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- W2138012375 abstract "Microcapillary-based techniques allow the selection and interrogation of single metallurgical sites and are therefore becoming increasingly popular to investigate the electrochemical behaviour of metallic phases and nonmetallic heterogeneities in alloys. One drawback of this technique is the 'static nature' of the environment, that is, the lack of diffusion which is associated with 'closed' systems. This current study has been carried out to assess the differences between current measurements made using a 'closed' micro-capillary system with current measurements derived from a flowing 'open' microcapillary droplet cell. The results of this study allow an assessment of the parameters responsible for the mass transport and distribution of species in the closed and open systems. Local polarisation experiments were carried out under both static and flow conditions and compared to the global curves obtained under traditional macro-scale polarisation conditions. Electrochemical measurements were performed on a 316L stainless steel in 1.7M NaCl, pH=3, by means of the electrochemical microcell technique, the scanning droplet cell (SDC) and the classical three-electrode cell. Particular attention was paid to the influence of mass transfer on the cathodic processes. The experimental results were compared with calculations derived from a model system adopting a finite element approach. The corrosion system consists of three parallel electrochemical reactions: two cathodic reactions (the oxygen reduction reaction and the hydrogen evolution reaction) and one anodic reaction (iron dissolution reaction). All these reactions take place at the surface of the metal electrode. Comparative experimental results have show there is a large discrepancy between the magnitudes of the cathodic current obtained by the two techniques. Numerical simulation was then used to identify the critical parameters, for example, microcell crevice geometry, specimen surface-capillary gap distance etc, which lead to the significant modifications of the curves." @default.
- W2138012375 created "2016-06-24" @default.
- W2138012375 date "2007-01-01" @default.
- W2138012375 modified "2023-10-18" @default.
- W2138012375 title "Evaluating the Cathodic Process Using Static and Dynamic Experimental Micro-Capillary Based Techniques." @default.
- W2138012375 doi "https://doi.org/10.1149/ma2007-02/14/892" @default.
- W2138012375 hasPublicationYear "2007" @default.
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