A STUDY OF GALVANIC CORROSION DURING COULOMETRIC DISSOLUTION OF GALVANNEALED STEEL

被引：23

作者：

BESSEYRIAS, A ^{[1
]}

DALARD, F ^{[1
]}

RAMEAU, JJ ^{[1
]}

BAUDIN, H ^{[1
]}

机构：

[1] CED,SOLLAC,F-60761 MONTATAIRE,FRANCE

来源：

CORROSION SCIENCE | 1995年 / 37卷 / 04期

关键词：

Coulometric dissolution - Galvanic corrosion - Galvanostatic stripping - Potentiodynamic analysis;

D O I：

10.1016/0010-938X(94)00155-Y

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Galvanostatic stripping is used as a coating structure analysis technique for galvannealed steel sheet. The thickness of the coating determined in this way is underestimated by about 20% compared to the thickness measured by chemical dissolution. This study has shown that pH, electrolyte composition and current density affect coulometric measurements. Because of additional galvanic current between zinc rich zinc-iron phases and more noble phases (iron rich zinc-iron phases), hydrogen evolves during anodic stripping. This is especially observed at low current density. Also the duration of coulometric anodic dissolution cannot give the actual coating thickness. Potentiodynamic analysis tends to show that potentials observed on galvanostatic stripping curves are the result of different iron-zinc phase layers.

引用

页码：587 / 595

页数：9

共 9 条

[1]

Baudin H., 1992, 2ND GALV 92 INT C ZI, P455

[2]

CIESLAK L, 1980, OCHRONA PRZED KOROZJ, V23, P221

[3]

HOLLUB R, 1981, POVRCHOVE UPRAVY, V21, P35

[4]

LANDRIAULT JP, 1987, CIM B, V71, P71

[5]

LUCAS P, 1989, GALVATECH, V89, P138

[6]

MATHIEU S, 1981, B CERCL ETUD MET, V14, P257

[7]

MOFFATT WG, 1957, HDB BINARY PHASE DIA, V3, P6

[8] ELECTROCHEMICAL STRIPPING OF GALVANNEALED COATINGS ON STEELS [J].

ZHANG, XG ;

BRAVO, IC .

CORROSION, 1994, 50 (04) :308-317

[9]

1985, INSTRUMENTAL METHOD

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