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Letter 6095
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Tom Pullizzi |
I agree with Tom, I would not use butyne diol as a stress controller, on the contrary.
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I agree that 1,4 butyne diol is not a good stress reliever. According to Raub and Muller (in 1963) the optimum concentration of butyne diol for stress relief is 8 mm/L (ie 0.69 g/l) . This could become difficult to analyse and control without good analytical techniques. Most diol containing solutions seem to operate at about 2 g/l.
Other levelers are known, such as coumarin and thiourea; the latter being the best. However, it is toxic and may have severe problems with discharge limits.
For a mirror bright deposit, I suggest you talk to your supplier as he will know the chemistry of the system better than anyone.
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Trevor Crichton |
Hello all,
Procedure for the determination of butynediol. I am trying to
determine the concentration of butynediol in an electroplating bath
used for bright nickel plating. Any suggestions for doing this would
be greatly appreciated!
Nathan Carrington
Process Electrochemist - Knoxville, TN, USA
I'm not a chemist and don't know the methods, Nathan. Sorry. But it's used as an auxiliary brightener and I can tell you that ASM Metals Handbook Volume 5 says it's typically used between .01 and 0.5 oz./gal. Hopefully the typical concentration is a start on what procedures would b appropriate. Good luck.
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