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"Failure testing of nickel plating"



1998

I would like to test the integrity of a nickel plating (IAW Mil-C-26074 [link is to free spec spec at Defense Logistics Agency, dla.mil]E CLASS 2, .0015 MIN THICKNESS) on a part. Please tell me what the MOST harmful environment is for the plating. I need to know what will cause the plating to flake off, wear down, or be destroyed in some other way.

Vince Vendetti
Naval Surface Warfare Center - Dahlgren VA
^


Flaking off occurs as the result of poor adhesion from improper surface preparation; this is probably best tested with a thermal stress cycle, most importantly, just heating the item to a substantial temperature. Wear can be tested with a Taber Abrasion tester.

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
^


1998

Vinc,

Ted's suggestions are sound- and since MIL-C-26074 has been discontinued and the suggested replacement (AMS2404 [affil. link to spec at Techstreet]) is really intended for the automotive industry and is less demanding in terms of physical requirements, you must choose your testing based on the intended service conditions. We employ a bend test of coupons using a 1/2" mandril. Also, since our parts are subsequently soldered in a vapor phase, we subject the parts (100%) to a vapor phase test (the thermal shock Ted mentioned) to check for blistering. In lieu of Taber abrasion resistance, you could also consider a microhardness test. For corrosive environments, think about CASS or salt spray testing as well.

Good luck.
Keith

Keith Wicklund, CEF-SE
avionics - Minneapolis, Minnesota
^

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