Recently close to Hangzhou Bay Bridge , the world's first offshore Longbridge this corrosion is very important , where the steel pipe pile corrosion program of particular concern. According to the China Association of epoxy resin industry experts, the Hangzhou Bay Bridge as a whole person in Haikou Hangzhou Bay , the environment is very harsh , steel pipe piles and various steel body bridge facing serious threat of corrosion , so the bridge corrosion protection and durability the problem is critical. Corrosion sector by constantly exploring new materials , new coating , in the famous " West-East " pipeline project experience in guiding , after repeated discussions expert identified as: heavy-duty epoxy powder as the underlying structure of the three anti-corrosion , from the current situation is correct and science , and has initially reflect the good results. According to the Hangzhou Bay Bridge geographical location and environmental conditions , anti-corrosion steel pipe pile program: changes in water level and the water district area epoxy powder coating + the piles filled with concrete ways .

Range of approximately 8m steel pipe pile cap using the following three- reinforced epoxy powder coating ( coating thickness ≥ 800 microns ) , cap the following range of about 42 meters with double epoxy powder coating ( coating thickness ≥ 600 microns ) , area under the steel pipe piles of mud using single epoxy powder coating ( coating thickness ≥ 300 microns ) coating the outer surface has a roughness of 30 to 100 microns . By the same steel piles as needed continuous spraying different layers , different properties of the coating of advanced technology, so that the entire steel pipe piles with anti- seawater corrosion, sediment erosion, sea biofouling resistant , anti-ultraviolet radiation , etc., while ensuring that the overall economy. Heavy-duty fusion bonded epoxy powder coating superior characteristics reflected in where? China Epoxy Resin Industry Association, experts say , the Hangzhou Bay Bridge Project antiseptic powder coating steel pipe piles classification , the first heavy-duty single grain of sand epoxy powder coating , its features include : a strong adhesion and good flexibility, resistance to bending ; without primer , easy coating, rapid curing , high efficiency , suitable for flow ; tough wear-resistant coatings , impact .

Meanwhile , resistance to stress and reduce transport and soil damage during backfill ; able to play a protective role in a wide temperature range and has a long lasting antiseptic effect ; has excellent resistance to cathodic stripping ability and chemical stability , water , oil, acid , alkali and salt ; single grain of sand to increase steel pipe pile after pile sinking kick resistance . It is the area of use of the mud region ( approximately 21 to 38 m ) of single-layer steel pipe pile epoxy powder coating ( coating thickness ≥ 300 microns ) , the coating having an outer surface roughness of 30 to 100 microns . Bridge double epoxy powder coating the coating has the following characteristics : a double- epoxy powder coating system outer coating , applied directly to provide corrosion protection in a single layer ( bottom ) on the bottom of the product 's design will in the transport and pipeline laying process to maximize the mechanical protection , and has good corrosion resistance ; excellent wear resistance, erosion , impact resistance , and thus has good protection, can effectively prevent the steel in the process of transportation and piling the collision damage and abrasions ; interleaved with the underlying outer coating process , i.e. the bottom of the electrostatic spraying after the design requirements for the overcoat . China Epoxy Resin Industry Association, experts say , when the straight -line shaped production line coating operations should be at the bottom of the pre- coated outer plastic coating .

Underlying coating temperature must be greater than 230 ℃ to ensure that its interlayer adhesion. Curing conditions were 230 ℃ / (1.5 ~ 3) min, gel time (GB / T 6554-2003): the outer layer 230 ℃, 8 ~ 12s; bottom 230 ℃, 30 ~ 45s. Cap for the following range of about 42 meters , with double epoxy powder coating ( coating thickness ≥ 600 microns ) . Three epoxy powder paint coating is top coat . China Epoxy Resin Industry Association (www.epoxy-e.cn) expert describes its characteristics : First, in addition to a single, double epoxy powder paint coating characteristics, have to withstand atmospheric H2S, CO2, O2, chemical acid, alkali , salt, organic matter and other substances corrosion ; Second, the three outermost coating has excellent weather resistance, ultraviolet radiation not powder ; Third, the outermost layer of the coating having three overcoatability . It is used for steel pipe pile cap the following range of about 8 meters , with enhanced three- epoxy powder coating ( coating thickness ≥ 800 microns ) . This is currently more advanced protective coatings, namely single, double and triple heavy-duty anti-corrosion epoxy powder coating structure combine to maximize the protection of Hangzhou Bay Bridge steel pipe pile , steel pipe pile corrosion resistance ease .