Elucidation of Enhancement Mechanism of Resistance to Corrosion of Galvanized Steel by Artificial Zinc Rusts

本研究旨在定性和定量地阐明人工锌锈的形成、结构和形态与镀锌钢表面锌锈的密度、反应性和稳定性之间的关系。详细情况总结如下。(1)在各种大气腐蚀性气体中，SO_x是对碱性锌盐（BZS）在镀锌钢上形成锌锈蚀最有效的腐蚀性气体，形成羟基硫酸锌锈蚀。(2)添加Ti（IV）抑制了BZS锌锈的结晶、颗粒生长和H_2O、CO_2等腐蚀性气体的吸附。(3)镀锌钢腐蚀后期，铁（III）对锌锈BZS的形成、颗粒形态和腐蚀性气体的吸附有强烈的影响，铁（III）对锌锈BZS的形成、颗粒形态和腐蚀性气体的吸附有强烈的影响。-FeOOH受锌锈颗粒影响较大。

This study was aim to qualitatively and quantitatively clarify the relation between formation, structure and morphology of artificial zinc rusts and density, reactivity, stability of zinc rusts on galvanized steel. The details were summarized as follows.(1) Among various atmospheric corrosive gasses SO_x is the most effective corrosive gas on the formation of zinc rusts of basic zinc salt (BZS) on galvanized steel to form zinc hydroxysulfate rust.(2) Adding the Ti(IV) inhibited the crystallization, particle growth and adsorption of corrosive gasses such as H_2O and CO_2 of zinc rust of BZS.(3) At later stage of corrosion of galvanized steel, formation, particle morphology and adsorption of corrosive gases of zinc rust BZS strongly were strongly influenced by Fe(III) eluted from steel and those of steel rust ?-FeOOH were considerably effected by zinc rust particles.