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Effects of Thermal Oxidation and Subsequent Pickling on Pitting Geometry of Austentitic Stainless Steels in Chloride Solutions

  • Vesna Alar , Ivan Esih , Ivan Budic and Slavonski Brod
Published/Copyright: May 26, 2013
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Abstract

Harmful effects of thermal oxides formed on austenitic stainless steels (SS) like AISI 304 and 316L by heating in air or other oxidizing gases on their pitting liability in chloride solutions have been studied by pursuing geometric characteristics of corrosion process (pits density, their depths, and mouth areas, ie. penetrating and superficial detrimental consequences etc.). The possibility of preventing the decay of thermally oxidized austenitic SS by chemical removal (pickling) of oxides before exposure to chloride solutions was successfully applied on simple specimens but serious difficulties arose on welded parts and on parts exposed to other temperature gradients during manufacture or in exploitation.

Kurzfassung

In der diesem Beitrag zugrunde liegenden Studie wurden die schädlichen Auswirkungen von thermischen Oxiden, die sich durch Erhitzen in Luft auf austenitischen Stählen wie AISI 304 und 316 L bilden, hinsichtlich der Lochkorrosionsbeständigkeit untersucht, in dem den Charakteristika der Lochgeometrie (Lochdichte, Lochtiefe und Lochränder, also Durchdringung und schädliche Konsequenzen für die Oberfläche) nachgegangen wurde. Die Möglichkeit zur Prävention einer Schädigung von thermisch oxidierten austenitischen Stählen durch chemische Entfernung der Oxide (Beizen) vor der Exposition in den Chloridlösungen wurde erfolgreich an einfachen Proben nachgewiesen. Jedoch ergaben sich erhebliche Schwierigkeiten für geschweißte Teile und an solchen Proben, die anderen thermischen Gradienten während der Fertigung oder Produktion ausgesetzt waren


Vesna Alar, born 1966, graduated at the Faculty of Chemical Engineering and Technology at the University of Zagreb in 1991. Since 1991 she has been working at the Department of Materials of the Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb. In 1994 she acquired the Master's degree at the Faculty of Chemical Engineering and Technology and the Doctor's degree in 2000 at the Faculty of Mechanical Engineering and Naval Architecture in Zagreb. The scientific work includes research in the field of corrosion and protection metals.

Ivan Esih, born 1929 in Zagreb graduated in Chemical Engineering in 1954 at the Faculty of Chemical Technology, University of Zagreb. He attained his Ph. D. in Chemistry in 1970 at the University of Zagreb. His scientific work includes research in the fields of corrosion processes (especially pitting of stainless steels and erosion corrosion), application and evaluation of protective coatings on metals and electroforming of moulds and abrasive tools.

Ivan Budic, born 1948, graduated at the Faculty of Mechanical Engineering and Naval Architecture (FSB) at the University of Zagreb in 1976. He acquired the Master's degree in 1988 at FSB, University of Zagreb and Doctor's degree in 1994. The scientific work includes research in the field of foundry design and manufacturing processes.


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Published Online: 2013-05-26
Published in Print: 2011-10-01

© 2011, Carl Hanser Verlag, München

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