Properties of zinc coatings electrochemically passivated in sodium molybdate

被引：6
作者：
Akulich, N. [1 ]
Ivanova, N. [1 ]
Zharskii, I. [1 ]
Joensson-Niedziolka, M. [2 ]
机构：
[1] Belarusian State Technol Univ, Dept Chem Technol Electrochem Prod & Elect Engn M, Sverdlov St 13a, Minsk 220006, BELARUS
[2] Polish Acad Sci, Inst Phys Chem, Dept Electrode Proc, Kasprzaka 44-52, PL-01234 Warsaw, Poland
来源：
SURFACE AND INTERFACE ANALYSIS | 2018年 / 50卷 / 12-13期
关键词：
corrosion; electrochemical impedance spectroscopy; electrochemical passivation; sodium molybdate; zinc coating; CONVERSION COATINGS; CORROSION PERFORMANCE; RESISTANCE; BEHAVIOR; MICROSTRUCTURE; PROTECTION; NITRATE; PART; XPS;
D O I：
10.1002/sia.6525
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Molybdenum compounds are considered to be promising, environmentally friendly substances for passivation of zinc coatings. Conversion coatings on electroplated zinc coatings obtained by cathodic polarization of a solution of molybdate of sodium with the addition of phosphoric acid are studied. These coatings had a pronounced needle-shaped structure and were homogeneous. X-ray photoelectronic spectroscopy analysis showed that zinc hydroxides and phosphates, Mo (VI), and Mo (V) compounds are present in the conversion coating. As part of this study, the influence of the current density and deposition time of the coating on the surface morphology and the chemical composition of conversion films was determined. Polarization measurements and electrochemical impedance spectroscopy have shown that the investigated coatings significantly increase the corrosion resistance of galvanized steel in chloride-containing solution.
引用
收藏
页码：1310 / 1318
页数：9
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