How does a dielectric union prevent corrosion?

A dielectric union effectively prevents corrosion by separating two different metals from touching, which is crucial in systems where dissimilar metals are used. When two different metals are in direct contact with each other in the presence of an electrolyte (such as water), it can create a galvanic cell. This process leads to electrochemical reactions that cause one of the metals to corrode more quickly than it would on its own.

The dielectric union utilizes a non-conductive material, typically plastic or rubber, to create a physical barrier that inhibits the flow of electric current between the two metals. By preventing this contact, it stops the galvanic corrosion process, enhancing the longevity and reliability of the plumbing or piping system. Thus, using a dielectric union is a proactive method to manage corrosion issues in installations where different metals are used in conjunction.