This paper introduced a kind of corrosive liquid,and equipment—steel-plastic-ceramic composite submersible pump with the properties of anti-corrosion and wear-resistance,which can convey wearing medium containing ash.It was made by depositing nano ceramics enhancing plastic coating's ability of anti-corrosion and wear-resistance in flow surface between pump body and pump cover,and by depositing anti-corrosive plastic coating in pump body and the outer surface of motor shell.Impeller,on the whole,was made by stainless steel metal ceramic,and sealing ring was manufactured by toughened ceramics.Pump spindle was the stainless steel segment as the head of flow welding,docking to the carbon steel by friction welding.The organic bond among steel,plastic and ceramic give full play to the performance of high strength of metal structure,strong anti-corrosion of special plastic and strong wear-resisting of ceramic,which achieve anticorrosive and wear-resistant function the submersible pump need in the most cost-effective way.It is suitable for the pump removing sulfide and cleaning dust for thermal power plant's fire coal,and is applicable to the pump conveying a liquid containing acid,alkali,salt and ash in high sulfur coalmine,washing smelter,coking plant,paper factory,oil plant,chemical plant,fertilizer plant,pharmaceutical factory,sewage treatment plant.

A type of conveying equipment--steel-plastic-ceramic composite submersible pump with good corrosion- and wear-resistance in corrosive liquid and wearing medium containing ash is introduced. On the flow-passing surface of pump body, pump cover and big impeller, a plastic coating with nano ceramics enhancing plastic coating＇s corrosion and wear resistance was deposited. The small impeller was made by stainless steel metal ceramic and sealing ring was manufactured by toughened ceramics. The pump spindle was the stainless steel or titanium alloy segment connected to carbon steel by friction welding. Due to the organic bonding among steel, plastic and ceramic, the pump had the performance of high strength of metal structure, strong anti-corrosion of special plastic and strong wear resistance of ceramic. Thus, the pump achieved good corrosive and wear resistant function by the most cost-effective way. The pump is suitable for removing sulfide and cleaning dust for thermal power plant＇s fire coal, and is applicable to convey a liquid containing acid, alkali, salt and ash in the high sulfur coal mine, washing smelter, coking plant, paper factory, oil plant, chemical plant, fertilizer plant, pharmaceutical factory, sewage treatment plant.

The structural principle, technical index and test method of a test machine that simulates dynamic corrosion of pumps and pipes in chemical engineering are described. It is mainly used to examine the dynamic corrosion property and endurance, especially can be used as a test base for development of new type pumps and pipes with plastic cladding. The test machine with new design and good structure has been proved to be stable in property, easy to operate, economical and efficient. It can provide reliable test results.