Temperature Effect on the Corrosion Behaviour of Alloy 31 in polluted H3PO4 and Analysis of the Corrosion Products by Laser Raman Microscope

[EN] Electrochemical behaviour of Alloy 31, a highly alloyed austenitic stainless steel (UNS N08031), in a 40 wt.% H3PO4 solution polluted with 2 wt.% H2SO4, 0.06 wt.% KCl and 0.6 wt.% HF was evaluated by cyclic potentiodinamic curves at different temperatures (20, 40, 60 and 80 degrees C). Temperature was found to favour both cathodic and anodic reactions. The corrosion products forming on the surface of Alloy 31 were indentified in situ by Laser Raman microscope. Corrosion products were mainly iron and chromium oxides, although phosphates were also included as a corrosion product on the surface of Alloy 31.Authors express their gratitude to the MAEC of Spain (PCI Mediterráneo C/8196/07, C/018046/08, D/023608/09 and D/030177/10), to Programa de Apoyo a la Investigación y Desarrollo de la UPV (PAID-06-09) and to the Generalitat Valenciana (GV/2011/093) for the financial support, to Ministerio de Ciencia e Innovación for its help in the Laser Raman Microscope acquisition (UPOV08-3E-012) and to Dra. Asunción Jaime for her translation assistance.Escrivá Cerdán, C.; Blasco-Tamarit, E.; García-García, D.; Garcia-Anton, J.; Ben-Bachir, A. (2012). Temperature Effect on the Corrosion Behaviour of Alloy 31 in polluted H3PO4 and Analysis of the Corrosion Products by Laser Raman Microscope. International Journal of Electrochemical Science. 7(7):5754-5764. http://hdl.handle.net/10251/61165575457647