Galvanic corrosion is a type of corrosion that occurs when two different metals with different electrical potentials are in direct contact with each other and an electrolyte, such as water or soil.

This creates an electrochemical reaction that can cause one of the metals to corrode more quickly than it would otherwise.

In pipelines, galvanic corrosion can occur when different types of metal are used in different parts of the pipeline, or when different types of metal are used in conjunction with each other, such as with metal fittings or flanges. The corrosion can cause damage to the pipeline material and can increase the risk of leaks or other safety hazards.

Galvanic corrosion can be prevented or mitigated by using corrosion-resistant materials, such as stainless steel or certain plastics, throughout the entire pipeline. Additionally, cathodic protection can be used to reduce the risk of galvanic corrosion by controlling the electrical potential of the pipeline and reducing the risk of an electrochemical reaction.

It is important to properly design and construct pipelines to prevent galvanic corrosion, and to regularly inspect and maintain pipelines to detect and address any signs of corrosion as soon as they occur.