Bret: Electroless Ni and electroplated Ni are two totally different animals.
Get a copy of the annual Metal Finishing Guidebook and Directory. Go to the
section on nickel plating.
It will help answer your questions. You may also want to contact suppliers
of Ni plating chemistry they can provide you with additional information on
this subject. There are probably literally millions of papers on nickel
plating, try your favorite search engine.
Low stress electroplated nickel is usually around 0 - 50 MPa. It is
controlled by bath composition and operating conditions.
Regards
Michael Barmuta
Fluke Corp.
-----Original Message-----
From: Adair, Bret [mailto:[log in to unmask]]
Sent: Wednesday, February 12, 2003 8:31 AM
To: [log in to unmask]
Subject: Re: [TN] electroless vs. low stress NI
Your question addresses the root of my dilemma. Short answer is that I do
not even know what low stress is or why it is necessary.
The reasons given to use electroless NI over electrolytic NI is that it has
"superior throwing power, the deposit is less porous and the process does
not require power supplies, electric contacts, bus bars or electrical
measuring devices."
- George Milad Atotech USA Inc. Rock Hill, SC. (found within SMC-WP-005,
April 1997)
The above is the closest I have found regarding the reasons electroless NI
is used for finishing. With ENIG being such a popular surface finish, I
expected to be able to find numerous white papers as to how and why it is a
preferred finish.
The catalyst for my question is that we have a standard notes for each
surface finish. When one of our legacy boards required a modification, I
was asked to update the notes to our new standard. It originally called out
low stress nickel followed by hard gold. Our current standard states low
stress nickel followed by hard gold. When the vendor received this
revision, they barked at this change as they do not have electroless
capabilities. They the asked if they could use their low stress
electrolytic process. Being that it is the only house that has produced
this board, and had been using this process, I accepted it. I still want to
understand the reasoning though. If anyone out there has found white papers
web pages or napkins which sheds more light I would like to see them.
Bret
BM__MailData-----Original Message-----
From: Sencer Sofuoglu [ mailto:[log in to unmask]
<mailto:[log in to unmask]> ]
Sent: Wednesday, February 12, 2003 8:27 AM
To: [log in to unmask]
Subject: Re: [TN] electroless vs. low stress NI
According to paper in the Modern Electroplating book a typical
Sulfamate
bath has 500psi stress while Watts bath has 18,000psi stress. Increasing
chloride concentration of Sulfamate bath increase stress to 1500psi. Is this
number too high to be low stress. Is there a range?
Regards,
Sofu
-----Original Message-----
From: Barmuta, Mike [ mailto:[log in to unmask]
<mailto:[log in to unmask]> ]
Sent: Tuesday, February 11, 2003 9:13 AM
To: [log in to unmask]
Subject: Re: [TN] electroless vs. low stress NI
Bret: One word of caution. Simply calling out electrolytic Ni does
not
assure you of low stress nickel. All electrolytic Ni is not stress free.
Typically a low stress Ni electroplate is produced with a sulfamate Ni bath
and low brightners/organics. Make sure you call it out correctly
Regards
Michael Barmuta
Staff Engineer
Fluke Corp.
Everett WA
425-446-6076
-----Original Message-----
From: Adair, Bret [ mailto:[log in to unmask]
<mailto:[log in to unmask]> ]
Sent: Monday, February 10, 2003 3:29 PM
To: [log in to unmask]
Subject: Re: [TN] electroless vs. low stress NI
I guess the differentiation between the two should have been
electrolytic or
electroless Ni. Thanks for the help.
Bret
-----Original Message-----
From: Crepeau, Phil [ mailto:[log in to unmask]
<mailto:[log in to unmask]> ]
Sent: Monday, February 10, 2003 3:52 PM
To: [log in to unmask]
Subject: Re: [TN] electroless vs. low stress NI
hi,
for one, low stress nickel plating is associated with
electro-deposited
nickel. the bath and plating process are formulated to electrodeposit
nickel with low stresses (no duh, huh?). for all i know, electroless nickel
deposits may have low stress also due to the fact that there ain't much
there, but it isn't referred to as 'low stress' nickel.
phil
-----Original Message-----
From: Adair, Bret [ mailto:[log in to unmask]
<mailto:[log in to unmask]> ]
Sent: Monday, February 10, 2003 9:29 AM
To: [log in to unmask]
Subject: [TN] electroless vs. low stress NI
We have some prints here which call out low stress nickel followed
by gold
and some call out electroless nickel followed by gold. What is the
difference between electroless and low stress nickel?
Bret
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