不同冷却方式对热轧带钢氧化皮结构及其耐蚀性的影响_图文

1、304Vol.30No.4Aug. 201020108Journal of Chinese Society for Corrosion and Protection1, 211111(1.330063; 2. 330063:EDS XRDFe 2O 3Fe:TG172.313SS400Fe 3O 4(Fe 2O 3:A12Fe 3O 4FeOFe 3O 4+FeNaHSO 3:10054537201004032306SEMNaHSO 3324304:32596hSEM(4c(4a344ba (outerlayer 68.6231.3838.4561.55b (innerlayer71.8428

2、.1642.1657.84mg/ s s o l s s a m 320406080100120 tim e/hFig.3Mass loss of hot rolled strips prepared by dierentcooling methods as a function of corrosion time (1Fig.4Surface morphology of hot rolled strips preparedby dierentcooling methods after 96h dry-wet periodic immersion test(afurnace cooling,

3、(bjar cooling, (cair cooling 32630NaHSO 33.46NyquistBodeBodeair cooling -0.6517.518×105jar cooling -0.6236.531×105furnace cooling-0.5965.521×105Warburg33mc 01/' ' Z 020406080100 Z' /cm-/(e -l g n ae -3s a h p -2-1012345 log f /Hz4. 3. mc 3. |Z 2. |g o l 2. 1. 1. -2-1012345

4、log f /HzFig.6Impedance diagram of SS400hot rolled steels cov-ered by oxide scales prepared by dierentcoolingmethods (aNyquist plots, (bBode plots of phase angle, (cBode plots of log |Z |4:327328 7 Chen R Y, Yuen W Y D. A study of the scale structure of hot-rolled steel strip by simulated coiling an

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13、80 à CO ©µ µ ½¤ ¸, 2009, 21(1: 44-47 2 INFLUENCE OF DIFFERENT COOLING METHODS ON CORROSION RESISTANCE OF OXIDE SCALE STRUCTURE OF HOT ROLLED STRIP ZHOU Xianliang1,2 , ZHU Min1 , HUA Xiaozhen1 , YE Zhiguo1 , CUI Xia1 , ZOU Aihua1 (1. School of Materials Science and

14、Engineering, Nanchang Hangkong University, Nanchang 330063; 2. Key Laboratory of Nondestructive Test, Ministry of Education, Nanchang Hangkong University, Nanchang 330063 Abstract: Dierent structures scales were formed on the surface of SS400 hot rolled strip with dierent cooling methods. Corrosion

15、behaviors of hot rolled strip with dierent oxide scales were investigated in sodium bisulte solution by SEM, EDS, XRD, accelerated cyclic wet-dry immersion corrosion test, polarization curves and electrochemical impedance spectroscopy (EIS. The results showed that three kinds of oxide scales prepare

16、d by dierent cooling methods mainly consisted of Fe3 O4 , as well as a spot of Fe2 O3 and Fe. The content of Fe3 O4 increased with cooling rate reducing, but FeO was not detected. Oxide scale prepared by furnace cooling on the strip consisted of the outer Fe2 O3 layer and the inner Fe3 O4 +Fe layer, and its thickness was more thick and homogeneous than the rest scales. Oxide scale prepared by jar cooling was homogeneous, but that prepared by air cooling h