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一、概论 给水金属管道的腐蚀,起因多种多样,主要的: 1.双金属电池腐蚀:由二种不同的金属或不同成份组成的一种金属(合金),接触于同一水体而发生的腐蚀,是电化学腐蚀的一种形式。 2.浓度电池腐蚀:由于金属离子浓度、溶解氧浓度等不同,产生电池效应而发生的腐蚀,是电化学腐蚀的另一形式。 3.化学腐蚀:直接或间接与水化学反应引起的腐蚀。在给水系统金属腐蚀的过程中,纯粹的化学腐蚀比微生物催化下的电化学腐蚀次要得多,它总是与电化学腐蚀交叉一起进行的。
I. Overview of the corrosion of water supply metal pipes, causes a variety of, mainly: 1. Bimetallic battery corrosion: corrosion caused by two different metals or different components of a metal (alloy), contact with the same body of water , is a form of electrochemical corrosion. 2. Concentration battery corrosion: Due to the different concentration of metal ions, dissolved oxygen concentration, etc., corrosion that occurs due to the battery effect is another form of electrochemical corrosion. 3. Chemical corrosion: Corrosion caused by direct or indirect chemical reaction with water. In the process of metal corrosion in the feedwater system, pure chemical corrosion is much less important than the electrochemical corrosion catalyzed by microorganisms. It is always carried out in conjunction with electrochemical corrosion.