Precipitation Characteristics of CaCO3 Scaling on Stainless Steel in Cooling Tower Condition
Stainless steel 304 and 316 (ss304 and ss316) are widely used in heat exchangers, and the precipitation characteristics of CaCO3 is the first step to research anti-fouling technology.CaCO3 scaling precipitated on coupons from 1.0mmol/l CaCO3 solution at 35℃.By weighing the coupons before and after static reaction experiments to get the mass of scaling and the morphology was taken by Scanning Electron Microscope (SEM).The results show that at the same condition there is more fouling on ss304 than ss316.Higher pH not only promotes square aragonite and calcite and square aragonite gradually recrystallize to calcite but also makes both homogeneous and heterogeneous nucleation rate increasing, and the former increases more, so the fouling mass is bigger at lower pH than higher pH; fouling grows at the place with higher surface energy first and then extend to surrounding place, and when the number increases and crystals grow big and connect each other to form fouling layer.
CaCO3 crystallization fouling Coupon test Crystal morphology
Jian Sheng Hua Zhang
School of Power and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,PRC
国际会议
上海
英文
1029-1033
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）