I have a brass component showing signs of corrosion, namely dark reddish/brown spots splattered on it. It's my understanding that this could be signs of dezincification, caused by exposure to water, acid, or salt. Now, I've also seen a greenish/turquoise corrosion on brass as well which I've read is copper sulfates/carbonates as a result of copper oxidation. My question: is the green corrosion simply a later stage of dezincification, i.e. after all the zinc has been selectively leached away, the copper is the next element to react? Or is this type of corrosion simply the result of exposure to different types of chemicals that cause the copper to react and not the zinc?
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