X70管线钢涂覆渗铝及阳极氧化制备氧化铝涂层试验  

Experiment on preparation of alumina coating on X70 pipeline steel by aluminizing and anodizing

作　　者：贺庆强[1] 庞坤 张帅 孙发哲 许智彬 邹智君 车航 张立军[1] HE Qingqiang;PANG Kun;ZHANG Shuai;SUN Fazhe;XU Zhibin;ZOU Zhijun;CHE Hang;ZHANG Lijun(School of Mechanical and Electrical Engineering,China University of Petroleum(East China),Qingdao 266580,China;Xingmai Innovation Technology(Suzhou)Company Limited,Suzhou 215124,China)

机构地区：[1]中国石油大学(华东)机电工程学院,山东青岛266580 [2]星迈创新科技(苏州)有限公司,江苏苏州215124

出　　处：《中国石油大学学报(自然科学版)》2025年第2期240-246,共7页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：山东省自然科学基金项目(ZR2019MEM038)。

摘　　要：以X70管线钢为研究对象,采用连续涂覆渗铝方法在试样表面制备涂覆铝层,通过双酸复配和缩短氧化时间克服涂层厚度较小的限制,在涂覆铝层外侧形成微孔氧化铝层;通过单因素试验并结合扫描电镜和能谱分析,研究阳极氧化工艺参数对氧化铝层制备的影响,并借助电化学与海水腐蚀试验分析具备不同涂层试样的耐腐蚀性能变化。结果表明:氧化时间3 min、电流密度2.5 A·dm^(-2)、质量浓度30 g·L^(-1)硫酸+100 g·L^(-1)柠檬酸复配水溶液为最佳参数组合;阳极氧化试样耐腐蚀性能比涂覆渗铝试样提升约10%;未涂覆、涂覆渗铝和阳极氧化试样单位表面面积失重为0.38、0.14和0.04 mg·cm^(-2),在涂覆铝层外侧制备氧化铝层可显著提升X70管线钢耐海水腐蚀性能。Taking the X70 pipeline steel as the research object,an aluminum coating was prepared on the surface of the sample by the continuous aluminizing method.The limitation of small coating thickness was overcome by the double acid combination and shortening oxidation time,and a microporous alumina layer was formed on the outside.The influence of anodizing process parameters on the preparation of alumina layer was studied by the single factor experiment combined with the scanning electron microscopy and energy spectrum analysis.The corrosion resistance of samples with different coatings was analyzed by electrochemical and seawater corrosion tests.The results show that the oxidation time of 3 min,the current density of 2.5 A·dm^(-2),the mass concentration of 30 g·L^(-1)sulfuric acid+100 g·L^(-1)citric acid was the best combination of parameters.The corrosion resistance of anodized samples was improved by about 10%compared with that of coated aluminized samples.The weight loss per unit surface area of uncoated,coated aluminized and anodized samples was 0.38,0.14 and 0.04 mg·cm^(-2),respectively.The data shows that the preparation of alumina layer outside the aluminum coating can significantly improve the seawater corrosion resistance of X70 pipeline steel.

关 键 词：X70钢 涂覆渗铝 阳极氧化 耐腐蚀性 

分 类 号：TG156.88[金属学及工艺—热处理]