90% of the cost of Chroming is the preparation. And, as Wayne sys, If'n
you ain't good at this, leave it to the plater. The Copper gives it it's luster/color hue, the Nickel gives it the silvery look, and the actual Chrome is only 1-2 atoms thick, really thin. This gives it the shine/brilliance that we all love, and any blemish in the base metal part will be enhanced by the process, that is, made to be very apparent. Grinding marks, dents, scrapes will all show, because all you're doing is laying a nearly transparent layer of shine over the part. Or so they told me when I worked in a Westinghouse plant in the late 50's. Beside the chrome shop they had a giant louver press, but that's another story..... Regards, Ray Y'all have a great holiday season, and tell all those special people that you love them. On Dec 17, 2004, at 7:36 AM, Wayne Graefen wrote: If there is oil or grease or tar or similar on the parts you need rechromed, then there would be some very minor help to getting them clean because that 'stuff' would contaminate the plater's tanks.? First thing they do is reverse the electrolysis that applied the chrome.? In a matter of a minute, it falls off.? Then if there are layers of copper and chrome ("triple plate") they do the same.? Next is a pickling process which is also electrolytic to remove the rust and clean any impurities from the surface of the metal.? If this is a stamped part like a bumper, they now go to a press and straighten.? After that they step up to a grinder and have at it.? At the grinder is one of the differences between a good and bad plater;? a bad guy on the grinder can ruin any part really quickly.?? Pits can be filled now either with brass or with special welding rods depending on the composition of the part.? Some belt sanding is typically done next to smooth the grinding and filling.? Assuming all looks good now, layers of copper to further smooth the surface, nickel and chrome are separately applied and may get some polishing between layers.? The amount of time in the tank determines the thickness of the plating.? Several of the above steps can be shortened in time and some eliminated all together.? And THAT is where the real pricing difference comes in between one plater and the next.? With plating you pretty much get what you pay for.? Its time, materials and labor. ************************************************************* To unsubscribe or set your subscription options, please go to http://lists.psu.edu/cgi-bin/wa?SUBED1=l-forwardlook&A=1
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