A two-step roll coating phosphate/molybdate passivation treatment for hot-dip galvanized steel sheet

被引：109

作者：

Tsai, Cheng-Yang ^{[1
]}

Liu, Jen-Shou ^{[1
]}

Chen, Pei-Li ^{[2
]}

Lin, Chao-Sung ^{[1
]}

机构：

[1] Natl Taiwan Univ, Dept Mat Sci & Engn, Taipei 106, Taiwan

[2] China Steel Corp, New Mat R&D Dept, Kaohsiung 802, Taiwan

来源：

CORROSION SCIENCE | 2010年 / 52卷 / 10期

关键词：

Steel; Zinc; EIS; XPS; Polarization; Passive films; CATHODIC ELECTROCHEMICAL TREATMENT; 0.5 M NACL; MOLYBDATE CONVERSION COATINGS; ZINC PHOSPHATE COATINGS; AERATED SULFATE MEDIUM; CORROSION-RESISTANCE; ELECTROGALVANIZED STEEL; PASSIVITY BREAKDOWN; CERIUM(III) NITRATE; ALKALINE STABILITY;

D O I：

10.1016/j.corsci.2010.06.020

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A two-step roll coating passivation treatment employing phosphate followed by molybdate solutions has been performed on hot-dip galvanized (GI) steel sheet. The phosphate coating was primarily porous, amorphous Zn phosphate. A second step coating treatment resulted in more hemispherical Zn phosphate particles and the incorporation of molybdate ions and molybdenum oxide into the existing phosphate coating, giving rise to an improved corrosion resistance. The coating reaction during the second step roll coating treatment and the corrosion protection afforded by the second step molybdate treatment are discussed, with emphases on the comparison with the coating formed via immersion. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：3385 / 3393

页数：9

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