Electrochemical investigation of locally depassivated iron. A comparison of various techniques

✍ Scribed by R. Oltra; C. Gabrielli; F. Huet; M. Keddam

• Book ID: 103066037
• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 719 KB
• Volume: 31
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(86)87068-2

✦ Synopsis

Electrochemical aspects of the damage mused m situ to the passive film on iron have been investigated by means of ac impedance and spectral analysis of the current fluctuations These techniques can provide useful information on the individual depassivation-repassivatton transient and its interaction with the surrounding passive surface It has been shown that it is rather difficult to define an intrinsic rate of repassivation which could be independent of the depasstvation technique Firstly the repassivation has been studied by potential jump experiments Secondly depassivation by abrasion due to the projection of a suspension of particles or focused laser pulse have been developed The results are discussed in terms of the classical model involving a sequence of depassivation-repassivatton events induced by local breakdown of the film