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NiCl2 vs MgCl2 in a Nickel speed bath
January 26, 2010
Dear all,
Can anyone tell me reason to change from NiCl2 to MgCl2 content in a Nickel Sulphamate bath?
The main reason I hear is related to less tensile stress. Is there any other? (formation of contaminants, brittleness, etc)?
What would be the correct choice for the wetting agent, Sodium Lauryl Sulfate? Which concentration? Any other suggestion?
I'm working with depolarized S anodes, 600 g/l Ni sulphamate and 38 g/L boric acid.
Thanks for your support.
Best regards,
Engineer - Portugal
^- Privately contact this inquirer -^
February 7, 2010
Chloride in any form causes tensile stress. However, chloride is necessary to help dissolve the anodes and keep them from polarizing. Magnesium chloride causes less stress than nickel chloride by only a small amount.
Sodium Lauryl sulfate is OK to use. O.3%. Keep other impurities out of the nickel.
Low Current dummy plating, 5 amps/sq ft. using a corrugated clean steel cathode, used periodically. The typical is 90 degrees corrugations of 3-6 inches deep. (dark streak at the low CD ares in a hull Cell will tell you when to dummy plate)
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Don Baudrand Don Baudrand, Consultant  Poulsbo, Washington |
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February 7, 2010
I made a mistake in the sodium lauryl sulfate recommendation. It is a powder used at 0.4 g/L in nickel sulfamate plating solutions.
Don
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Don Baudrand Don Baudrand, Consultant Poulsbo, Washington |