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Letter 21096
SN/PB PLATING PEEL OFF FROM NICKEL SUBSTATE
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MY BASE MATERIAL IS NICKEL PLATED AND IT GOES TO OTHER PRODUCTION
PROCESSES, AND THEN IT WILL BE ELECTROPLATED WITH SN/PB 90% THE
RESULT IS THE SN/PB COATING PEEL OFF OR AREAS OF NICKEL IS EXPOSED.
QUESTION.
1.HOW TO PRETREATMENT THE NICKEL TO IMPROVE SN/PB PLATING
2.HOW TO ACTIVATE THE NICKEL
3.HOW TO CHECK THE PROBLEM
B.S. Roxas
- Manila, Laguna, Philippines
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Please give more details about the nickel; for example, is it
bright nickel or a simple watts type bath? This will greatly
influnece any treatments. You must also supply details of your
current pretreatment and the type of Pb/Sn bath you use. the more
details you supply, the better the answers will be - I do not know
anyone who can read the minds of others, especially over the
Internet.
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Trevor Crichton
R&D practical scientist - UK
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Assuming the Tin/Lead plating bath is the old fashion fluoborate
formulation, then: (1) Clean the old nickel CATHODICALLY in a steel
electrocleaner formulation at about 12 oz/gal, 50 amps/sq ft, (2)
Make the part cathodic in 50% Fluoboric Acid using bagged carbon
anodes, do not rinse (30 enter "hot" into the tin/lead plating
solution. To test: hammer, tape, bend, scrape, etc...
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