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Chromed Carbs .. stripping the chrome off !

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AshimotoK0:
I took member  jojotut's CB750K0 carbs to Prestige Plating to get them to strip all of the plating as a PO had chrome plated them and the mounting bar as well.

It was  bit scary handing them over as I didn't quite know what state they would be in after reverse plating but pretty pleased with how they turned out for Steve. Sadly they had been triple plated and reverse plating doesn't remove the copper but I tried treating  a carb body in the all important 'Keihin' logo area and managed to buff off the copper and get a decent finish. OK they will never regain their original iridescent sheen but most 50 odd year old carbs lost that years ago anyway.
A lot of work still to do though but with carb sets costing around 500 quid a pop .. well worth saving.

Loads of doom and gloom Facebook keyboard warriors predicted disaster but that'l show 'em.

Prestige reckons that whoever had them chromed must have spent an absolute fortune getting them done.

 

K2-K6:
Interesting to find out this sort of process Ash.

Something that maybe of interest, photographic fix will strip copper chemically, obviously it's fortè is silver, Ag, but pretty effective in "consuming" copper based too.

Could be worth a test with sacrificial damaged component to assess on carb base metal in cautious approach and find any risk.

It would be C41 film fix to try it.

AshimotoK0:

--- Quote from: K2-K6 on June 30, 2024, 12:28:12 PM ---Interesting to find out this sort of process Ash.

Something that maybe of interest, photographic fix will strip copper chemically, obviously it's fortè is silver, Ag, but pretty effective in "consuming" copper based too.

Could be worth a test with sacrificial damaged component to assess on carb base metal in cautious approach and find any risk.

It would be C41 film fix to try it.

--- End quote ---

Interesting Nigel ... I did read that a mixture of Ammonia & Hydrogen Peroxide can be used ... problem is they are not my own parts and I would deffo have to experiment with a scrap part first.

SteveW:
Don’t know what the chemicals are but what about the stuff that etches the copper to make pcb’s.
Did it many years ago in my electronics lessons at school.

AshimotoK0:

--- Quote from: SteveW on June 30, 2024, 10:01:32 PM ---Don’t know what the chemicals are but what about the stuff that etches the copper to make pcb’s.
Did it many years ago in my electronics lessons at school.

--- End quote ---

That's ferric chloride Steve ( have 5litres at work for making  PCB's as you say)... It attacks alloy I think but could give it a try.  I have also used sodium persulphate for etching PCB's

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