The basic components of the enamel :
The enamel is glass frit and additives will together crushing mixed glaze, coating and coating formed on the metal surface and burn.
Surface cleaning of enamel substrate :
Metal bodies must be alkali washed, washed, washed, washed, washed and cleaned before the enamel. Pump castings generally used shot blasting, sand blasting, low temperature drying.
Enamel coating and enamel firing :
1. The main methods of coating enamel has a variety of manual enamelling, spraying, dipping, coating, electrophoresis for electrostatic spraying. According to the quantity of products, quality requirements, raw materials, productivity and other reasonable choice of coating method.
2. Enamel firing according to different products to choose the appropriate temperature and time. Pump casting porcelain enamel firing process is generally: 300 degrees Celsius into the furnace, heating 550 to 820 degrees Celsius, power off furnace cooling.
Performance requirements for Castings :
The casting of enamel should have good fluidity, the structure must be compact, the graphite is small, no pores, cracks and other defects. The mechanical properties and chemical composition of the following table shall be in accordance with the provisions of the following table:
Effect of enamel on pump performance :
Enamel coating with its outstanding characteristics of the glass and good physical and mechanical properties, so it is widely used in the pump industry.
1. Application of enamel technology to cast iron pump have excellent corrosion resistance to chemical medium, capable of a variety of organic and inorganic acid, weak acid and organic solvent, and oil resistant, non-toxic, no pollution, no hanging material and electrical insulation and other advantages, greatly enlarges the application field of cast iron pump.
2. The application of enamel technology makes the pump flow components more smooth, thereby reducing the friction loss of the liquid flow, improve the efficiency of the pump, the practice has proved that the efficiency can be improved by about 5%, energy saving is significant.
