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Fasteners Coatings Review

Fasteners, bolts, screws and nuts are often treated or coated as required by environment or application, The coating is a covering that is applied to the surface of the fastener. In many cases coatings are applied to improve surface properties of the fastener, such as appearance, galvanic capatibility, corrosion resistance, wear resistance, gall resistance and scratch resistance.

Coating processes may involve the application of a thin film, conversion coating, plating of functional material to the fastener.

Coating processes applied to fasteners are classified as follows:

Chemical vapor deposition:

Metalorganic vapour phase epitaxy
Electrostatic spray assisted vapour deposition (ESAVD)
Physical vapor deposition
Cathodic arc deposition
Electron beam physical vapor deposition (EBPVD)
Ion plating
Ion beam assisted deposition (IBAD)
Magnetron sputtering
Pulsed laser deposition
Sputter deposition
Vacuum deposition
Vacuum evaporation, evaporation (deposition)
Chemical and electrochemical techniques
Conversion coating
Chromate conversion coating
Plasma electrolytic oxidation
Phosphate (coating)
Ion beam mixing
Pickled and oiled, a type of plate steel coating.
Electroless plating


High velocity oxygen fuel (HVOF)
Plasma spraying
Thermal spraying
Plasma transferred wire arc thermal spraying


Epitaxy (Vapor-phase, Liquid-phase)
Vitreous enamel
Enamel paint
Silicate mineral paint
Polymer coatings, such as Teflon
Powder coating or Powder slurry coating
Fusion bonded epoxy coating (FBE coating)
Molecular beam epitaxy
Spin coating
Paper coating
Industrial coating

Roll-to-roll coatings:

Air knife coating
Anilox coater
Curtain Coating
Single and Multilayer Slide Coating
Flexo coater
Gap Coating
Gravure coating
Hot Melt coating
Immersion (dip) coating
Knife-over-roll coating
Metering rod (Meyer bar) coating
Reverse Roll coating
Roller coater
Rotary screen
Silk Screen coater
Slot Die (Extrusion) coating

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