Q. Are there any non-proprietary stress reducers that can be used in a nickel sulfamate plating bath? —M.P.
A. There are many additives that can be used to reduce stress in a nickel sulfamate plating bath. The key component of all of them is an organic molecule containing a sulfur atom.
Some examples of stress-reducing additives are saccharin and the sodium salts of naphthalene trisulfonic acid and dibenzene sulfonic acid. I suggest you work with your chemical vendor to obtain the best additive for your particular bath.