▎ 摘　　要

NOVELTY - Inhibition of microbial corrosion of metal pipe involves mixing an antibacterial anticorrosive material and an epoxy resin, obtaining an anticorrosive coating, and applying resultant coating on surface of metal pipe. The antibacterial anticorrosive material is obtained by dispersing rare-earth-hybrid nano-silicon nitride sheet material in an aqueous solution of polyvinyl alcohol, mixing, adding graphene and aqueous ammonium dihydrogen phosphate solution, stirring, dispersing, adjusting pH of resultant system to 10.2-10.5 with aqueous ammonia solution, heating, stirring, aging, washing, oven-drying at 80-90 degrees C for 12-15 hours, grinding, obtaining rare-earth-hybrid nano-silicon nitride-graphene composite material, adding resultant to absolute ethanol, stirring, dispersing, adding urea and tetraethyl silicate, stirring, adding p-toluenesulfonic acid powder, introducing nitrogen, heating, stirring, washing, and oven-drying. USE - Inhibition of microbial corrosion of metal pipe. ADVANTAGE - The method enables economical and efficient inhibition of microbial corrosion of metal pipe. The anticorrosive coating effectively inhibits growth of microorganisms e.g. bacteria by interfering with formation of metabolite and life activities of microorganisms. The nanoparticles in the coating efficiently directly catalyzes the degradation of hydrogen sulfide gas produced by metabolism, thereby preventing occurrence of hydrogen evolution corrosion. DETAILED DESCRIPTION - Inhibition of microbial corrosion of metal pipe involves mixing an antibacterial anticorrosive material and an epoxy resin, obtaining an anticorrosive coating, and applying resultant coating on surface of metal pipe. The antibacterial anticorrosive material is obtained by mixing 14-15 g silicon nitride fine powder and 50-60 ml n-butanol aqueous solution, ultrasonically processing for 20-25 minutes, adding 1-1.2 g silane coupling agent, stirring for 30-40 minutes, adding 4.6-4.8 g cerium oxide powder to the mixture, stirring for 60-70 minutes, transferring resultant to a reactor, adding 4-5 ml poly(methyl methacrylate)-carbon tetrachloride mixture, sealing the reactor, pressurizing, reacting at 260-280 degrees C for 17-20 hours, naturally cooling to room temperature, washing resultant product with deionized water 3-4 times, drying in vacuum oven at 90-95 degrees C for 6-9 hours, pulverizing dried material, placing resultant in a crucible, placing the crucible in a muffle furnace, calcining for 110-120 minutes, obtaining dense rare-earth-hybrid nano-silicon nitride sheet material, dispersing resultant in 80-90 ml aqueous solution of polyvinyl alcohol, mixing at 1200-1300 rpm for 20-30 minutes, adding resultant to a round bottom flask, adding 1.1-1.2 g graphene and 25-30 ml aqueous ammonium dihydrogen phosphate solution, stirring, dispersing for 30-35 minutes, adjusting pH of resultant system to 10.2-10.5 with aqueous ammonia solution, heating to 74-78 degrees C, stirring for 1.3-1.5 hours, aging for 20-24 hours, washing resultant with deionized water and ethanol, respectively, oven-drying at 80-90 degrees C for 12-15 hours, grinding, obtaining rare-earth-hybrid nano-silicon nitride-graphene composite material, adding resultant to 90-100 ml absolute ethanol, stirring, dispersing for 30-40 minutes, adding 1.7-1.8 g urea and 1-1.2 ml tetraethyl silicate, stirring for 1.5-2 hours, adding 1.1-1.2 g p-toluenesulfonic acid powder, introducing nitrogen, heating to 102-105 degrees C, stirring for 2.5-3 hours, washing resultant with deionized water 4-6 times, and oven-drying at 80-90 degrees C for 8-10 hours.