As one of the important categories of hot-rolled products, hot-rolled steel plates for automobile applications generally undergo uniform corrosion or localized corrosion according to different environments of manufact...As one of the important categories of hot-rolled products, hot-rolled steel plates for automobile applications generally undergo uniform corrosion or localized corrosion according to different environments of manufacturing, transportation and/or storage of the plates. General corrosion often takes place on the surface of a plate in the exterior part of a package, and only reduces the thickness of the plate and slightly increases the roughness of the surface; however, localized corrosion on the surface of a plate inside the package is likely to result in the formation of pit-like defects on the substrate of the plate, which cannot be removed thoroughly by normal acid pickling or sand blasting, and affects the application of the plate. This research report analyzes the phenomena and characteristics of the rusting behavior of hot- rolled steel plates for automobile applications, and the influencing factors are summaried. The corresponding preventative measures are proposed.展开更多
采用扫描电镜(SEM)、能谱仪(EDS)、X射线衍射(XRD)、腐蚀电化学、失重法等方法研究了X80管线钢内外壁氧化层微观组织对10%HCl酸洗液中酸洗过程的影响。研究表明,内外壁氧化层均由Fe 3 O 4构成的致密高温氧化层和α-FeOOH,γ-FeOOH构成...采用扫描电镜(SEM)、能谱仪(EDS)、X射线衍射(XRD)、腐蚀电化学、失重法等方法研究了X80管线钢内外壁氧化层微观组织对10%HCl酸洗液中酸洗过程的影响。研究表明,内外壁氧化层均由Fe 3 O 4构成的致密高温氧化层和α-FeOOH,γ-FeOOH构成的疏松锈层组成,外壁存在明显凹坑缺陷。在酸洗过程中,内外壁表面疏松锈层优先酸洗,20 s后内外壁高温氧化层露出细微裂缝缺陷,酸液可以渗入裂缝直接与基体发生腐蚀,促进局部高温氧化层剥落,从而加速酸洗,酸洗至60 s时内壁酸洗完成,而外壁凹坑内高温氧化层较厚至90 s时才酸洗完成。展开更多
文摘As one of the important categories of hot-rolled products, hot-rolled steel plates for automobile applications generally undergo uniform corrosion or localized corrosion according to different environments of manufacturing, transportation and/or storage of the plates. General corrosion often takes place on the surface of a plate in the exterior part of a package, and only reduces the thickness of the plate and slightly increases the roughness of the surface; however, localized corrosion on the surface of a plate inside the package is likely to result in the formation of pit-like defects on the substrate of the plate, which cannot be removed thoroughly by normal acid pickling or sand blasting, and affects the application of the plate. This research report analyzes the phenomena and characteristics of the rusting behavior of hot- rolled steel plates for automobile applications, and the influencing factors are summaried. The corresponding preventative measures are proposed.
