nine4t4 wrote:... grab all the silica packs...
There are some other options for preventing corrosion that might last a little bit longer than using small silica packets. One can buy really large silica packets that are designed to go into gun safes. An indicator on them turns a certain color when they have absorbed a given amount of moisture, and then they can be restored by putting them in the oven for a certain amount of time.
An old machinist's trick is to get a block of camphor from the (old fashioned) drug store, make a slit in the plastic with a pocket knife, and then put that into their tool chest. The camphor slowly evaporates over a period of months and envelops everything with a very thin rust resistant coating. When the camphor block is gone, put in a new one. From sporting goods stores one can buy packets of cardboard that slowly emit an anti-corrosion vapor to do sort of the same thing (a lot of bearings and auto parts come wrapped in VCI paper for the same purpose)--but the problem is it is hard to tell when they loose effectiveness.
Regarding galvanic corrosion, when two metals of different electronegativity are in an electrolyte solution you basically have a battery and metal atoms will leave one of the metals and attach themselves to the other piece of metal. I think that the parts would have to at least have drops of liquid present, not just high humidity, for that to happen though. For things stored in an unheated area (like a garage), rapid changes of weather from cold to warm during periods of humidity can cause drops of water to form on metallic objects. For things stored inside in a climate controlled room I would not worry too much about it.
