Home /
Search 🔍
the Site

Chime right in! (no registration req'd)


"Electroless Nickel Thickness Vs. Salt Fog Resistance"


We are looking to plate steel parts with Mil-C-26074 [link is to free spec spec at Defense Logistics Agency, dla.mil] electroless nickel. Since the parts are steel, it is recommended that the Grade Coating be applied (0.0015-inch thick). We can only go up to 0.0008 inch, max. due to insertion requirements for the finished product. The question is: What kind of salt fog ( ASTM B117 [affil. link to spec at Techstreet] ) resistance can we expect to get from coating a steel part with 0.0008-inch of electroless nickel? Can we achieve 48-hours? 200-hours? What about for 0.0005-inch (Grade B)?

Are there graphs available plotting electroless nickel plating thickness versus salt fog resistance (hours)? Thanks for your help.

Marc Pepi
US Army Research Lab - APG, Maryland, USA


There are a lot of factors that effect the corrosion resistance,but the factors that have the greatest effect are surface roughness and%P of the EN. The lower the surface roughness the better the corrosion resistance. Also the higher the %P the better the corrosion resistance.

You should be able to get 48 hrs of salt spray from a high P EN deposit.

George Shahin
George Shahin
Atotech - Rock Hill, South Carolina


George is right, roughness, P content have a great effect on SS resistance but on top of that, heating which is done to improve hardness has also a great effect. For instance, 25 microns of high PEN should result in about 1000 hours in SS but if you heat it , the resistance will be reduced to about 100 hours.

sara michaeli
sara michaeli signature
Sara Michaeli
chemical process supplier - Tel-Aviv, Israel

finishing.com is made possible by ...
this text gets replaced with bannerText
spacer gets replaced with bannerImages

Q, A, or Comment on THIS thread SEARCH for Threads about ... My Topic Not Found: Start 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:

Chemicals &
Consult'g, Train'g
& Software

About/Contact    -    Privacy Policy    -    ©1995-2021 finishing.com, Pine Beach, New Jersey, USA