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That's the reaction between two metals that can result in corrosion. Ever seen a hunting knife with a brass guard stored in a leather sheath and the brass and the leather turn gooey green? That's an extreme example. Less extreme examples aren't so visible. Electrolysis can eat away at the tang inside a handle or under the scales to the point where the handle falls off or the scales separate from the handle. This is one reason why we're always preaching sealing up a handle with a waterproof epoxy since the process only happens when there is some water available to support it. This is also why everything you read about soldering guards stresses that you make darned sure you have neutralized the flux. I suspect the same could be true with brazing ...
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