Bermy, I believe it's from the salt in the sap. Salt eats up magnesium. Around here the oak sawdust does the same thing to my saws. But yeah, take the saw home and blow off all the crud from around the sprocket at the end of the day.
They don't hinge exceptionally well but good enough. The wood is stringy and can hold a lot of water, so make sure your chain is sharp and don't crowd the saw or it may bind. It's also a bit heavier than you think. But yeah, throw them for sure.
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