What coatings are available for magnets?

There are various coatings that can be used on magnets to protect them from external influences or improve their performance. Here are some common coatings for magnets and their advantages and disadvantages:

Nickel (Ni-Cu-Ni) coating:

Advantages: Protection against corrosion, good adhesion to the magnet, relatively inexpensive, good price-performance ratio
Disadvantages: Susceptible to flaking under mechanical stress

Chrome (Cr) coating:

Advantages: Excellent corrosion protection, high hardness and abrasion resistance, good adhesion to the magnet.
Disadvantages: Higher cost compared to some other coatings

Zinc (Zn) coating:

Advantages: Inexpensive.
Disadvantages: More susceptible to corrosion than nickel (better corrosion resistance is achieved with Ni-Cu-Ni-Zn, for example). Ni-Cu-Ni-Zn), can leave black residues

Gold (Ni-Cu-Ni-Au) coating:

Advantages: beautiful appearance (for decorative purposes)
Disadvantages: Higher cost, only suitable for decorative purposes as the gold plating can be rubbed off with frequent use

Cube magnet 5.0 x 5.0 x 5.0 mm neodymium N45 gold-plated - holds 1.6 kg

Block magnet 10.0 x 10.0 x 2.0 mm neodymium N45 gold-plated - holds 1.2 kg

Cube magnet 10.0 x 10.0 x 10.0 mm neodymium N45 gold - holds 7.3 kg

Epoxy resin coating (Ni-Cu-Ni-Epoxy):

Colour: Black
Advantages: 100% corrosion-resistant, provided coating is intact
Disadvantages: Not impact-resistant (can crumble)

Teflon (PTFE) coating:

Colour: Grey/anthracite
Advantages: excellent chemical resistance, low friction, good non-stick properties, almost waterproof, very abrasion resistant
Disadvantages: higher cost compared to some other coatings.

Disc magnet Ø 20.0 x 5.0 mm Teflon N45 - holds 6.8 kg

Disc magnet Ø 10.0 x 5.0 mm neodymium N45 Teflon - holds 3.2 kg

Block magnet 30.0 x 10.0 x 5.0 mm neodymium N45 TEFLON - holds 7.0 kg