Barrel Electro Coatings

fasteners nuts and bolts zinc plated and passivated 

electroplate coatings 

barrel electroplating of fasteners

Zinc plated fasteners

Zinc plated fasteners are coated by the barrel electroplating process. This process creates a surface covering in which Zinc or another metal is deposited on a conductive steel surface. Electroplating is an old process and has been around for hundreds of years; it is critical for modern technology.


Barrel electroplating involves a chemical solution with the ionic form of the metal, an anode (positively charged) which may consist of the metal being plated or an insoluble anode and finally, a cathode (negatively charged) where electrons are supplied to produce a film of non-ionic metal.


Fastener Coating Benefits

Plating of fasteners is primarily for corrosion inhibition, also to improve the ability for the fastener to be:

  • Soldered
  • Surface hardened
  • Improve wear life
  • Reduce friction
  • Improve paint adhesion
  • Alter conductivity
  • Give a decorative finish.



In addition to the Zinc protection against corrosion, a post-plating dip is applied to the zinc coating which is called a passivate or conversion coating.This additional process leaves a thin chromate film which screens the zinc from oxidizing.


The effectiveness of this two-layer system determines the overall corrosion performance of the coating.



zinc plated fasteners




zinc electroplated fasteners