This complete guide explains what causes electrical panel corrosion, how to spot it early, and what you can do to stop it—plus the best products to help protect your system for years to come. Corrosion happens when moisture meets metal inside or around your breaker box. 1) Circuit breakers are mechanical devices and, like any mechanical device, corrosion can cause it to freeze up and not trip when too much current is flowing in the circuit. This will overheat the wires and possibly start a fire. 2) Aluminum corrodes into a crystalline white powder and, although. Written by Matt Pinkston, Operations Manager at Bright Electric— a licensed electrical contractor serving Evansville, IN for over 30 years. But when rust and corrosion creep in. Taking the cover off my electrical panel, I notice white flakes primarily on the hot bus bar just after the main breaker and under some of the individual breakers. The breakers I have removed for replacement show no problems on their conductors (they are being replaced because of circuits being. POST a QUESTION or COMMENT about the causes & frequency of occurrence of dangerous leaks or moisture in electrical panels. Rust in electrical panels, sources of water leaks into electrical panels: A Study and Report on Frequency and Causes of Rust & Corrosion inside of residential electrical. Once I had the correct breaker off (now reads 0 volts), I opened up the outlet and saw some corrosion on the wires and box itself. One of my problems is that I do not know when this water damage happened.