[The electron flow will be from the steel on the left to the brass on the right. The steel is undergoing oxidation, not the brass, so the steel will corrode. ]
When two different materials are welded or bolted in an electrolyte (sea water) the uncoupled corrosion rate of the least noble (anodic positive) is increased, and the uncoupled corrosion rate of the noble (cathodic negative) is decreases.
P0 is penetration of anodic metal without coupling
E (cell) = ER - EL Where, E cell is the potential of cell, ER is the right side electrode potential, and
EL is the Continue reading...