Waste incineration corrosion processes: Oxidation mechanisms by electrochemical impedance spectroscopy

• Published in: Materials and corrosion Vol. 59; no. 7; pp. 566 - 572
• Main Authors: Pérez, F. J., Hierro, M. P., Nieto, J.
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 01-07-2008; WILEY‐VCH Verlag; Wiley-VCH
• Subjects: Applied sciences; Corrosion; Corrosion environments; electrochemical impedance; Exact sciences and technology; Metals. Metallurgy; molten salt corrosion; waste incineration; Corrosion mechanism; Corrosion; Incineration; Oxidation; Impedance; Application; Waste disposal
• ISSN: 0947-5117; 1521-4176
• DOI: 10.1002/maco.200804139

Molten chloride mixtures are formed in waste incineration plants during waste firing and energy production. These mixtures are responsible for degradation processes like hot corrosion. In order to evaluate the damage of molten salt mixtures in waste incineration environments, the alloys 625 and 617 were exposed beneath a molten KCl‐ZnCl2 mixture at 650 °C in air. The corrosion process was monitored by electrochemical impedance spectroscopy (EIS). An extensive microscopy analysis has been done in order to correlate the electrochemical results, and to establish an electrochemical mechanism for such high temperature corrosion processes.