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August 07, 2004
Subject: Re: ? on Master Cyl piston
The black coating is indeed black oxide. It is not any form of paint.
We call it Chemical blacking. (or kemmy blacking - in conversation)
Can be done as a Hot or Cold process. - hot is better for durability.
First done on gun barrels I believe.
You can buy the cold process as a kit.
It only protects against surface rust when oiled, but it does help prevent
deep rusting.
it does provide a harder durable surface. It is also used to make steel
items look pretty !!
Try not to rub it off - it is only a thin layer - unless badly scored a bit
rubbed off blacking will not be a prblem, its the seals that seal.
Anodizing is only done on Aluminium as far as I'm aware.
The only pistons I recall getting a chrome plate were the caliper pistons,
but this was replaced with Tin nickel plating.
There may be more knowledgable people out there to correct me if my memory
is not quite correct. (but I still do currently specify chemical blacking
when designing prototype car parts /parts for test !!!!)
Alan
(ex Lockheed and Borg Beck )
"alan.east-jones" < alan.east-jones@... > 33373
Posted on August 7, 2004 12:54 PM
Posted to category(s) Body | Braking System | Cooling System | Engine (internal) | Lubrication System | Restoration
