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NdFeB magnets can corrode when their surface is exposed to moisture or a demanding environment. Coating selection should account for the base material, part geometry, exposure conditions, dimensional allowance and inspection method. Ni-Cu-Ni, zinc, epoxy and gold finishes are options to compare; the finish available for a specific part is confirmed during quotation.
There is no universal salt-spray-hour rating for a coating name. Results depend on the plating stack, thickness, part geometry, test method and pass criteria. Include the required coating thickness, exposure test method, acceptance criteria and operating temperature in your RFQ so the proposed finish and inspection scope can be reviewed for your part.
Coating selection starts with the environment and the finished dimensions in the drawing. These are options to review, not interchangeable corrosion ratings:
A coating does not set the magnetic operating-temperature limit of an NdFeB part. That depends on the grade, geometry, working point and magnetic circuit. For chemical exposure, sterilization, food contact or medical use, provide the applicable acceptance and validation requirements. A coating name alone does not establish suitability.
For a coating review, send the drawing, operating environment, continuous and peak temperature, allowed coating thickness, quantity and the test method with pass criteria. The quotation can then identify a proposed finish and its inspection scope.
For the full part specification, see our custom neodymium magnets page. In your inquiry, include the drawing, exposure conditions and coating inspection requirements so the finish can be reviewed alongside the grade.
Share your drawing, magnetic requirements and operating conditions. Magnetstek reviews grade, coating, magnetization and inspection options for each custom part.