How can pipes be protected from corrosion?

Pipes can be effectively protected from corrosion through various methods, including coating, galvanization, and cathodic protection. Each of these techniques addresses the prevention of corrosion in unique ways.

Coating involves applying a protective layer over the surface of the pipe. This layer acts as a barrier that prevents corrosive substances, such as water and oxygen, from reaching the metal surface. Common coatings include paints, plastic linings, and epoxy coatings, which are designed specifically to resist corrosion.

Galvanization is the process of applying a layer of zinc to the surface of the pipe. Zinc acts as a sacrificial anode; if the pipe begins to corrode, the zinc will corrode first, protecting the underlying steel or iron beneath it. This method is widely used for pipes exposed to harsh environmental conditions.

Cathodic protection is a technique that involves using an external electrical source to inhibit the electrochemical reaction responsible for corrosion. By applying a negative voltage, the pipe can be made the cathode in an electrochemical cell, thereby preventing corrosion.

The other options do not effectively protect pipes from corrosion. Increasing the temperature could potentially accelerate corrosion rates rather than prevent them. Using only metallic pipes does not guarantee protection, as many metals are susceptible to corrosion,