Head to your local shop. If it's only a few spokes, they should be able to replace them & true the wheel. If it's looking like more are pitting & going to also snap, you may be better off buying a new wheel. They will transfer over your cassette, rim strip, tire & tube. In the long run, if it looks like more will pop, this will likely be the cheaper fix. Spokes run about $1.50 each & a wheel true can run from $15 - $30. These are rough estimates.
Now, for the cause... We usually see this on coastal areas. It's a very common problem. Typically, though inland it's not so bad. Keep your bike & spokes wiped down with an anti-corrosive. Your bike shop probably sells or can recommend one. Don't store your bike in the garage near harsh chemicals (pool chemicals, muratic acid, stuff like that).
Good luck! Diane
The World is a Better Place on Two Wheels!
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