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Available Coatings of Sintered NdFeB Magnets

Surface	Coating	thickness(um)	Color	SST (h)	PCT(h)
Surface	Coating	thickness(um)	Color	SST (h)	PCT(h)
Nickel	Ni+Ni	10-20um	Bright Sliver	>24-72	>24-72
Nickel	Ni+Cu+Ni	10-20um	Bright Sliver	>24-72	>24-72
Black Nickel	Ni+Cu+Ni	10-20um	Bright black	>48-96	>48
Cr3+Zink	ZN	5-8um	Bright blue	>16-48
Cr3+Zink	C-Zn	5-8um	Shining color	>36-72
Sn	Ni+Cu+Ni+Sn	10-25um	Sliver	>36-72	>48
Au	Ni+Cu+Ni+Au	10-25um	Gold	>12	>48
Ag	Ni+Cu+Ni+Ag	10-25um	Sliver	>12	>48
Epoxy	Epoxy	10-20um	Black ,Grey	>48
	Ni+Cu+Epoxy	15-30um		>72-108
	Zn+Epoxy	15-25um		>72-108
passivation		1-3um	Dark,Grey	Temporary Protection
Phosphated		1-3um	Dark,Grey	Temporary Protection

Note：
1.Different plating.different SST Result.
Salt Spray Test Results,which is plated by Grinding (Small Size Magnets).is better than the one ,which is coated by Hanging up (Big size magnets)
2.Salt Spray Test(SST)test condition:5%NaCl,35℃ Continuously spray a certain time,test whether there is corrosion on coating surface.
3.Pressure Cooking Test(PCT)test condition:2 atm,95%RH(relative humidity).121℃to test the coating adhesion
Note:The products coating Zinc,passivated/phosphated ,or coating Epoxy are not suitable for PCT.
4.Other methods to test the coating quality:Drop test ,Cross Cut test ,Heating and Spilling test,constant temperature and humidity test etc.