I believe those are two piece wheels you've got there.
If you want, you can try scraping the rust, but it might not help much. But if you want to give it a shot in hopes that its just surface rust, you can take the wheel off and have a competent person take the wheels apart (yes, each one of those studs is a functional bolt to hold the wheel together) and give it a thorough cleaning and put it back together.
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