Simulating Study of Atmospheric Corrosion of Galvanized Steel: Influence of Zinc Rusts on the Formation of β-FeOOH Rust Particles by Aerial Oxidation of Aqueous FeCl2 Solutions
Simulating Study of Atmospheric Corrosion of Galvanized Steel: Influence of Zinc Rusts on the Formation of β-FeOOH Rust Particles by Aerial Oxidation of Aqueous FeCl2 Solutions
复制标题
镀锌钢大气腐蚀模拟研究：锌锈对 FeCl2 水溶液空气氧化形成 β-FeOOH 锈粒的影响
DOI：
10.1021/ie201453q
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发表时间：
2012
影响因子：
4.2
通讯作者：
田中秀和，北澤辰也，畑中渚，石川達雄，中山武典
中科院分区：
文献类型：
--
作者：
H. Tanaka;S. Hiroiwa;T. Ishikawa;T. Nakayama;Takamasa Onoki;Takamasa Onoki;田中秀和，北澤辰也，畑中渚，石川達雄，中山武典
为了模拟镀锌钢在海洋环境中的腐蚀，采用空气氧化法制备了含ZnCl 2的FeCl 2水溶液和氧化锌、羟基氯化锌（Zn 5（OH）8 Cl 2·H2O，ZHC）等锌锈，制备了β-FeOOH颗粒的钢锈。ZnCl 2的加入使β-FeOOH的结晶度和粒径略有降低。产物中含有少量ZnCl 2，而ZnO和ZHC的锌锈明显阻碍了β-FeOOH的结晶和颗粒长大。在大量锌锈存在下，β-FeOOH的生成受到抑制，生成γ-FeOOH和粒径大于β-FeOOH的ZHC。ZHC对β-FeOOH生成的抑制作用顺序为：ZHC> ZnO> ZnCl 2。锌锈的影响归因于锈颗粒的溶解和Zn（II）在β-FeOOH颗粒前体上的吸附而增加溶液pH。ZnCl 2和锌锈的加入也抑制了CO2在产物上的吸附。这些结果意味着在海洋环境中镀锌钢上形成的β-FeOOH锈更加致密，从而提高了耐腐蚀性。然而，大量锌锈颗粒的存在抑制了致密锈层的形成并降低了耐腐蚀能力。
To simulate the corrosion of galvanized steel in a marine zone, steel rust of β-FeOOH particles was prepared by aerial oxidation of aqueous FeCl2solutions containing ZnCl2and zinc rusts such as ZnO and zinc hydroxychloride (Zn5(OH)8Cl2·H2O, ZHC). The crystallinity and particle size of β-FeOOH were slightly decreased by adding the ZnCl2. The produced particles contained a small amount of ZnCl2, while the zinc rusts of ZnO and ZHC markedly impeded the crystallization and particle growth of β-FeOOH. In the presence of a large amount of zinc rusts, the formation of β-FeOOH was suppressed and γ-FeOOH and ZHC of which the particle size was larger than that of β-FeOOH were generated. The inhibitory effect on the formation of β-FeOOH was on order of ZHC ≈ ZnO ≫ ZnCl2. The effect of zinc rusts was ascribed to the increment of solution pH by dissolution of rust particles and adsorption of Zn(II) on a precursor of β-FeOOH particles. The adsorption of CO2on the products was also suppressed by the addition of ZnCl2and zinc rusts. These results imply that the β-FeOOH rust formed on galvanized steel in a marine environment is more compact, leading to improved corrosion resistance. However, existence of a large amount of zinc rust particles inhibits the formation of a compact rust layer and lowers the ability for corrosion resistance.