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letter 5019
How to analyze / control HNO3 - H2SO4 - NH4
- HF2 type desmutters?
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For the pretreatment of aluminium for Electroless Nickel, we use a
fluoride (NH4 - HF2) containing (nitric-sulfuric) acid mixture for
desmutting. Until now we have not found a easy way to analyze and
control the amount of fluoride in the bath.
Are there ways of doing this easy...? Special equipment might be
considered, however we have very few persons to do a lot of work, so
the method can not be very labor intensive... Any other suggestions
for analysis/control for these types of baths are more than welcome!
e.g. is the amount of Si or Mg in the bath determining for the
quality of desmutting/pickling? Anything else?
Roy Orbon
- Netherlands
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Look back a few weeks in the letters section. There were
several letters concerning this subject. No sense repeating
it because it is here.
James Watts
- FL
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Ed. note: Mr. Watts refers to letter
#4626.
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