You are probably safe personally (though who can say for sure in these days of Artificial Intelligence?) from the most obvious signs of corrosion, as seen in old cars:
photo by PookieFugglestein
reinforced concrete structures:
photo of Autobahn bridge by Karl-Heinz Wellmann
and leaky batteries:
photo by MarkBuckawicki
but there are more insidious types of corrosion.
Oh, beware, my lord, of jealousy!
It is the green-eyes monster which doth mock
The meat it feeds on.
says wise Iago, a man so corroded, and perhaps with jealousy, that his mind no longer even understands itself; and then there is the corrosion of greed, fear, hatred...
As with the more visible sorts of corrosion, they can almost all be cured; but, always, the sooner the owner takes action the better.
Thing Not To Do Today: corrode. This word comes from the Latin word corrōdere, to gnaw to pieces, from rōdere, to gnaw.
(This means it's basically the same word as rodent: and you wouldn't want rats in your brain, would you?)