Compressive Stress

Ask an Expert From: Products Finishing, , from Powder Coating Consultants, Div. of Ninan, Inc.

Posted on: 10/1/2005

Question: What can cause compression stress in a nickel sulfamate plating bath?

Question:

What can cause compression stress in a nickel sulfamate plating bath? We use this bath for electroforming and find that we constantly have to battle the build-up of compressive stress in the deposit. V. M.

Answer:

Some of the common things that can cause a build-up of compressive stress in a nickel sulfamate bath are as follows:

  1. Increased concentration of sulfamate ion oxidation products
  2. Decrease of the pH of the plating solution
  3. Decreased concentration of chloride ion in the plating solution
  4. Poor agitation of the plating bath solution
  5. High anode current density

It is critical that you operate an electroforming bath under very tight tolerances.


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