Rotationskolbenmaschine, insbesondere Schraubenkompressor oder Schraubenvakuumpumpe

摘要

A method treating a surface of rotors in a screw-type rotary fluid machine, with the method comprising the steps of: conducting a non-electrolytic Ni plating on the surface of each rotor so as to form a first layer of non-electrolytic Ni plating layer; heating the rotor having the first layer at a temperature not lower than 500 DEG C.; and forming, at least, a second layer of an organic resin so as to cover the first layer.