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topic 5441

Electroless Nickel per AMS 2404?


Q. I am looking for information on Precipitation Hardening of Electroless Nickel per AMS2404 [link by ed. to spec at TechStreet]. I understand the theory of the process but need some practical information. First, is this something that the plater takes care of or does the plater generally sub-contract to a heat treater? Secondly, the optimum temperature and time for this post-plate procedure is generally 650 °F for two hours in a controlled atmosphere. Can one heat at 500-550 °F for 10-12 hours and achieve adequate results? Third, will the EN finish discolor at the 500-550 °F temperature in ambient atmospheres?

David Black
- Wrentham, Massachusetts


A. David,

You can heat treat your parts at 590 °F. for 3 hours and get the hardness you need 60Rc +. the part may come with light brown stains on them if not covered with fiber glass cloth. All platers should be able to do this heat treating in house.

Tom Mason
- Carol Stream, Illinois

Electroless Nickel Plating
Wolfgang Riedel
from Abe Books


April 2, 2009

Q. Dear sirs,
Is it ever possible to get to HRC 75 by EN plating? And how?
Thank you very much,

Frank Meng
- Huizhou, Guangdong, China

April 6, 2009

A. Hi, Frank. I don't think so. Please see letter 29781 for a good answer from Ron Duncan (dec.). Good luck.


Ted Mooney, Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey

Nickel Plating on AMS 5643 Material per AMS 2404

February 10, 2016

Q. What is the process of doing nickel plating per AMS2404 for the material AMS 5643?
I have read such plating will be of 3 types Low phosphorous, medium phosphor and high phosphor. Which process suits the material AMS5643 [link by ed. to spec at TechStreet] H1075 condition?

machine tools - Hyderabad, Telangana, India

February 2016

Electroless Plating
bt Mallory & Hajdu

from Abe Books
info on Amazon

A. Hi cousin Saritha. There are several good books which introduce electroless nickel plating. In addition to the three phosphorous contents of acid baths, EN-phosphorous can also be alkaline based,and there is a boron based electroless nickel too.

Generally the type of electroless nickel is not chosen based on the substrate material, but based on the needs of the surface. Solderability (boron best, low phosphorous good) and ferromagnetism (low phos), or freedom from it (high phos) can be criteria, but often the principal consideration is corrosion resistance (low phos is usually best for alkaline conditions, and high phos for acidic) or wear resistance/hardness (heat treated high phosphorous is best). It's not always easy to choose, but books like Mallory & Hajdu list dozens of automotive, aerospace, oil & gas, and electronics applications and what type of EN is usually chosen for them. Good luck.


pic of Ted Mooney
Ted Mooney, P.E. RET
Pine Beach, New Jersey
Striving to live "Aloha"

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