Coating process

A process for electroplating a selected surface area of a component with a crushable zinc alloy, the method comprising utilising a relatively low current density in an alkaline solution during the electroplating process to provide a crushable coating of said zinc alloy on said selected surface area wherein the component is a screw compressor component having a main axis and defining flutes, the component being mounted vertically in the solution and rotated about said axis at a sufficient speed such that the flutes in the component cause the solution to move up and down the flutes relative to the component.