P Distinguish Between Anodic and Cathodic Coating - Applied Chemistry 2

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Distinguish between anodic and cathodic coating 

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Solution

  Anodic coating    Cathodic Coating
1 This type of coating protect base metal sacrificially. 1 This type of coating protect the base metal because of high corrosion resistance and noble behaviour
2 The coating metal is at lower electrode potential than base m
etal.
2 The coating metal is at higher electrode potential than base metal.
3 Corrosion of base metal does not enhance even on breaking “anodic coating” as it heals its film 3 Corrosion of base metal enhances, if there is a small cut in coating
4 Eg. Galvanising i.e. Zn coating on iron/steel 4 Eg. Tinning i.e. tin coating on iron/steel/copper/brass.

 

Concept: Factors Affecting the Rate of Corrosion Relative Area of Anodic and Cathodic Parts
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2017-2018 (December) CBCGS
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