Effect of SO42- on the corrosion behavior of cerium-based conversion coatings on galvanized steel

被引：46

作者：

Kobayashi, Yasuyuki ^{[1
]}

Fujiwara, Yutaka ^{[1
]}

机构：

[1] Osaka Municipal Tech Res Inst, Dept Elect Mat, Joto Ku, Osaka 5368553, Japan

来源：

ELECTROCHIMICA ACTA | 2006年 / 51卷 / 20期

关键词：

cerium; corrosion protection; conversion coating; sulfate ion; galvanized steel;

D O I：

10.1016/j.electacta.2005.11.043

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The cerium-based conversion coatings on galvanized steel were investigated and the influence of SO42- on the corrosion behavior was evaluated. The coatings were prepared by a simple immersion of galvanized steels in an aqueous solution composed of cerium nitrate and sodium sulfate. The corrosion behavior was studied by means of potentiodynamic polanzation measurements and neutral salt spray tests. The addition Of SO42- to the coating solution considerably improved the corrosion resistance of the conversion coatings. Atomic force microscope observation shows that deposits prepared from the solution with SO42- have smaller crystalline size than those prepared without SO42-. The results of X-ray photoelectron spectroscopy and titration curves demonstrate that SO42- ions are incorporated in the coating during the conversion process. This indicates that SO42- acts as a grain refiner and/or growth inhibitor, thus enhancing the corrosion resistance. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：4236 / 4242

页数：7

共 31 条

[1] Studies of the formation of cerium-rich protective films using x-ray absorption near-edge spectroscopy and rotating disk electrode methods [J].

Aldykiewicz, AJ ;

Davenport, AJ ;

Isaacs, HS .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1996, 143 (01) :147-154

[2] Treatment of zinc surface with cerium(III) nitrate to prevent zinc corrosion in aerated 0.5 M NaCl [J].

Aramaki, K .

CORROSION SCIENCE, 2001, 43 (11) :2201-2215

[3] The inhibition effects of chromate-free, anion inhibitors on corrosion of zinc in aerated 0.5 M NaCl [J].

Aramaki, K .

CORROSION SCIENCE, 2001, 43 (03) :591-604

[4] Growth mechanisms of cerium layers on galvanised steel [J].

Arenas, MA ;

de Damborenea, JJ .

ELECTROCHIMICA ACTA, 2003, 48 (24) :3693-3698

[5] Lanthanide compounds as environmentally-friendly corrosion inhibitors of aluminium alloys:: A review [J].

Bethencourt, M ;

Botana, FJ ;

Calvino, JJ ;

Marcos, M ;

Rodríguez-Chacón, MA .

CORROSION SCIENCE, 1998, 40 (11) :1803-1819

[6] High protective, environmental friendly and short-time developed conversion coatings for aluminium alloys [J].

Bethencourt, M ;

Botana, FJ ;

Cano, MJ ;

Marcos, M .

APPLIED SURFACE SCIENCE, 2002, 189 (1-2) :162-173

[7] Kinetic and mechanistic studies of rare earth-rich protective film formation using in situ ellipsometry [J].

Böhm, S ;

Greef, R ;

McMurray, HN ;

Powell, SM ;

Worsley, DA .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2000, 147 (09) :3286-3293

[8]

BURROUGHS P, 1976, J CHEM SOC DA, V17, P1968

[9]

CHASTAIN J, 1992, HDB XRAY PHOTOELECT

[10] REACTIVE CERIUM(IV) OXIDE POWDERS BY THE HOMOGENEOUS PRECIPITATION METHOD [J].

CHEN, PL ;

CHEN, IW .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1993, 76 (06) :1577-1583

← 1 2 3 4 →