8% rings a bell... too low you got problem with magnetic properties issues, too high you got stress issues or mechanical properties issues... it just starting point... many other effect also play a role on the concentration... (morphology, surface oxidation, etc.etc.). IMHO. jk On Jan 29, 2018, at 11:20 AM, Stadem, Richard D wrote: > Per IPC-4552 which defines ENIG plating which is what I assume you > are talking about, and not ENEPIG, the phosphorus and boron content > is mentioned in section 1.2.1 and within Table 3-1 it references > ASTM-B-733-97 and ASTM B607-91. It depends on the plating company > and the specific ENIG plating product; no specific value is given > other than it should be controlled within the specific process > limit, which is (usually) a function of the plating product > (Technical Data Sheet) used. No testing is required. The desired > range from the many papers I have read always point to an "ideal > range" of 7 to 10% P, but that may have changed in the past two or > three years. > Many factors other than the P-level are just as or more important, > however. For example, if the gold thickness is too high it can also > result in an attack on the nickel which results in a change in the > P-level. If the nickel bath is less than 4% P, the general > consensus is for sure it is much too acidic and will result in > problems. But it all depends.....Kachink. > But whatever it is for the specific product and process used, all > of the standards, documents, and papers written on the subject say > the same thing; the ideal process parameters are required to be > precisely identified, documented, and carefully controlled and > monitored. If the plating company does not have real-time > monitoring and datalogging equipment in place and being used, don't > use that vendor. > dean > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Frank Kimmey > Sent: Monday, January 29, 2018 9:45 AM > To: [log in to unmask] > Subject: [TN] Phosphorus content in Electroless Nickel > > Hey FAB Guys (or Chemical types or anyone else who might help), > What should the P content in the Electroless Nickel bath be? > I am concerned some of our suppliers are running to high. > This could be the cause of some Brittle Fracture failures I have > been seeing. > What would you consider a good range for Phosphorus percentage in > the Electroless Nickel bath? > Thanks, > FNK > > Frank N Kimmey CID+ > Electrical Engineer / PCB Design > VeriFone Inc > 1400 W Stanford Ranch Road, Suite 200 > Rocklin, CA 95765 USA > W: 1-916-625-1818 > M: 1-916-833-9877 > [log in to unmask] > > ********************************************************* > This electronic message and any attachments are intended only for > the use of the addressee. The information in this electronic > message is confidential and proprietary, and may include privileged > information. If you are not the intended recipient, please delete > this electronic message and any attachments and notify the sender > of the error. Please be aware that any unauthorized use, > dissemination, distribution or copying of this message or any > attachments is strictly prohibited.