Author Topic: Green pitting in chrome  (Read 471 times)

adamb

  • Vintage
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  • Posts: 630
  • 1977 450SEL6.9
  • Location: London, UK
Green pitting in chrome
« on: 03 February 2021, 01:33 PM »
I've been cleaning up a bumper piece. After lots of washing and polishing (Autosol metal polish) I still have the green corrosion like flecks in the chrome. Any recommendations on how to eliminate the unsightly flecks without re-chroming?

Max-NL

  • Classic
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  • Posts: 148
  • W116 Enthusiast
  • Location: Netherlands
Re: Green pitting in chrome
« Reply #1 on: 03 February 2021, 02:04 PM »
Seems like the copper layer underneath the chrome is oxidizing. I'm not sure if something permanent can be done against it.
1971 R107 350 SL (Dad's)
1975 W116 280 S (Dad's)
1975 W116 450 SEL 6.9 #140 (Dad's)
1977 W123 230 (Mine)
1992 W124 230 CE (Mine)

ptashek

  • W116 Addict
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  • Posts: 2,163
  • W116 owner
  • Location: Ireland
    • History of ZV9485
Re: Green pitting in chrome
« Reply #2 on: 03 February 2021, 02:10 PM »
Unfortunately that's something only re-chroming will fix. As Max mentioned this is corrosion of the base copper layer underneath the chrome and nickel plating.
The only positive thing about it is that the copper patina slows down further corrosion.
1993 "Pearl Blue" W124 280TE
1988 "Arctic White" W124 200T
1979 "Icon Gold" W116 450SE (history, resto)

hamidagha

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  • W116 Enthusiast
  • Location: Birmingham UK
Re: Green pitting in chrome
« Reply #3 on: 04 February 2021, 10:43 AM »
Not directly related but for getting all the fine dirt off I use a ball of crunched up kitchen aluminium. I just gently rub the fine dirt off

adamb

  • Vintage
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  • Posts: 630
  • 1977 450SEL6.9
  • Location: London, UK
Re: Green pitting in chrome
« Reply #4 on: 04 February 2021, 12:56 PM »
Thanks for the info and the tips. This was a spare piece that's been buried in the corner of the garage. Was hoping to salvage it but, though usable, ultimately it's not as good as what's currently on the car. Incidentally, buying new chrome pieces from MB is expensive but when they come they are definitely an item of beauty that makes the owner proud of their 116.