There *might* be corrosion where they meet, but refrigerant is not like water. So, you wouldn't get charge carriers that help galvanic corrosion. You have to have water (or something else that can complete an electric circuit with dissolved ions being moved from one point to another) in the system between the dissimilar metals to get galvanic corrosion.
If you do it right, there won't be any water inside the refrigerant loop at all.
If you have copper and aluminum both in water, then you have to worry about galvanic corrosion.
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