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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