Abstract
Abstract A description is given of an instrumental method developed for continuous observation of corroding metal specimen surfaces in water. The method involves illuminating an immersed panel with a beam of light that strikes the metal surface at a small angle and recording the produced electrical current by a phototube pickup of the light scattered by the metal surface. For this method of measurement to be useful, three conditions must be met: (1) Sample surface must be reasonably smooth at the outset, (2) Corrosive medium must be transparent, (3) Corrosion rate must be appropriate for measurement. The light-scattering method was used for measuring corrosion rates of galvanized steel surfaces in distilled water. Results were comparable with those found by stack-test failure and corrosion weight-loss measurement. The light-scattering method required less time to give quantitative results than did either of the other methods. 2.3.6
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