Had exactly the same problem with the Y spoke 18" wheels except corrosion more widespread, they were replaced after a year.
Now same problem again (in under a year on the replacements) around the centre of wheel just as shown on photo of earlier post. Went to dealers yesterday and now going to replace under warranty again next week.
I asked if this was going to be an annual event, they siad BMW were aware that there was a manufacturing problem and should be sorted on the new ones- time will tell!
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