TECHNET Archives

September 2000

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Jonathan A Noquil <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 21 Sep 2000 09:16:42 +0800
Content-Type:
text/plain
Parts/Attachments:
text/plain (54 lines)
You have a bad pre-cleaning line.
Your soft-etching or micro-etching does'nt thoroughly remove
some oxides on your copper. Thick oxides are difficult to remove
esp those boards after soldermask cure.
Try to check your copper surface condition.
Etching rate during acid etching.
Apperance of gold and Ni only adopts the condition of the underlying metal
such as copper.

hope this helps





"Scott B. Westheimer" <[log in to unmask]>@IPC.ORG> on 09/21/2000
08:41:50 AM

Please respond to "\"TechNet E-Mail Forum.\" <[log in to unmask]>, \"Scott B.
      Westheimer\"" <[log in to unmask]>

Sent by:  TechNet <[log in to unmask]>


To:   [log in to unmask]
cc:
Subject:  [TN] ENIG



I was wondering if those of with experience running ENIG line  could help
me with some issues we are encountering. What is the reasons for
discoloration of gold? We have tried rinsing in hot DI, drying immediately
after  coming out of the gold solution as to not allow water to dry on the
surface, but  we still encounter small amounts of tarnish or discoloration.
This is new for us  and your help would be appreciated.

Scott B. Westheimer


##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8d
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
the body:
To subscribe:   SUBSCRIBE TECHNET <your full name>
To unsubscribe:   SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Keach Sasamori at [log in to unmask] or
847-509-9700 ext.5315
##############################################################

ATOM RSS1 RSS2