For a fictional text, I was wondering whether, and how, electronic components are affected by oxygen and moisture in the air, natural background radiation etc, over the course of years or decades.
Silicon, for example, is usually protected against corrosion by passivation. A lot of plasticizers slowly evaporate or decompose, so plastics become brittle over time. I'm not sure about copper, I think it might be fine as long as it's dry enough. Another source of degradation might be temperature stress (freezing / thawing) leading to broken connections.
I realize this is a pretty broad question, but I was hoping there are some typical examples, maybe there's typical storage requirements for electronic equipment or typical failures of components that have been in, say, a mountain hut for too long. I would guess that there might be some sources from the cold war on topics like that (think bunkers).