Why did lemon juice wear away the copper coating on my sink? How Do I cure it?

Last night I was making a cake with my friends and some lemon juice got on the sides of the sink. The next morning I looked at the sink and there were pink spots all over it from whatever was on top of it wearing away. Do I have to get a new sink or like is there a coating I can buy? And if so how much?
Thank,
Zach

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