Journal
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
Volume 5, Issue 1-2, Pages 195-200Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1016/j.stam.2003.10.014
Keywords
passive film; stainless steel; additive elements; photoelectrochemical response; electrochemical impedance
Categories
Ask authors/readers for more resources
The semiconductor properties of passive films formed on an Fe-18Cr alloy with various additive elements in a borate buffer solution were studied using electrochemical impedance spectroscopy and photoelectrochemical response. The photocurrent was plotted as a photoelectrochemical action spectrum that could be separated into two components, which were mainly derived from Cr oxide (E-g = 3.4 eV) and Cr hydroxide (E-g = 2.4 eV). The band gap energy, E., of each component was almost constant, independent of the species an amount of additive elements. The photoelectrochemical response showed positive photocurrent for most potential in the passive region, which indicates that the passive film behaved as an n-type semiconductor. In addition, the Mott-Schottky plot of the capacitance showed positive slope, which also means that the passive films behaved as an n-type semiconductor. The donor density of the passive films, which can be estimated by the Mott-Schottky plots, changes depending on the film formation potentials and a variety of additives. (C) 2003 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available