A New Indication System for Demonstration of a Corrosion Differential Aeration Cell

Authors

  • Pavel Novák Department of Metals and Corrosion Engineering, Institute of Chemical Technology Prague,Prague
  • Tomáš Hron Department of Metals and Corrosion Engineering, Institute of Chemical Technology Prague,Prague
  • Šárka Msallamová Department of Metals and Corrosion Engineering, Institute of Chemical Technology Prague,Prague
  • Milan Kouřil Department of Metals and Corrosion Engineering, Institute of Chemical Technology Prague,Prague

Keywords:

corrosion cell with differential aeration, cathodic iron passivation, ferroxyl indicator, 2,2′-bipyridyl

Abstract

A new indication system was designed to demonstrate a differential aeration cell on iron in a drop experiment in NaCl solution (30 g L-1). Bromethymol blue (0.4 g L-1) and 2,2′-bipyridyl (0.5 g L-1) were used for the indication of elevated alkalinity and ferrous ions, respectively. The new indication system has no corrosion stimulating effects as the traditional ferroxyle indicator (hexacyanoferrite + phenolphthalein) and indicates more reliably formation of anodic and cathodic zones in dependence on the surface accessibility for air oxygen. The new indication system can fully replace the ferroxyle indicator for demonstrations of other types of corrosion cells as well.

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Published

2011-04-15

How to Cite

Novák, P., Hron, T., Msallamová, Šárka, & Kouřil, M. (2011). A New Indication System for Demonstration of a Corrosion Differential Aeration Cell. Chemické Listy, 105(4), 273–277. Retrieved from http://blog.chemicke-listy.cz/ojs3/index.php/chemicke-listy/article/view/1156

Issue

Vol. 105 No. 4 (2011)

Section

Articles