WHEEL CORROSION

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Paul
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Re: WHEEL CORROSION

Post by Paul » Sun Nov 26, 2017 5:43 pm

Agree (sadly) looks very much like impact damage / chips to me and water has got it under the laquer.
1st Sapphire Blue SD
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Current Sapphire GTS
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andreas
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Re: WHEEL CORROSION

Post by andreas » Sun Nov 26, 2017 6:11 pm

Are other wheels less prone to this sort of damage? I've ordered 20" Sport Design wheels on my new car, I think these might be silver paint finish.
Macan S collected 4 Dec 2017 - Jet Black, 20" SportDesign wheels, Agate/Pebble leather, 18-way seats, comfort memory, seat heating, Light Comfort pack, Pano roof, Bi-Xenons with PDLS, Surround View, PASM, Power Steering Plus, spare wheel, towbar.


Kasfranks99
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Re: WHEEL CORROSION

Post by Kasfranks99 » Sun Nov 26, 2017 7:53 pm

andreas wrote:
Sun Nov 26, 2017 6:11 pm
Are other wheels less prone to this sort of damage? I've ordered 20" Sport Design wheels on my new car, I think these might be silver paint finish.
12 months on and my sport designs look like new. But they have been Gtechnic C5 coated and it’s garaged too.
GTS 😀


Salty
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Re: WHEEL CORROSION

Post by Salty » Sun Nov 26, 2017 9:44 pm

My Macan is about 3.5 years old now and the wheels are ok except where I curbed one of them in a very annoying multi story car park. There is no stone chip damage On them. I’ve been quoted £150 per wheel to refurbish.
The centre caps however are all corroded and I’ll need to replace them. The wheels are only on the car during the summer and I have tried to look after them so I’m disappointed that they have corroded so badly.
Grey 987 Boxster S (sold)
White 987 Boxster S (sold)
White Macan S Petrol, (sold)
Rhodium Silver metallic Macan GTS
Aqua Blue 981 Boxster S (sold)
Midnight Blue 718 Boxster GTS


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Rab J
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Re: WHEEL CORROSION

Post by Rab J » Sun Nov 26, 2017 10:31 pm

Diamond cut alloys have as much corrosion resistance as an Austin Allegro so stay away from them unless your prepared to refurb every couple of years.
Macan GTS Carmine with 21" black sports classics ---Gone
991.2 GTS Carmine 2WD
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ALEX
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Re: WHEEL CORROSION

Post by ALEX » Mon Nov 27, 2017 8:46 am

Thanks for all your comments guys, I will wait until Spring after salt and gritting has stopped before I get them refurbished.
Ordered August 2014 Delivery
hopefully September 2015
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danish3
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Re: WHEEL CORROSION

Post by danish3 » Sat Oct 12, 2019 10:01 pm

I have the 21” turbo diamond cuts on my GTS. No sign of stone chips but have corrosion on one rear wheel. The car is only 18 months old. Wheels were gteched. Took to mid sussex and they initially said it would be covered under warranty. Porsche uk however are planning to send an independent body works specialist to look at it. The guy phoned me yesterday to arrange an appointment but said it is unlikely Porsche will accept responsibility. Says Mercs, BMW etc are the same.
Interesting to hear centre caps are rusting as mine are too.


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Bazza06
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Re: WHEEL CORROSION

Post by Bazza06 » Sun Oct 13, 2019 12:19 pm

The pictures remind me of the same type of corrosion I had on a Boxster which I noticed about 6 months after purchase.

I raised it with the dealer I purchased from, but they said it was the acid within the wheel cleaner I was using which at the time was an Autoglym product.

A couple of weeks later I was at a motor show at which Autoglym were exhibiting. I related my experience to them, and they flatly refused to accept it was the fault of their product. They invited me to their HQ, examined the wheels and concluded it was a manufacturing defect.

They called their contacts at Porsche who arranged another inspection of my wheels and after consulting with Germany confirmed it was a defect and replaced all wheels.

Autoglym were brilliant as was the courtesy valet they provided whilst I was waiting.

Fast forward a few years when the owner of a Macan SD and i started to see corrosion around the wheel valves (see below). I use Bilt Hamber on the wheels and the car was always hand washed.

I took it to the dealer, and they replaced all the valves but did try to infer it was acid in the wheel cleaner which, as both Bilt Hamber and Autoglym confirmed, does not have any.

IMG_7578.JPG



Bigboyrolo
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Re: WHEEL CORROSION

Post by Bigboyrolo » Mon Oct 14, 2019 2:25 pm

danish3 wrote:
Sat Oct 12, 2019 10:01 pm
I have the 21” turbo diamond cuts on my GTS. No sign of stone chips but have corrosion on one rear wheel. The car is only 18 months old. Wheels were gteched. Took to mid sussex and they initially said it would be covered under warranty. Porsche uk however are planning to send an independent body works specialist to look at it. The guy phoned me yesterday to arrange an appointment but said it is unlikely Porsche will accept responsibility. Says Mercs, BMW etc are the same.
Interesting to hear centre caps are rusting as mine are too.


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All alloy wheels can and probably will corrode in normal use, especially in climates where salt is spread on roads. Aluminum alloy corrodes easily, ask an aircraft or marine engineer. Obviously the car maker demands high quality and I am sure suppliers to Porsche, Mercedes etc do their best they can to protect the alloy with paint and/or lacquer. Small impacts from road debris may be all it takes to allow moisture through the protection to get down to the alloy, even with Gtechnq applied. Diamond cut are more prone because they just have lacquer applied on to the machined alloy. They can only be repaired by skimming the alloy from the corroded/damaged area, and there is a finite limit to how much alloy can be skimmed to retain wheel design/strength integrity. So it's hard to expect the same long life finish integrity as we expect from bodywork.
After two repairs to my Jaguar XJ diamond cut wheels, I had them painted, it proved to be far more durable and still looked good years later. I had my 19" classics painted VG to match the car, by a good specialist, the finish was better than original, and again, proved durable. I doubt mass produced wheels are finished to same standard. So with wheels operating in a hostile environment, damage and subsequent corrosion is hard to avoid, perhaps we should anticipate a wheel refurb every 2yrs/30,000 miles as routine maintenance.
Centre caps, though, don't rust - they're plastic, and if I recall made in Italy, and should last longer.

IMG_9724.jpg

IMG_0823.jpeg

"Every year is getting shorter, never seem to find the time" Pink Floyd.
BMW 2019 440i Convertible
2016 Panny S e-Hybrid Black/Cream sold @3yrs old Apr 19
S VG/Luxor, sold @ 9700 miles March 18
SD Dark Blue/ Pebble, sold @ 16k miles Dec 16


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