Define the exposure
Specify the coating formulation, thickness on each face, edge coverage, substrate preparation and cure. Agree a corrosion test method, exposure duration and acceptance endpoint for the actual part, then request its report. Salt-spray hours are not a service-life guarantee.
NiCuNi
Nickel-copper-nickel is a layered metal coating. Nickel is ferromagnetic. Assess the specified thickness and layer stack in the actual circuit, and qualify the intended adhesive on that surface.
Epoxy and zinc
Confirm formulation, underlayers, thickness, cure or passivation and edge coverage. Neither coating name establishes standard salt-spray hours, temperature performance or a price ranking.
Specialised coatings
Parylene, PTFE and other formulations require application-specific evidence. A material name alone does not establish food-contact compliance, finished-device biocompatibility, MR compatibility, sterilisation resistance or vacuum suitability. The FDA’s September 2023 guidance addresses biological evaluation of the finished device.
Agree the reports
Set qualification and lot-inspection requirements for the actual part and route. Request the test method, duration, acceptance endpoint and results. Conflicting generic salt-spray tables should not be used as a product guarantee.
Send the environment, drawing and acceptance criteria for a coating review.
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