应用动电位招描法研究锅炉酸洗钝化条件  

A STUDY ON PASSIVATING CONDITION IN BOILER CHEMICAL CLEANING PROCESS BY POTENTIAL SCANING ANODIC POLARIZATION

作　　者：杨昌柱[1] 濮文虹[1] 杨道武[1] 周琼花[1] 龚洵洁[1] 

机构地区：[1]长沙电力学院,武汉水利电力大学

出　　处：《热力发电》1996年第6期44-47,58,共5页Thermal Power Generation

摘　　要：于国内首次应用动电位扫描法研究了锅炉酸洗钝化的主要控制参数。首先实验确定了合适的电势扫描速度，然后将试片放入待试溶液中，测定各种ｐＨ及Ｃｌ－条件下碳钢的致钝电势、钝化区宽度、过钝化电势及点蚀倾向等。结果显示：若要在碳钢表面获得致密的保护膜，钝化过程的主要控制参数为：ｐＨ＞９．０（若存在［Ｃｌ－］，ｐＨ＞９．５），Ｃｌ－＜１００ｍｇ／Ｌ以及合适的氧化剂浓度。A study on passivating parameter in boilers chemical cleaning process is for the first time in China carried out with potential scanning anodic polarization technique. At first , a suitable scanrate was selected through experiment, then the active-passive transition potential, passive region, passive- transpassivation transition potential and pitting trend of carbonsteels were determined in 0. 3% HL solutions with various PH and CI- concentration. The results show that the main parameters should be controlled as following, pH >9. 0(>9. 5 if presence of Cl-),[Cl-]<100mg/L,and adequate oxidizerconcentration in order to form tight,adherent and Protective film at the surface of carbon steels during passivating.

关 键 词：锅炉 动电位扫描 化学净化 

分 类 号：TK228[动力工程及工程热物理—动力机械及工程]