To improve the quality of the surface treatment of the large Assembling Shunt Capacitor

bring down the intensity of labour

and improve the working environment the experiments of coating the case with environmental friendly phosphating powder were carried out under the condition of limited working space. It is shown that an ideal film can be formed to get rid of grease and rust and have good phosphating and passivation effect. This film has good compatibility with insulating oil

and is corrosion resistant in the condition of natural ventilation. The adhesion between the film and the paint achieves first grade.