Evaluation of the Degree of Sensitization of a Stainless Steel 304 Using Local Electrochemical Impedance Spectroscopy

Autor:	Alejandro Tonatiu Velazquez Sanchez, Héctor Cruz Mejía, Carlos Alberto Gonzalez Rodriguez, Gonzalo Galicia Aguilar
Rok vydání:	2013
Předmět:	medicine.anatomical_structure Materials science Metallurgy medicine Composite material Sensitization Degree (temperature) Dielectric spectroscopy
Zdroj:	ECS Transactions. 47:123-129
ISSN:	1938-6737 1938-5862
Popis:	In this work the degree of sensitization of several samples of austenitic stainless steel 304 sensitized at 600 and 700 °C during 1h, was determined by Local Electrochemical Impedance Spectroscopy. The experimental methodology consisted of several steps. Firstly, a chemical analysis of each sample was realized by spark emission spectroscopy, after a metallographic characterization was done and finally tests of double loop- electrochemical potentiodynamic reactivation (DLEPR) were applied in each sample. Additionally, carbides precipitation in the border grain was observed using a Scanning Electron Microscopy (SEM). The spectra of local impedance were realized into austenitic grain, the results obtained showed a capacitive behavior. On the other hand in the grains limits (where chromium carbides are formed), a resistive – capacitive behavior is observed. This difference indicates what zone is most susceptible to intergranular corrosion (CIG), whereas DLEPR is unable to discern any evidence about this.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::63b5b025be1de6e11fe2a353e725656e https://doi.org/10.1149/04701.0123ecst Zobrazit plný text záznamu