Resumo

BIDETTI, Bárbara Bidoia et al. A teaching experiment of corrosion using visual colorimetry. Quím. Nova [online]. 2012, vol.35, n.3, pp. 634-637. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40422012000300034.

In this paper, a simple and rapid method of evaluating galvanized steel sheet corrosion in a CuSO₄ solution, as an experimentation proposal for corrosion teaching. Galvanized steel corrosion is present in tanks and tubing by leading of natural or industrial waters which contain soluble copper compounds. This was the rationale for choosing the Cu²⁺ ions solution as an oxidizing agent. The method principle is based on visual colorimetry because the used oxidant has an intense blue color. Thus, a change in its concentration as a result of the corrosive process can be followed by a color intensity change in the solution thereby allowing evaluation of the corrosion rate.

Palavras-chave : chemistry education; corrosion; social interaction.