Does Stainless Steel Pipe Need Cathodic Protection

Does Stainless Steel Pipe Need Cathodic Protection

Cathodic protection refers to the method of applying cathodic current to the metal material to be protected so that only the reduction reaction takes place on the cathode, while the oxidation reaction takes place on the auxiliary electrode, so that the metal is protected from corrosion due to taking away electrons.

Appropriate cathodic protection can protect the passive film of stainless steel and reduce the uniform corrosion of the sample surface. When the metal surface is polarized by the cathode, the adsorption of Cl - on the metal surface is blocked, which avoids the destruction of the passivation film and reduces the risk of local corrosion.

Pipeline cathodic protection is an internationally recognized anti-corrosion technology, and the anti-corrosion effect is particularly significant. Generally speaking, cathodic protection is required for pipelines that will corrode and pipelines with high requirements for pipeline rust prevention, such as buried pipelines and pipelines used in water. Overhead pipelines generally do not need cathodic protection, because most of the air (dry, normal pH, no pollution) will not cause corrosion.