Question

Describe any two of the techniques used for preventing corrosion of metals.​

Answer 1

Answer:

There are two main techniques for achieving sacrificial coating: cathodic protection and anodic protection.

Explanation:

Cathodic Protection

The most common example of cathodic protection is the coating of iron alloy steel with zinc, a process known as galvanizing. Zinc is a more active metal than steel, and when it starts to corrode it oxides which inhibits the corrosion of the steel. This method is known as cathodic protection because it works by making the steel the cathode of an electrochemical cell. Cathodic protection is used for steel pipelines carrying water or fuel, water heater tanks, ship hulls, and offshore oil platforms.

Anodic Protection

Anodic protection involves coating the iron alloy steel with a less active metal, such as tin. Tin will not corrode, so the steel will be protected as long as the tin coating is in place. This method is known as anodic protection because it makes the steel the anode of an electrochemical cell.

Anodic protection is often applied to carbon steel storage tanks used to store sulfuric acid and 50% caustic soda. In these environments cathodic protection is not suitable due to extremely high current requirements.

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Answer 2

Techniques for preventing corrosion of metals :

There are the following techniques that are used to prevent the corrosion of metals.

  → Alloyed steel.

  → Barrier coatings.

 → Alloyed steel.

• As we know that it is the most effective method for corrosion prevention.

• By combining the metal properties, strength, resistance can be provided to the product.
• Alloyed steel provides greater flexibility to metals.

• It provides resistance power to different conditions for different alloys.  

  → Barrier coatings.

• As we know that it is the cheapest method to prevent corrosion.

• Paint, powder, plastic, etc are used for coatings metals.

• A thin film can be formed by sticking powders, to the metal surface.

• As we know waxes, plastic is sprayed onto corrosion metal surfaces to prevent corrosion. the paint coating is also used to prevent metal corrosion.