Galvanic corrosion prevention measures

Galvanic corrosion prevention measures
It is important to anticipate the damage caused by galvanic corrosion when choosing equipment or equipment used in a corrosive atmosphere and minimize the damage by considering the following preventive measures.
① Selection of similar dislocation metals: Select metals that are located as close as possible to the galvanic system.
② Be careful not to cause contaminants (oil, welding spatter, etc.) on the surface. (Complete removal required)
③ External power supply method: It eliminates the potential difference by hanging the power source from the outside at the end of the cathode and anode parts. (Referred to as an external power supply method)
④ Sacrificial Anode method: A third metal (such as scavenger - zinc anode) that is more active is brought into contact with the two metals of the galvanic pair.
⑤ Sacrificial anode method: It is designed to be easy to replace the part that acts as anode when designing.
⑥ Area Effect: The surface area of ​​the anode is large and the surface area of ​​the cathode is small. Ie the surface area of ​​the Lessnoble or active metal side.