fluid flow through pipes. Vapour bubbles are formed in the fluid stream due to low pressure. Variations in velocity is caused due to discontinuities in flow path.

    - The protective film on the metal surface is removed as these bubbles hit the surface and burst.

    Bimetal corrosion:

    Intergranular corrosion: This corrosion occurs on the grain boundaries of some metals.

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