Metallic materials — cheap steels in particular — are preferred for the construction of process equipment for the chemical industry and also for electrochemical plants. But electrolytes are always corrosive towards metals. Because of their ionic conductivity and their protonic and/or basic properties they favour corrosion by formation of local elements for instance by cathodic O2 reduction or H2 evolution combined with anodic metal dissolution. Since the metallic elements which constitute the usual steels — in particular iron — are less noble than hydrogen, steels will always tend to corrode and the tendency to corrode will even be enhanced in oxygen-containing electrolytes unless the metals are not passivated by alloy-components like Cr, Mo or Ni, to speak only of the most common passivating additives, which tend to form dense and passivating oxide layers.
KeywordsTitanium Nickel Mercury Sludge Rubber
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- K. Kaesche, Die Korrosion der Metalle, Springer-Verlag, Berlin, Heidelberg, New York 1979Google Scholar
- A. Rahmel, W. Schwenk, Korrosion und Korrosionsschutz von Stählen, Verlag Chemie, Weinheim, New York, 1977Google Scholar
- E. Heitz, R. Henkhaus, A. Rahmel, Korrosionskunde im Experiment, Verlag Chemie, Weinheim, Deertield Beach, Basel 1983Google Scholar
- K. Scott, Electrochemical Process Engineering, Plenum Press, New York 1995Google Scholar