MARTY PARTRIDGE METAL FINISHING - CHATSWORTH, CALIFORNIA
Use 2 oz/gal Nickel Carbonate with 14 oz/gal Potassium Cyanide, make the parts cathodic at about 6 to 8 volts, stainless anode, for about 5 minutes. This will "activate" (remove nickel oxide) in most cases. However, if it is a heavy aged or burned on nickel oxide, you will still have to use electrolytic acid activators, preferable NIckel Chloride Strike.
Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.
If you are seeking a product or service related to metal finishing, please check these Directories: