干湿交替环境状态对碳钢海洋腐蚀行为的影响  

Influence of Dry-Wet Cycles on the Marine Corrosion Behavior of Carbon Steel

作　　者：张庆普 杨海洋 王佳[4] 杨朝晖[2,3] 杜翠薇 ZHANG Qing-pu;YANG Hai-yang;WANG Jia;YANG Zhao-hui;DU Cui-wei(Institute of Advanced Material and Technology,University of Science and Technology Beijing,Beijing 100083,China;Qingdao NCS Testing&Protection Technology Co.Ltd,Qingdao 266071,China;Qingdao Marine Corrosion Research Institute,Central Iron and Steel Research Institute,Qingdao 266071,China;School of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China)

机构地区：[1]北京科技大学新材料技术研究院,北京100083 [2]青岛钢研纳克检测防护技术有限公司,山东青岛266071 [3]钢铁研究总院青岛海洋腐蚀研究所有限公司,山东青岛266071 [4]中国海洋大学化学化工学院,山东青岛266100

出　　处：《表面技术》2020年第7期222-229,共8页Surface Technology

基　　金：国家自然科学基金(51771057)。

摘　　要：目的研究干湿交替海水环境对碳钢腐蚀速率的影响。方法以青岛小麦岛海域海水为试验介质,使用周期间浸设备,以60 min为一个循环,在浸没/干燥时间分别为10 min/50 min、20 min/40 min、30 min/30 min三种不同干湿比的干湿交替条件下,对碳钢试片和电化学试样分别试验3、7、14、21、28 d后取出。通过失重法和电化学测试方法,研究了腐蚀速率的变化情况,使用X射线衍射仪(XRD)、能量色散谱仪(EDS)和扫描电子显微镜(SEM)分别研究了腐蚀产物成分、腐蚀产物形貌和除锈后的腐蚀形貌。结果失重法和电化学方法表明,碳钢在三种干湿比条件下的腐蚀速率为全浸条件下的3~8倍,且碳钢的腐蚀速率随着干湿比的增大而增大,但是增大的幅度越来越小。随着干湿比的增大,碳钢表面生成的锈层变薄,腐蚀产物中γ-FOOH和氧的含量升高,Fe_3O_4的含量降低。结论干湿交替环境的干湿比越大,对碳钢腐蚀的加速作用越显著,且这一加速作用存在极大值。The work aims to study the effect of dry-wet alternating seawater on corrosion rate of carbon steel.Taking seawater from Xiaomai Island in Qingdao as the test medium,carbon steel specimens and electrochemical specimens were tested for 3,7,14,21 and 28 d respectively by alternating immersion equipment with 60 min as a cycle under the dry-wet alternating conditions of immersion/drying time for 10 min/50 min,20 min/40 min and 30 min/30 min using weekly immersion equipment and then taken out.The change of corrosion rate was studied by weight loss method and electrochemical test method.The components and morphology of corrosion products and the corrosion morphology after removal of corrosion products were studied by X-ray diffraction(XRD),energy dispersion X-ray spectroscopy(EDS)and scanning electron microscopy(SEM).The corrosion rate of carbon steel under alternating dry-wet conditions with three dry-wet ratios was 3~8 times of that under whole immersion condition,and the corrosion rate increased with the increase of dry-wet ratio,but the increase gradually became smaller.With the increase of the dry-wet ratio,the thickness of the rust formed became thinner and the content ofγ-FeOOH and oxygen in the rust layer increased while the content of Fe3O4 decreased.The corrosion rate of carbon steel increases with the increase of dry-wet ratio,and the acceleration effect has a maximum value.

关 键 词：干湿交替 干湿比 碳钢 海洋腐蚀 电化学方法 腐蚀行为 

分 类 号：TG172[金属学及工艺—金属表面处理]