NingBo BeiLun Meank Magnetics Co., Ltd
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Technical Help

1. Available coatings for neodymium magnets

Surface

Coating

Thickness (Microns)

Color

Resistance

Passivation


1

Silver Grey

Temporary Protection

Nickel

Ni+Ni

10-20

Bright Silver

Excellent Against Humidity

Ni+Cu+Ni

Zinc

Zn

8-20

Bright Blue

Good Against Salt Spray

C-Zn

Shinny Color

Excellent Against Salt Spray

Tin

Ni+Cu+Sn

15-20

Silver

Superior Against Humidity

Silver

Ni+Cu+Ag

10-20

Silver

Superior Against Humidity

Gold

Ni+Cu+Au

10-20

Gold

Superior Against Humidity

Copper

Ni+Cu

10-20

Gold

Temporary Protection

Epoxy

Epoxy

15-25

Black,Red,Grey

Excellent Against Humidity&Salt Spray

Ni+Cu+Epoxy

Zn+Epoxy

Parylene

Parylene

5-20

Grey

Excellent Against Humidity,Salt Spray,Superior Against Solvents,Gases, Fungi and Bacteria,FDA Approved

Chemical

Ni

10-20

Silver Grey

Excellent Against Humidity



2. Physical properties of rare earth neodymium magnets

Parameter

International Unit

Standard Data

Curie Temperature(Tc)

310-380

Maximum Operating Temperature(Tw)

80-230

Hardness

Hv

620

Electrical Resistivity (ᵨ)

Ω.cm

1.8x10⁻⁴  ~2.0x10⁻⁴

Density(D)

g/m³

7.45~-7.65

Recoil Permeability(µ rec)


1.05

Magnetization Field Strength(Hs)

kA/m

≧2400

kOe

≧30

Bending Strength

Mpa

295-345

Temp. Coefficient of Br

%℃

-0.11~-0.12

Temp.Coefficient of Hcj

%℃

-0.5~-0.7


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