中国电机工程学报2012，Vol.32Issue(2)：67-72,6.
锅炉水冷壁管材料20G和15CrMo在含Cr溶液中的点蚀特性
Pitting Corrosion Characteristics of Boiler Water-wall Tubes Influenced by 20G and 15CrMo Materials in CI- Solution
摘要
Abstract
In order to investigate the influence of Cl- on the pitting corrosion of water-wall tube 20 G and 15CrMo materials at room temperature and high temperature, a series of experiments including electrochemical measurement and high-temperature weight loss were carried out. The tested specimen surface was characterized by transmission reflection metallurgical microscopy, scanning electron microscopy （SEM）, energy dispersive spectrometer （EDS）, and X-ray diffraction （XRD）. The experiment results show that Cl- accelerate pit corrosion of 20 G and 15CrMo specimens at room temperature, 15CrMo specimens have higher corrosion resistance than 20G specimens, and Cl- also accelerate corrosion at high temperature. The corrosion mechanism of C1- for water-wall tube is the competitive adsorption mechanism of C1- and OH- at room-temperature, an intermediate complex （FeOHCl） is formed; Cl- acted as a catalyst at high-temperature, which induce the Fe2＋ hydrolysis, and form loose and unprotected Fe3O4 film. In the actual operation of power plant, Cl- concentrations must be controlled less than 0.2 mg/L in feed water.关键词
锅炉/水冷壁管/20G/15CrMo/Cl-/点蚀Key words
boiler/water-wall tubes/20 G/15CrMo/Cl-/pitting corrosion分类
能源科技引用本文复制引用
朱志平,熊书华,赵永福,郭小翠,周瑜..锅炉水冷壁管材料20G和15CrMo在含Cr溶液中的点蚀特性[J].中国电机工程学报,2012,32(2):67-72,6.基金项目
湖南省自然科学基金项目(09JJ6067) （09JJ6067）
湖南省科技攻关项目(2010GK3171). （2010GK3171）
