Effect of Hot-Rolled Oxide Scale on Dry/ Wet Cyclic Corrosion Behavior of Q370qNH Steel in Simulated Industrial Atmosphere Environment  

作　　者：REN Yuxia GUO Tieming XU Xiujie LI Guangming TANG Jian NAN Xueli JIA Jiangang 任玉霞;郭铁明;XU Xiujie;LI Guangming;TANG Jian;NAN Xueli;JIA Jiangang(State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Gansu Province Transportation Planning,Surveydesign Institute Co.,Ltd,Lanzhou 730050,China)

机构地区：[1]State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China [2]School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China [3]Gansu Province Transportation Planning,Surveydesign Institute Co.,Ltd,Lanzhou 730050,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2022年第6期1216-1227,共12页武汉理工大学学报（材料科学英文版）

基　　金：by the National Natural Science Fundation of China(No.52161007);the Science and Technology Project of Gansu Provincial Department of Transportation(No.202102);the Natural Science Foundation of Gansu Province(No.20JR10RA170)。

摘　　要：The corrosion behavior of Q370qNH steel in the presence and absence of hot-rolled oxide scale in simulated industrial atmospheric environment was studied by dry/wet cycle accelerated corrosion experiments.The experimental results show that the corrosion type of bare steel is uneven overall corrosion and large size pitting corrosion in small areas;that of oxide scale sample is local dissolution corrosion and small size pitting corrosion in large areas,and corrosion rate is much smaller than that of bare steel.The corrosion products of both steels are composed ofα-FeOOH,γ-FeOOH,Fe_(2)O_(3),and Fe_(3)O_(4),but the formation mechanism is different.The bare steel generatesα-FeOOH andγ-FeOOH through“acid regeneration cycle mechanism”;the oxide scale sample generates hydroxides mainly through the gradual dissolution of the oxide film,and then through“the acid regeneration cycle mechanism”.With the extension of corrosion time,the electrochemical stability of the sample with oxide scale increases,but the change of tafel curve of bare steel sample is not obvious.In simulated industrial atmosphere,the existence of hot-rolled oxide scale can facilitate the formation of dense rust layer on the surface of Q370qNH steel,which is more protective than bare steel.

关 键 词：Q370qNH steel oxide scale NAHSO3 corrosion behavior 

分 类 号：TG174.3[金属学及工艺—金属表面处理]