To : Raschetty
  From : HHTong
  Date : 311097

   Currently I am trying to evaluate Lea Ronal Actronal for acid descaler
for alloy42 .
   Any comments . I am quite a bit worried due to the sulphuric acid based
.Furthermore
   we have a short length of the line exposed to air which I believe could
contribute
   to the yellowish brown smut and causing adhesion problem .Please reply asap.




At 02:18 PM 10/30/97 UT, you wrote:
>        With regard to the inquiry on Alloy 42 pre-treatment below, most
companies
>who are plating this base material today use proprietary cleaning/descaling
>processes which have been designed for specific lead frame alloys, Alloy 42
>included.  These processes are available from a number of suppliers, LeaRonal
>included, but  as Technet is not a commercial forum, I will not go into the
>specifics of our process. In general, all of these types of pre-treatment
>processes contain one or more oxidizing agents, acid (usually sulfuric), and
>possibly other compounds such as inhibitors or mild chelating agents.  Finding
>the right combination of ingredients to properly pre-treat the material
>without causing problems in the plating process is what the specialty chemical
>suppliers are supposed to do.
>
>        If you've not had success with other products and if you desire more
>information you can contact me off-line.
>
>        Rob Schetty
>        LeaRonal Inc.
>(T)  516-868-8800
>(F)  516-867-5917
>
>----------
>From:  TechNet on behalf of tonghh
>Sent:  Thursday, October 30, 1997 7:22 AM
>To:  [log in to unmask]
>Subject:  [TN] Alloy42
>
>    Hello to all technetters :
>
>    Recently I have been trying to figure out the best pretreatment method for
>    alloy42 materials for further plating processes .Could someone share some
>    info on this , since alloy42 materials is very sensitive  in nature . We
>    have tried using 5% sulphuric acid and others proprietary chemicals also
>    sulphuric acid based , the operating window is limited .
>
>    Thanks .
>
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