硫酸中常用材料的耐腐蚀曲线图.ppt
Sulphuric acid,对冷却水中氯离子的耐腐蚀曲线,10,102,103,104,105,0,50,100,Temperature °C,No corrosion,316,C-276,254 SMO,Crevice corrosion,D-205,pH = min 7.0,ppm chlorides,Sulphuric acid,Typical Composition of Metals for Use in Heat Exchangers in H2SO4 Processing,N 0.2 W W 3, Fe 2-6 W 2.5, Fe 18-21 Si 5, Fe 6 Si max.0.08,AISI 316 Avesta 254 SMO Alloy C-276 Hastelloy C-22 Hastelloy G-30 Hastelloy D-205 Hastelloy C-2000,17.0 20.0 15.5 21.0 29.5 20.0 23.0,12.0 18.0 58.0 44.0 40.0 64.5 59.0,2.0 6.1 16.0 13.5 5.0 2.5 16.0,0.7 1.7 2.0 1.6,Others,Cr,Nickel,Mo,Cu,Composition,Sulphuric acid,Iso-corrosion diagram 0.1 mm/year,Diabon,Hastelloy D-205,254 SMO,Hastelloy C-276,Alloy G-30,AISI 316,AISI 316,150,100,50,0,°C,150,100,50,0,°C,硫酸中常用材料的耐腐蚀曲线图,Sulphuric acid,硫酸板式换热器使用材料： 稀酸：镍合金SMO254:浓度10以下，温度75以下，Cl根3000ppm 氟离子 1000ppm以下; 浓酸：哈氏合金C276：浓度93以上，温度90以下 密封垫片：稀酸三元乙丙橡胶EPCM，浓酸氟橡胶FKMG，半焊接式换 热器板片密封可不用氟橡胶 铜电解液换热器使用材料：在介质浓度不变的条件下，影响腐蚀的二大因素是温度和接口流速； 硫酸下使用的材料：SMO254和哈市合金G30（比C276耐Cl根和氟根优越） Ti：在硫酸铜介质中，可到105 接口流速对板片腐蚀的影响：通常金属表面形成的氧化膜抵抗介质的腐蚀， 大多数氧化膜对流速是敏感的； 板式换热器中，通道流速，分流区和接口流速中，接口流速最快，当电解液循环流量超过设计流量时，接口流速增加,Sulphuric acid,Plate - main components,Thin sheet design, cold formed in single step hydraulic pressing (up to 40000 tons),Main heat transfer area,Distribution area,Suspension,Inlet / outlet,Passing through,Gasket in gasket groove,Leak chamber,Sulphuric acid,Unique 5-point alignment system Provides exact positioning of the plates horizontally and vertically Ensures good sealing throughout the plate pack,Carrying bar,Guiding bar,Plate,Frame - M15 and larger,
