论文部分内容阅读
通过暴露试验、腐蚀产物的表面分析和电位测量,证明了镀锌管在北京市地热水中有着良好的耐蚀性.地热体系中的二氧化碳 (或HCO_3~-) 的存在扩大了锌的钝化区,表面生成的ZnO·CO_2·4H_2O和ε-Zn(OH)_2对基体有保护作用.在90℃以下锌镀层相对基体材料是阳极性镀层,可以对基体材料提供阴极保护.少量硫化氢的存在不会破坏锌层在地热体系中的耐蚀性.
Through the exposure test, the surface analysis of the corrosion products and the potential measurement, galvanized pipe has been proved to have good corrosion resistance in geothermal water of Beijing. The presence of carbon dioxide (or HCO 3 -) in geothermal system enlarges the corrosion resistance of zinc The ZnO · CO 2 · 4H 2 O and ε-Zn (OH) 2 generated on the surface of the zone have a protective effect on the matrix. The zinc coating relative to the substrate below 90 ℃ is anodic coating, which can provide cathodic protection for the matrix. A small amount of hydrogen sulfide The existence of zinc does not undermine the corrosion resistance of the geothermal system.