Electropolishing 301 stainless steel

[grayseal]

We are experiencing quality problems with electopolishing .025" thick x 7" round discs of 301 stainless steel. The supplier says that water spots are the cause.
The parts are blanked on a die and then washed. The detergent is an alkaline material and is used in an industrial spray washer with fresh water rinse. Composition by weight % is as follows:
5-10 % potassium hydroxide
5-10 % sodium silicate
10-20 tetrapotassium pyrophosphate
5-10 % 4 Na ethylene diamine tetra acetate
After washing the parts they are heated in an oven at 600 degrees F for one hour. The supplier claims the electopolishing operation will not remove the spots.
Is this possible?
grayseal

 

[robo123]

I suggest you should go back to the Stainless Steel raw material supplier and ask for a better material with a good finish also. The material our supplier supplies is og a godd finish. Secondly if you punch with a good die and avoid the burrs(Fine Blanking), I don't find any reason why you should go for a polishing operation itself for any type of function.

Please try it out.