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प्रश्न
Distinguish between anodic and cathodic coating.
फरक स्पष्ट करा
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उत्तर
| Sr. No. | Anodic coating | Cathodic Coating |
| 1. | This type of coating protects the base metal sacrificially. | This type of coating protects the base metal because of its high corrosion resistance and noble behaviour. |
| 2. | The coating metal is at lower electrode potential than base. metal. |
The coating metal is at a higher electrode potential than the base metal. |
| 3. | Corrosion of base metal does not enhance even on breaking “anodic coating” as it heals its film | Corrosion of base metal enhances, if there is a small cut in coating |
| 4. | Eg. Galvanising, i.e., Zn coating on iron/steel | 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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