Small electrodes of platinum, rhodium, palladium, iridium and gold were polarized with alternating current and alternating current biased with direct current. Only those metals which dissolve hydrogen-platinum and palladium-produced metal-black surfaces with alternating current polarization. The dis
The influence of alternating potential or current polarization on the corrosion rates of metals
β Scribed by P.J. Gellings
- Publisher
- Elsevier Science
- Year
- 1962
- Tongue
- English
- Weight
- 300 KB
- Volume
- 7
- Category
- Article
- ISSN
- 0013-4686
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β¦ Synopsis
The influence of alternating potential or current polarization on the corrosion rate of a metal is studied theoretically, neglecting possible rectification due to semi-conducting properties of passive films. The conditions necessary for a change in the stationary-state corrosion rate are deduced and it is shown that in many practical cases such a change does result.
This change, however, will in most cases be rather small as is shown by some calculations on typical cases.
R&sumk--Etude theorique, abstraction faite des propri&& semi-conductries eventuelles de films passivants, de l'influence d'une tension ou d'un courant de polarisation alternatifs sur la vitesse de corrosion d'un m&al. 11 est ainsi montre que dans la plupart des cas, cette influence est pratiquement faible. Zusammenfassung-Der Einfluss, den eine Polarisation durch Wechselstrom oder Wechselspannung auf die Korrosionsgeschwindigkeit eines Metalls ausiibt, wird theoretisch untersucht, wobei eine allfallige Gleichrichtung durch Halbleitereigenschaften passiver Filme vernachl%sigt wird. Die filr eine Aenderung der stationgren Korrosionsgeschwindigkeit notwendigen Bedingungen werden abgeleitet, und es wird gezeigt, dass in vielen FLllen eine solche Ver;inderung vorliegt. Diese Aenderung ist jedoch meistens klein, wie die Berechnung in einigen typischen FLllen zeigt.
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