Most likely the coating came off over time with use specifically unscrewing which exposed it to corrosion
Iām in this post and donāt approveā¦ Iām a good medicated ball of anxiety. Just donāt let me forget my meds or bad things might happen if I donāt do that thing I did two times prior. (Like washing hands) canāt start my day till the desk is clear. Note it doesnāt have to be clean just canāt have stuff on it. That stuff can go in a corner out of sight for all I care just canāt operate till the thing is done. Brains are dumb.,
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Whether itās carbon or magnetite, the point of why itās coated with is the same. Tons of brake calipers and other hardware from auto manufacturers are coated with zinc. The purpose of the coating is still to prevent corrosion. Fun fact, a lot of aftermarket parts for cars are cheaper because they donāt have any coating or protection, thatās why when people buy parts for their cars and they open the box, theyāre covered in an oily film inside a bag. This is the cheapest way for a aftermarket company to keep their stuff from rusting on the shelf and during shipping.
Anyway, I would argue that just like on the east coast of the US, if you have a rusty part on the car that is breaking down, and itās in for repair, replace it. Thatās common practice. Not necessary 100% of the time, but if youāre going for longevity and reliability, it might be easier to work on in the future if itās lest rusty. Maybe if your yoyo has a rusty axle or bearing, replace it. If itās starting to rust now, wiping rust off isnāt going to keep it from rusting again.