Eliminating Woods Nickel
Q. We are attempting to apply a platinum plate to stainless steel. Our customers will not allow us to use a Woods nickel strike. Is there any other process that you can suggest that would not involve a chloride nickel strike? T. S. B.
A. Here is a procedure that may work for you:
- Electroclean the parts.
- Descale in a nitric/sulfuric/fluoride solution for one minute.
- Electrocleaning cathodically in an alkaline descaler at 80–100 ASF for 1–2 minutes.
- Activate in a 50% solution of hydrochloric acid. Remove from this acid dip upon the appearance of noticeable gassing.
- Place in a chloride platinum plating bath. This will give you a strike on the surface. You can then deposit a heavier layer of platinum using a platinum plating bath designed for heavy deposits.
It is important that you perform vigorous rinsing between the various steps.
Masking is employed in most any metal finishing operation where only a specifically defined area of the surface of a part must be exposed to a process. Conversely, masking may be employed on a surface where treatment is either not required or must be avoided. This article covers the many aspects of masking for metal finishing, including applications, methods and the various types of masking employed.
Why is it important for you to know this?
A primer on this inexpensive and highly efficient process.