Atmospheric corrosion of Galfan coatings on steel in chloride-rich environments

被引：104

作者：

Zhang, Xian ^{[1
]}

Leygraf, Christofer ^{[1
]}

Wallinder, Inger Odnevall ^{[1
]}

机构：

[1] KTH Royal Inst Technol, Sch Chem Sci & Engn, Div Surface & Corros Sci, SE-10044 Stockholm, Sweden

来源：

CORROSION SCIENCE | 2013年 / 73卷

关键词：

Metal coatings; Zinc; Aluminum; IR spectroscopy; SEM; Atmospheric; corrosion; REFLECTION-ABSORPTION SPECTROSCOPY; LAYERED DOUBLE HYDROXIDES; ZN-AL ALLOYS; IN-SITU; INDUCED ZINC; PRODUCTS; ALUMINUM; MICROSTRUCTURE; RESISTANCE; RUNOFF;

D O I：

10.1016/j.corsci.2013.03.025

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Galfan coatings on steel in laboratory exposures with predeposited NaCl and cyclic wet/dry conditions exhibit nearly the same corrosion products as after 5 years of marine exposure. A general scenario for corrosion product evolution on Galfan in chloride-rich atmospheres is proposed. It includes the initial formation of ZnO, ZnAl2O4 and Al2O3 and subsequent formation of Zn6Al2(OH)(16)CO3 center dot 4H(2)O, and Zn2Al(OH)(6)Cl center dot 2H(2)O and/or Zn5Cl2(OH)(8)center dot H2O. An important phase is Zn6Al2(OH)(16)CO3 center dot 4H(2)O, which largely governs the reduced long-term zinc runoff from Galfan. A clear influence of microstructure could be observed on corrosion initiation in the slightly zinc-richer eta-Zn phase adjacent to the beta-Al phase. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：62 / 71

页数：10

共 67 条

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