The effect of synthetic zinc corrosion products on corrosion of electrogalvanized steel. II. Zinc reactivity and galvanic coupling zinc/steel in presence of zinc corrosion products

被引：42
|
作者：
Yoo, J. D. [1 ]
Ogle, K. [1 ]
Volovitch, P. [1 ]
机构：
[1] Chim ParisTech, ENSCP, CNRS, UMR 7045, F-75231 Paris 05, France
来源：
CORROSION SCIENCE | 2014年 / 83卷
关键词：
Zinc; Steel; Oxygen reduction; Atmospheric corrosion; Polarization; REDEPOSITION PROCESSES; ATMOSPHERIC CORROSION; CARBONATE SOLUTIONS; AQUEOUS ALKALI; FILM FORMATION; CUT-EDGES; LAYER; PASSIVATION; ELECTROLYTE; DISSOLUTION;
D O I：
10.1016/j.corsci.2013.12.024
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The reactivity of zinc under synthetic zinc patinas and the galvanic coupling in steel/patina/Zn are studied. Zn-5(OH)(6)(CO3)(2) and Na2Zn3(CO3)(4).3H(2)O inhibit zinc anodic dissolution in NaCl, while Zn-5(OH)(8)Cl-2 H2O and Zn-4(OH)(6)SO4 nH(2)O do not. The galvanic current in steel/patina/NaCl/Zn is smaller as compared to steel/NaCl/Zn. The inhibiting effect decreases with time for Na2Zn3(CO3)(4).3H(2)O or Zn-4(OH)(6)SO4 nH(2)O due to the transformation into Zn(OH)(2). In NaHCO3, the polarity between zinc and steel can reverse. The effect of confinement on the cathodic current is stronger than the initial effect of patina which is explained by the instability of the patinas under rapid pH-increase. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：32 / 37
页数：6
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