Hi technetters !
We are changing now our "  old thick black oxide "  ( 0.7 mg/sq cm )
followed by DMAB reduction to thin oxide ( 0.35 mg /sq cm ) followed by DMAB
reducer .Following my  previous question regarding  "conducting reduced
black oxide" some additional points arosed :
1 ) the thickness is being measured by stripping the oxide from dummy panel
( both reduced and not-reduced ) . The differences between " reduced " and "
not reduced " oxide are reasonable , but  we have different results with
H2SO4 stripping and HCL stripping . Both stripping solution are fresh and
the ammount of dissolved copper is even not visible . Which method is "
common practice " and why the results are different .
2 ) We are checking the quality of reducing process by 10% HCl for very long
time . Just now we are not sure about proper definition of " 10 % HCl " : it
is 10 % by volume of commercial HCl ( 35 % ) or 10 % by weight of pure HCl (
1: 3 dilution of commercial HCl ) . What is the common practice and expected
results ?
Best regards
Szpruch Edward
Eltek Ltd - Israel
Tel  972 3 9395050
Fax 972 3 9309581
E-mail :  [log in to unmask]

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