Connector Corrosion Failure — Root Cause & 8D Correc...

What Is Connector Corrosion? Connector corrosion is the electrochemical or mechanical degradation of the contact interface in an electrical connector. It raises contact resistance, causes intermittent signal loss, and eventually produces an open circuit. In automotive and industrial systems, corrosion is one of the leading causes of intermittent CAN, LIN and Ethernet faults that are difficult to reproduce in the workshop. The failure is usually a system problem — seal material, plating choice and qualification conditions — rather than a single defective part. Symptoms Green or white powder (copper corrosion) or red rust (iron corrosion) on the pins Contact resistance that rises from milliohms to ohms, or a completely open circuit Intermittent CAN / LIN / Ethernet signal loss or communication error codes Pitting or material loss visible on the contact surface Discoloured, cracked or hardened connector housing and seals Affected Components Automotive connectors (engine bay, underbody, door harnesses) Industrial sensor and actuator connectors (M8, M12, circular connectors) PCB edge connectors and board-to-board connectors Terminal pins with tin, gold or silver plating Detection Methods Visual inspection (10-30x): check for discolouration, deposits and seal damage Four-wire Kelvin measurement: compare contact resistance against the specification, typically below 10 mΩ Salt spray (ASTM...