We must electro-strip the part to bare metal
using sulfuric acid.After electro-stripping, we will also glass
bead blast the parts, front and back, for a
clean starting surface.
When dealing with pot metal, the first issue to
address is pitting.The polisher does so by using a small grinder
on the surface to remove as much pitting and
dead metal as possible.
Once the surface had been ground as far
as safely possiblethe visible areas of the part were DA
sanded to a smoother finish.
After all of the sanding was completed, any remaining pits were
drilled to remove dead metalIn some instances the spots were completely drilled out, while
they were simply dimpled out in others.
Before any repairs are made to the pits, the part is
ran cyanide copperto seal up the pot metal. This thin deposit not
only seals up the part, it also promotes
adhesion for repairs.
Now that the pot metal has been successfully
sealed up in cyanidecopper the polisher uses solder to fill
any of the pits that were drilled or dimpled out.
The next step involves DA sanding the solder to
the same plane asthe parts surface. Once that is completed, the
part is ready for acid copper, which is a higher
The parts were hand racked, cleaned in a caustic bath, and placed in the acid copper tank for the appropriate time. Now the copper is used to
smooth out the part and remove any minor imperfections.
DA sanding is now performed to level out the surface in
preparation for nickeland chrome. If any small imperfections remain, the parts will be ran acid copper again.
If the part is DA sanded out without any imperfections remaining, the part
is polished to a mirror finishfor nickel and chrome plating.
After the polished part is racked and cleaned again; then it's placed in the nickel tank for the required
amount of plating.Once finished, if no imperfections were found,
the part was ready for chrome.
Before the part could be placed in the chrome tank, the part is
outfitted with an anodeto help throw chrome plating in to the deep areas of the part.
This is done to avoid any nickel shading.
Removed from the chrome (anode removed), the part
is thoroughly rinsedand cleaned to make sure the plating is flawless.
If the part passes QC, it is ready to ship.
It's easy to see that pitting is no longer an issue with these pot metal parts.
The finished product is betterthan it was when new.
First we must electro-strip the parts
to bare metalAfter electro-stripping, we will also
glass bead blast the parts, front and
back, for a clean starting surface.
The part is checked for any damage, dents, or dings. The polisher will then
straighten & remove damageas best possible.
With high spots knocked down and low spots
hammered outa light grind is applied to the surfaces to
level out the material, and to see what
additional straightening is required.
The same principles exercised in the previous step are used on a smaller
scale to straighten/repairthe smaller surfaces areas of the part.
Any damage or imperfections that are not fully removable with hammering and grinding are
filled with solder.
An air file is used to level off the surface and make sure it is as
flat and straight as possible.
Now that the repairs and straightening have been made, the grille is DA sanded, followed by being