A Study of Transient Corrosion in the Iron‐Caustic System by Use of a Drop Weight Apparatus

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Abstract
Repassivation current transients in the Fe‐caustic system were measured after straining potentiostatically polarized electrodes with a drop weight apparatus, which could produce strains of about 5% in 1 msec. Peak current densities varied from 0.3 to 3.8 A/cm2 depending on electrode potential, electrolyte concentration, and temperature, and initial film coverage was complete in less than 1 or 2 msec. The amount of corrosion accompanying passive film formation was not very sensitive to the above‐mentioned electrochemical variables, and it ranged from . Repassivation was facilitated by additions to the test electrolyte of the anodic dissolution product . The total corrosion up to 1 sec following straining was a strong function of potential, electrolyte concentration, and temperature, as was the quasi steady‐state current density. The depth of corrosion 1 sec after straining ranged from twenty to several hundred angstrom units. The relevance of these results to several mechanistic models of caustic cracking is discussed.
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