Electronic properties and corrosion resistance of passive films on austenitic and duplex stainless steels

被引：116
作者：
Tranchida, G. [1 ]
Clesi, M. [1 ]
Di Franco, F. [1 ]
Di Quarto, F. [1 ]
Santamaria, M. [1 ]
机构：
[1] Univ Palermo, Electrochem Mat Sci Lab, DICAM, Viale Sci,Ed 6, I-90128 Palermo, Italy
来源：
ELECTROCHIMICA ACTA | 2018年 / 273卷
关键词：
Passive films; Chromium; Duplex stainless steel; Austenitic stainless steel; Photoelectrochemistry; Corrosion resistance; Mott-Schottky; RAY PHOTOELECTRON-SPECTROSCOPY; SCANNING-TUNNELING-MICROSCOPY; SEMICONDUCTING PROPERTIES; MOTT-SCHOTTKY; OXIDE LAYERS; XPS; CHROMIUM; BEHAVIOR; ACID; IRON;
D O I：
10.1016/j.electacta.2018.04.058
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Passive films were grown at constant potential in acidic (pH similar to 2) and alkaline (pH similar to 13) solutions on chromium, AISI 304L, AISI 316L and Duplex stainless steels. Passive films on chromium grow following a high field mechanism considering the presence of dissolution phenomena. According to the photoelectrochemical characterization, passive films on Cr have a bandgap of 3.4 eV when formed in acidic solution, and of 2.4 eV when formed in alkaline solution due to the formation of Cr(OH)(3). These films result to be poorly stable against anodic dissolution due to a very anodic flat band potential. Conversely, impedance and photoelectrochemical measurements proved that passive films on stainless steels are chromium rich oxide n-type semiconductors with a very high polarization resistance. Their band gap depends on the pH of the passivation solution and on the SS composition. (c) 2018 Elsevier Ltd. All rights reserved.
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收藏
页码：412 / 423
页数：12
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