A study is first made of the galvanic effects which occur when dissimilar metals are coupled together in hot aerated pasteurized milk. The following metals and alloys, used commercially in the construction of milk pasteurizing equipment, are included: Nickel, copper, aluminum, chromium‐nickel, and chromium‐nickel‐iron. It is next pointed out that galvanic corrosion can occur, due solely to a difference in temperature of identical metal surfaces exposed to a given solution. A cell of this nature is studied with nickel electrodes in milk. It is concluded that the temperature effect is of little importance under pasteurizing conditions, and that in this instance the galvanic effect of differential aeration can be of greater influence than that of temperature difference.