通过加速腐蚀实验研究4种氧化铁皮组织对热轧带钢腐蚀性能的影响.实验结果表明,经过80周期的加速腐蚀后,组织由Fe3O4和FeO构成的氧化铁皮最耐腐蚀.组织由Fe3O4、共析产物(Fe3O4+Fe)构成的氧化铁皮耐腐蚀性能最差.在腐蚀初期,腐蚀产物在氧化铁皮表面的缺陷处优先形核,随后外锈层形成.随着外锈层逐渐长大,在氧化铁皮缺陷处形成的腐蚀产物的体积变大.氧化铁皮缺陷处会形成裂纹并扩展到基体,形成内锈层的腐蚀核.在腐蚀后期,外锈层厚度继续长大,结合面处的腐蚀核长大形成内锈层,这时氧化铁皮失去保护作用.
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