I have a tiny bit of this discoloration/corrosion on my titania wheels as well, but it's limited to the lug bolt holes. Those look extremely bad for not being in winter conditions.

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Would this fall under some paint warranty?
Never seen anything this bad from non-winter conditions.

 

How do you wash your car and what wheel cleaner do you use? The only time I've seen this kind of damage before was due to very acidic wheel cleaners. A small chip in the clear coat or curb damage will allow the acidic wheel cleaner to get underneath the clear coat which creates those little white trails.

 

Meguiar's car wash, wheel brush and the garden hose...... all 4 wheels on both cars..........

 

If those wheels have been attached to the rest of the car you can easily see the heavy rust encompassing the rotors and calipers and that type o0f rust is from road salt/chemicals. Even the TPMS sensor valve stem is corroded. Looks like car has sat in salt water to be honest.

 

Both cars are excellent on snowy New England winter roads.... so yes to typical road salt/chemicals for the cars and their typical NE undercarriage appearance. The wheels/tires live in storage for the winter as we have dedicated winter wheels/tires ......

 

It's common on machine faced/clearcoated wheels, even if you don't expose them to salt. We have a set of Atreus rims on the S40 and one or 2 has a tiny bit of it. I think it's just bound to happen and is definitely exacerbated by clear coat damage (as someone said). Once a little starts, it continues to worsen.

 

I have the beginnings of this on one of the Zephyrus wheels on my '15 XC70, around the lug nut holes.

Like was indicated, it's a function of compromised clearcoat on machined wheels, maybe due to damage from driving (dirt roads kicking up rocks, a lot of driving in construction areas). I've only owned my car for less than a year and it was like that when I got it. One indication of the conditions my car previously lived in is when I removed the rear bumper cover to install a hitch I dislodged a pound or two of dirt, gravel that was caked onto the inside of the bumper cover, lol.

Only thing to do is to get the wheels refinished or get another set of wheels, which may be cheaper in the long run.

 

Only thing to do is to get the wheels refinished or get another set of wheels, which may be cheaper in the long run.

In my area, this would probably cost about $150-$200/wheel. Depending on the wheel, this could be the cost of a new wheel, or the low end of one.

 

I just had my wheels refinished by one of the best shops in the northeast (apparently...the owner was showing me photos of refinished wheels from various celebrity vehicles while we were chatting one day), and it was $160 each wheel (strip, fix if bent/cracked, refinish, paint, CNC machine cut surface, clear, mount/balance).

If you have OE wheels you like, it makes sense. For that price, you can get decent 17" or 18" wheels on Tire Rack. I had Ixions that I really liked, so it was worth the cost for refinishing.

 

Aluminium corrosion that started under the clear coat. Can't do much about it other than sand it all off and re-paint.