文献类型：期刊文献

中文题名：阴极保护原理之极化理论的新讨论

英文题名：Principles of the Cathodic Protection: a Discussion of Polarization Theory

作者：伍剑明 邓江 付磊 韦荣春 杨秀斌

第一作者：伍剑明

机构：[1]贵州理工学院材料与冶金工程学院

第一机构：贵州理工学院材料与冶金工程学院

年份：2017

卷号：44

期号：12

起止页码：163-165

中文期刊名：广东化工

外文期刊名：Guangdong Chemical Industry

基金：贵州省科学技术厅贵州理工学院科学技术联合基金(2001004040012);贵州理工学院博士启动项目(2003001044)

语种：中文

中文关键词：阴极保护;极化理论;防腐;电化学腐蚀

外文关键词：cathodic protection; polarization theory; anticorrosion;electrochemical corrosion

摘要：极化理论在较为完美地解释了金属设备阴极保护的防护原理的同时,亦存在着对防护体系中的最小保护电位、最小保护电流以及保护度等主要防护控制参数阐述不准确的问题。通过等效电路分析法,我们细化地分析了腐蚀电池阴、阳两极的微观电流构成,明确指出了目前理论所存在问题的根本原因,并提出了改进的极化理论图像。结合新图像,我们认为阴极保护体系的防护控制参数同时受阴、阳两极的初始电位以及两极各自的极化特性影响,其中:(1)体系的最小保护电位要低于阳极金属相的初始平衡电位;(2)最小保护电流由分别流经阴极和阳极的外加电流IEK和IEA组成;(3)当外加电流超过最大保护电流值时,系统的保护度会略有下降。
The polarization theory explains the mechanism of metal cathodic protection basically, but fails to interpret accurately the main controlling parameters, such as the minimum prolective potential, the minimum protective current and the percentage of protection, of the anticorrosion system. By the method of equivalent circuit analysis, we have discussed the micro-constitute of cathode and anode current of corrosion cell in detail, to make clear the reason of those inadequacies existed in the present polarization theory, as well as to put forward an improved theoretic image. In this work, we considered that the main controlling parameters of the anticorrosion system are influenced by both the primary equilibrium potential of cathode and anode, as well as their respective polarization properties. The conclusions are （ 1 ） the minimum protective potential is lower than the primary equilibrium potential of anode, and （2） the minimum protective current is composed of two parts includingIEKandIEA which are the impressed current transmitted through cathode and anode, and （3） the percentage of protection will decrease in some degree when the impressed current exceeds the maximum value of protective potential.