Photocurrent spectroscopy study of passive films on hafnium and hafnium-tungsten sputtered alloys

被引：22

作者：

Di Quarto, F

Santamaria, M

Skeldon, P

Thompson, GE

机构：

[1] Univ Palermo, Dipartimento Ingn Chim Proc & Mat, I-90128 Palermo, Italy

[2] Univ Manchester, Ctr Corros & Protect, Manchester M60 1QD, Lancs, England

来源：

ELECTROCHIMICA ACTA | 2003年 / 48卷 / 09期

关键词：

sputtered Hf; sputtered W-Hf alloys; passive films; anodic oxides; photocurrent spectroscopy (PCs);

D O I：

10.1016/S0013-4686(02)00825-3

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Anodic and air-formed films on sputtered Hf and W-Hf alloys of different composition have been investigated by Rutherford back scattering, photocurrent spectroscopy (PCS) and transmission electron microscopy (TEM) techniques. In alkaline solutions the PCs data suggest the formation on Hf metal of a duplex layer with anodic hafnia covered by an external layer of composition close to HfO(OH)(2). This last compound is also present on Hf air-formed films. In acidic solutions the initial oxy-hydroxide film disappears at high anodising potentials (V(f) > 10 V). In the case of W-Hf alloys films of different composition and semiconducting behaviour are formed by air exposure or by anodising in different electrolytes. A PCs analysis of films grown on sputtered alloys is performed on the basis of previously proposed correlation between the band gap of anodic films and difference of electronegativity of their constituents. (C) 2003 Elsevier Science Ltd. All rights reserved.

引用

页码：1143 / 1156

页数：14

共 41 条

[11] KINETICS OF GROWTH OF AMORPHOUS WO3 ANODIC FILMS ON TUNGSTEN [J].

DIQUARTO, F ;

DIPAOLA, A ;

SUNSERI, C .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1980, 127 (05) :1016-1021

[12] Photoelectrochemical characterization of thin anodic oxide films on zirconium metal [J].

DiQuarto, F ;

Piazza, S ;

Sunseri, C ;

Yang, M ;

Cai, SM .

ELECTROCHIMICA ACTA, 1996, 41 (16) :2511-2521

[13] PHOTO-ELECTROCHEMICAL STUDY OF THE AMORPHOUS-WO3-SEMICONDUCTOR ELECTROLYTE JUNCTION [J].

DIQUARTO, F ;

RUSSO, G ;

SUNSERI, C ;

DIPAOLA, A .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS I, 1982, 78 :3433-3445

[14]

DIQUARTO F, 2001, UPB SCI B B, V63, P45

[15]

DIQUARTO F, 2001, S AA STRUCTURE PROPE, V654

[16]

EPLANDIU MJ, 1997, ELECTROCHIM ACTA, V42, P1315

[17]

EPLANDIU MJ, 1993, J ELECTROANAL CHEM, V353, P161

[18]

EPLANDIU MJ, 1995, ELECTROCHIM ACTA, V40, P809

[19] MODELS FOR THE DISCUSSION OF THE PHOTO-ELECTROCHEMICAL RESPONSE OF OXIDE LAYERS ON METALS [J].

GERISCHER, H .

CORROSION SCIENCE, 1989, 29 (2-3) :257-266

[20] Effects of alloying elements in anodizing of aluminium [J].

Habazaki, H ;

Shimizu, K ;

Skeldon, P ;

Thompson, GE ;

Wood, GC ;

Zhou, X .

TRANSACTIONS OF THE INSTITUTE OF METAL FINISHING, 1997, 75 :18-23

← 1 2 3 4 5 →