Journal
SURFACE AND INTERFACE ANALYSIS
Volume 34, Issue 1, Pages 164-170Publisher
JOHN WILEY & SONS LTD
DOI: 10.1002/sia.1275
Keywords
AISI 316Ti austenitic stainless steel; dry air oxidation; pressurized aqueous oxidation; XPS depth profiling; XRD; oxide layer growth
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The oxidation of austenitic stainless steel (316Ti) under dry oxidation and under pressurized aqueous conditions, both at similar to300degreesC, was studied by applying XPS, depth profiling and x-ray diffraction. After dry oxidation a relatively smooth surface was found, depleted of chromium, nickel and molybdenum and leaving behind nearly exclusively iron oxides. In the oxide layer chromium oxides were detected, followed by metallic nickel and molybdenum. The growth of the whole oxide layer follows a logarithmic growth law. Under aqueous conditions a rougher surface was found, with oxide layers being a factor of greater than or equal to10 thicker than under dry oxidation conditions. A greater variety of the oxides were found, e.g. chromium and nickel oxides and hydroxides are present in considerable amounts already at the sample surfaces. Again, molybdenum is first detected in the oxide layer. During the first 60 days of steel oxidation in pressurized water, the oxide layer formation follows a parabolic growth law. Copyright (C) 2002 John Wiley Sons, Ltd.
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