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一、前言牺牲阳极法电化学保护发明有150多年的历史了。在科学突飞猛进的伟大时代里,这一古典的方法不但没有被淘汰,反而更加广泛地应用在各种环境中。牺牲阳极法是对地下、水中、化工介质及诲洋中金属构筑物进行电化学保护的有效方法之一。它具有不需外加电源、施工简单、管理方便、对邻近构筑物不造成干扰等特点,对于有交流感应电压的地下管道牺牲阳极还可兼作接地排流作用,故牺牲阳极法是城市金属管道、电缆及区域性管网较理想的保护方法。通常使用的牺牲阳极有镁、铝、锌三类。根据国外的经验,一般在高电阻率的土壤及淡水中使用镁类阳极;在低电阻率的海
I. Preface Sacrificial anode method Electrochemical protection invented more than 150 years of history. In the great era of rapid scientific progress, this classical method has not only been eliminated, but has been more widely used in a variety of environments. Sacrificial anode method is one of the effective methods for the electrochemical protection of underground structures, water, chemical media and the metal structures in Yangyang. The utility model has the characteristics of no need of external power supply, simple construction, convenient management and no interference to the adjacent structures. The sacrificial anode for the underground pipeline with AC induced voltage can also double as the grounding drainage effect. Therefore, the sacrificial anode method is an urban metal pipe, And regional pipe network protection method is more ideal. Commonly used sacrificial anode magnesium, aluminum, zinc three categories. According to foreign experience, magnesium-based anodes are generally used in high-resistivity soils and freshwater; in the low-resistivity sea