摘要
针对不同阴极电流密度下生成的水垢样品,通过扫描电镜及X射线衍射技术分析了样品表面形貌与晶型组成。结果显示:加电过程会极大地改变水垢的形貌及晶型,使其由不加电时100%方解石水垢转变为以文石占主要成分的混合水垢;在15A/m2及20A/m2低电流密度下生成的水垢中文石的质量分数分别为90.23%及82.65%,远超过50A/m2高电流密度情况(69.37%),且形貌上也有所改变,表明阴极电流密度不仅会影响水垢的宏观处理效果,也会影响微观形貌及结构组成。该结果可为电化学除垢技术研究提供参考。
Scale samples generated by different cathodic current densities were characterized by scanning electron microscope and the X-ray diffraction method to analyze their surface morphology and polymorph composition.The results show that the electrochemical treatment would greatly change the scale morphologies and crystalline form.The scale sample changed from pure calcite powder without electrolysis to the mixed powder after electrolysis,in which the aragonite form was dominant.The mass fractions of aragonite form in the mixed powder were 90.23% and 82.65% for the samples generated at 15 A/m2 and 20 A/m2,respectively,more than 69.37% for the sample generated at 50 A/m2.Moreover,the morphology of the samples was quite different.These results indicate that the cathodic current density can not only influence the macro effect of scale removal treatment,but also change the micro morphology,the structure,and the composition of the generated scale.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2013年第7期47-51,共5页
Journal of Xi'an Jiaotong University
基金
教育部博士点基金资助项目(20090201110005)
中央高校基本科研业务费资助项目
关键词
电化学
水垢
电流密度
形貌
晶型
electrochemical
scale
current density
morphology
crystalline form
