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Available Coating of Sintered Neodymium Magnets

by Stanford Magnets

Surface Coating Thickness(um) Color SST(Hours) PCT(Hours)
Nickel Ni+Ni 10-20 Bright Silver 24-72 24-72
Black Nickel Ni+Cu+Ni 10-20 Bright black 48-96 >48
Cr3+Zinc Zn 5-8 Bright Blue 16-48  Not Applicable
C-Zn Shining Color 36-72
Sn Ni+Cu+Ni+Sn 10-25 Silver 36-72 >48
Au Ni+Cu+Ni+Au 10-15 Gold >12 >48
Ag Ni+Cu+Ni+Ag 10-15 Silver >12 >48
Epoxy Epoxy 10-20 Black,Grey >48  Not Applicable
Ni+Cu+Epoxy 15-30 72-108
Zn+Epoxy 15-25 72-108
Passivation   1-3 Dark Grey Temporary Protection  Not Applicable
Phosphated   1-3 Dark Grey Temporary Protection  Not Applicable


•Salt Spray Test Result of Grinding coating is better than Hanging Up coating.

•SST test Condition: 5% NaCl, 35oC,Continuously spay for certain time

•Pressure Cooking Test (PCT) test condition: 2 atm, 95% RH (relative humidity), 121oC

•Other Testing Methods: Drop Test, Cross Cut Test, Heating and Spilling Test and Constant Temperature and Humidity Test, etc.

Neodymium Magnets Technical Sheet From Stanford Magnets.

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