Stannate and permanganate conversion coatings on AZ31 magnesium alloy

被引：139

作者：

Zucchi, F. ^{[1
]}

Frignani, A. ^{[1
]}

Grassi, V. ^{[1
]}

Trabanelli, G. ^{[1
]}

Monticelli, C. ^{[1
]}

机构：

[1] Univ Ferrara, Dept Chem, Corros Study Ctr A Dacco, I-44100 Ferrara, Italy

来源：

CORROSION SCIENCE | 2007年 / 49卷 / 12期

关键词：

magnesium alloy; EIS; polarization curve; conversion coating; corrosion resistance;

D O I：

10.1016/j.corsci.2007.04.011

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The formation of stannate and permanganate-phosphate conversion coatings on AZ31 magnesium alloy was investigated in situ by EIS measurements and their protective performances were studied by different electrochemical techniques in diluted (0.05 M) sodium sulphate solution. The influence that short or long treatment times exert on the performances of such conversion coatings is discussed. While permanganate-phosphate baths always built layers characterized by penetrating cracks, long stannate baths produced layers without interconnected porosity, but were defective. This accounted for the initial greater protectiveness achieved with the stannate treatment; nevertheless, the easy penetration of the electrolytic solution through such a layer quickly decreased its corrosion resistance. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：4542 / 4552

页数：11

共 25 条

[1] A photoelectrochemical investigation of conversion coatings on Mg substrates [J].

Anicai, L ;

Masi, R ;

Santamaria, M ;

Di Quarto, F .

CORROSION SCIENCE, 2005, 47 (12) :2883-2900

[2] The corrosion of pure magnesium in aerated and deaerated sodium sulphate solutions [J].

Baril, G ;

Pébère, N .

CORROSION SCIENCE, 2001, 43 (03) :471-484

[3] AC impedance spectroscopy in characterizing time-dependent corrosion of AZ91 and AM50 magnesium alloys -: Characterization with respect to their microstructures [J].

Baril, G ;

Blanc, C ;

Pébère, N .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2001, 148 (12) :B489-B496

[4]

CANO F, 2000, INT C MAGN ALL APPL

[5] Conversion-coating treatment for magnesium alloys by a permanganate-phosphate solution [J].

Chong, KZ ;

Shih, TS .

MATERIALS CHEMISTRY AND PHYSICS, 2003, 80 (01) :191-200

[6]

FESER R, 1999, P EUROCORR 99 AACH D

[7]

GONZALESNUNEZ MA, 2005, 16 ICC BEIJ CHIN 19

[8] Kinetics of the development of a nonchromate conversion coating for magnesium alloys and magnesium-based metal matrix composites [J].

González-Nuñez, MA ;

Skeldon, P ;

Thompson, GE ;

Karimzadeh, H .

CORROSION, 1999, 55 (12) :1136-1143

[9] A NON-CHROMATE CONVERSION COATING FOR MAGNESIUM ALLOYS AND MAGNESIUM-BASED METAL-MATRIX COMPOSITES [J].

GONZALEZNUNEZ, MA ;

NUNEZLOPEZ, CA ;

SKELDON, P ;

THOMPSON, GE ;

KARIMZADEH, H ;

LYON, P ;

WILKS, TE .

CORROSION SCIENCE, 1995, 37 (11) :1763-1772

[10] Protective coatings on magnesium and its alloys - a critical review [J].

Gray, JE ;

Luan, B .

JOURNAL OF ALLOYS AND COMPOUNDS, 2002, 336 (1-2) :88-113

← 1 2 3 →