Electrostatic powder spraying process, which will be used in the valve industry, I believe many people know about valve. This technology can play a very good effect, but in the use process, there are also many things to note. Matters needing attention in electrostatic powder spraying appear below I will summarize domestic valve in the following:
A, pretreatment process. Methods after casting using sandblasting processing surface oxide skin and sand etc.. Try not to use blasting method. Because of the higher valve requirements of accuracy, especially inside the valve, there will be some local point shot blast cleaning is not to. Sandblasting can control the better surface roughness and smoothness. But its efficiency is relatively slow is its disadvantages. General requirements for the surface finish to achieve the Sa3 level, the surface roughness Ra value is 45~70um.
Two, after machining degreasing and phosphating must not be less. Surface into the powder room before if the local surface oil, first is oily coating thinner. The second is the coating adhesion, easy off. Finally is the coating color obviously.
Three, valve castings generally more thick, requires preheating time enough. This generally easy to overlook. Must be reasonable in the integral design scheme of powder spraying line, ensure that the valve is preheated in the oven operation have enough time.
Four, for large outdoor valve, which requires heavy anti-corrosion, selection of thermosetting powder on not to yield to the temptation of cheap used indoor powder, should use the pure epoxy resin powder, and asked manufacturers inspection report issued by the authority. In the same way indoor coating, powder coating if used outdoors, the service life of coating under normal circumstances 6 months. While the use of heavy-duty powder can reach more than 3 years.
The electrostatic spraying process is the market is the valve common treatment of nodular cast iron material, this year also in the surface treatment of the valve has been widely spread, but due to the electrostatic powder coating equipment manufacturing without careful analysis of different materials and the processing technology, because the materials and processing technology of different requirements of different characteristics in the electrostatic dusting equipment selection. It is not only the comprehensive performance of electrostatic dusting equipment, requirements of environmental protection requirements, recovery rate of powder, powder and other conventional optimization rate, more attention should be different types of workpiece processing needs its own development of the industry and market conditions required by the painting.
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