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Question
Distinguish between anodic and cathodic coating
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. |
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Factors Affecting the Rate of Corrosion Relative Area of Anodic and Cathodic Parts
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