Home /
T.O.C.
FAQs
 
Good
Books
Ref.
Libr.
Advertise
Here
Help
Wanted
Current
Q&A's
Search 🔍
the Site
pub Where the world gathers for
plating, anodizing, & finishing Q&As since 1989





-----

Electroless Nickel Deposit: Determining Phosphorus Content





September 11, 2012

Q. Hello All,

I've recently started working on a project looking at electroless nickel processes; currently only on the lab scale.

I'm plating sample boards with electroless nickel, stripping them with a nitric-acetic acid mix (thanks to this forum!) and then attempting to analyze the resulting solution using ICP. I have searched through the forum and haven't found the answer to my question.

The ISO standard for E-Nickel details quite a complicated method for using ICP to determine the phosphorous content- I want to keep costs low and don't want to purchase anything extra (if at all possible!) what I'm wondering though, is it possible to analyze the resultant solution (after stripping the deposit) as it is. Without adding any K permanganate etc?
I don't necessarily need a quantitative answer as to the concentration of phosphorous; but rather a % of P weight Ni.

What I'd ideally like to do, is strip my test board in approx. 100 ml of stripping solution; till all the deposit (EN on top of Cu) has been removed, and dilute the resultant solution back to 100 ml. Use ICP to determine Ni and P concentration, and then find the % of P with respect to Ni.

Is it possible to do it like this? I feel like I'm missing something fundamental and would appreciate any advice.

Many thanks!

Cambria Shones
- Leicester, UK



October 12, 2012

A. Dear Cambria,

I have a method to determine if your NiP layer on your part is amorphous or crystalline structure. Indeed, at 10.5% the alloy Ni and phos combines to become amorphous.

Use HNO3 solution (40 ml of water, 20 ml of HNO 65%) in a beaker.
If the layer becomes black after 1 min --> crystalline (< 10.5%)
if the plating stays grey ---> amorphous (> 10.5%)
Very cheap and very fast.
Don't strip your parts, do NiP plating and test directly.

Bye

Mai Xian
- Shanghai, China



"Standard Methods for Examination of Water & Wastewater"
by American Public Health Association
from Abe Books
(including dirt cheap older editions)
or

Affil. Link
Your purchases make finishing.com possible

October 12, 2012

You could always determine the phosphorus colorimetrically, using the single reagent ascorbic acid method. It's described in
<== 'Standard Methods ...'. You'd have to do a huge dilution of the stripping solution (standards or only linear up to 0.5 mg/l P) but as long as the dilutions are done carefully the answers should be accurate.

dave wichern
Dave Wichern
Consultant - The Bronx, New York



October 25, 2012

A. The simplest, fastest (and non destructive) way is by XRF using suitable standards if you have the equipment.
Otherwise analyse for nickel and calculate the phosphorus by difference.

geoff smith
Geoff Smith
Hampshire, England


none
finishing.com is made possible by ...
this text gets replaced with bannerText
spacer gets replaced with bannerImages

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories:

 
Jobshops
Capital
Equipment
Chemicals &
Consumables
Consult'g, Train'g
& Software


About/Contact    -    Privacy Policy    -    ©1995-2023 finishing.com, Pine Beach, New Jersey, USA