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Magnets Coating /Plating
Magnets Coating /Plating
Sep 2, 2008 1:38:16 PM
Magnets Coating /Plating
Available Coatings Of Sintered NdFeB Magnets
Surface Coating Thickness(Microns) of coating Color Resistance Salt spray Test Standard     (hours) Pressure Coating Test Standard (hours)
Passivation 　 1--2um Silver Grey Temporary Protection Not available Not available
Nickel Ni+Ni  10--20um Bright Silver Excellent against Humidity 24 24
Ni+Cu+Ni
Zinc ZN 3--8um Bright Blue Good Against Salt Spray 24 Not available
C-Zn shiningColor Excellent Against Salt Spray 48 Not available
 CR3+Zinc ZN 3--8um Bright Blue Good Against Salt Spray 24 Not available
C-Zn shining Color Excellent Against salt Spray 48 Not available
Tin Ni+Cu+Sn  10-25um Silver Superior Against Humidity 48 Not available
Gold Ni+Cu+Au 2--10um Gold Superior Sgainst Humidity Not available Not available
Ag Ni+Ag 2--10um Silver Superior Against Humidity Not available Not available
Epoxy Epoxy 10-25um Black,Grey Excellent Against Humidity & Salt Spray 48 Not available
Ni+Cu+Epoxy Not available
Zn+Epoxy Not available
Coating Test Standard of Nickel coating
(1).Salt Spray Test(SST):
Test condition :
Temperature:35C Degree,5% NaCl ,Continous spray for 24 hours.
Test Standard/Criterion:
Coating is good ,doesn’t get off,no bubbles,no dots.no rust appear.
(2)Pressure cooker Test (PCT):
Test condition : 
121C and 95% RH and 2 atmosheric pressure, test for 24 hours  
Test Standard/Criterion:
Coating does not Get off, there are no air bubbles or dots Appear
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