Topic: DIFFUSE NICKEL CAD PLATING
WE HAVE RECENTLY DEVELOPED A PROBLEM WITH OUR NI-CAD PLATING. THE CHROMATE (OR COLOR) IS RUBBING OFF OF THE PART AFTER THE BAKING PROCESS. WE HAVE REPLACED THE CHROMATE WITH A NEW BATH AND IT SEEMS TO HAVE HELPED, THE COLOR WILL LAST THRU THE 630 DEG. FOR 30 MIN. BAKE BUT OUR CUSTOMER PERFORMS A SECONDARY BAKE AT 500 DEG. FOR 2 HRS. AFTER THIS BAKE THE COLOR WILL RUB OFF WITH VERY LITTLE FRICTION TO A SILVER LAYER AND LOOKS LIKE ASH.
DOES ANYONE HAVE ANY THOUGHTS?
FOR THAT MATTER DOES ANYONE KNOW THE FUNCTION OF THE CHROMATE FILM?
THANKS FOR THE HELP.