Low-cost batteries typically contain carbon-zinc cells. This same galvanic reaction is used in batteries to generate potential difference (voltage), or should we say electricity. The bigger the cathode area is in relation to the anode, the faster the active metal will corrode. The electric potential difference between various types of metals is what drives the accelerated corrosion as a flow of electrons from the anode to the cathode. It is always the anode, the less noble material that corrodes and dissolves into the electrolyte. When the two types of metal are in contact with each other and are covered with an electrolyte (water), then the more active metal (like aluminum) becomes anodic, and the passive metal cathodic. The issues of mixing different types of metals are very precisely documented in the engineering textbooks, it’s kind of important to point out that the occurrence of galvanic corrosion is not a new thing invited by liquid cooling enthusiasts.
In a humid environment, the steel screws will drive the corrosion of the aluminum which is much more active. Also, if you are using aluminum pop-rivets on steel parts, expect the rivets to give up after a while, especially if it’s exposed to humidity and rain. But, galvanic corrosion does not occur only with liquid cooling loops, one example is when you connect aluminum frames with steel screws. The base of the problem in liquid cooling is when you mix copper or nickel plated copper with aluminum parts, where the aluminum is the much more active material.
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