铈离子修饰SiO_(2)膜层在模拟深海条件下的腐蚀行为研究  

Service Behavior of Cerium Ion Modified SiO_(2) Film Prepared by Different Methods in Artificial Deep Sea Environments

作　　者：窦建业 屈少鹏 轩星雨 DOU Jianye;QU Shaopeng;XUAN Xingyu(College of Ocean Science and Engineering,Shanghai Maritime University,Shanghai 201306,China)

机构地区：[1]上海海事大学海洋科学与工程学院,上海201306

出　　处：《中国腐蚀与防护学报》2022年第2期258-266,共9页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(51701115);中国科学院海洋新材料与应用技术重点实验室开放基金(2016K04)。

摘　　要：在X80钢上分别用溶胶-凝胶法和电沉积法制备了铈离子修饰SiO_(2)膜层,并研究了膜层在20 MPa下3.5%NaCl溶液中的腐蚀行为。利用高温高压电化学反应釜对试样的开路电位、电化学阻抗、极化曲线进行了测试,利用扫描电镜、能谱仪、X射线衍射仪、X射线光电子能谱仪以及接触角测试仪对试样腐蚀形貌、腐蚀产物相以及接触角进行了分析。结果显示,两种方法制备的膜层的抗腐蚀性能在深海均有下降,且电沉积膜层下降尤为显著。在20 MPa去离子水中浸泡后的膜层均未出现明显裂纹;在20 MPa盐水中浸泡后,电沉积膜层出现些许开裂,而溶胶-凝胶膜层仍较为完好;在20 MPa盐水中恒电位极化腐蚀后,电沉积膜层出现明显龟裂和脱落,而溶胶-凝胶膜层仅出现开裂。两种膜层腐蚀之前均表现亲水性,而腐蚀后接触角明显增大,呈现出疏水性。Two cerium ion modified SiO_(2)films were prepared on X80 steel by sol-gel method and electrodeposition method respectively,and the corrosion behavior of the two films in 20 MPa,3.5%Na Cl solution was studied.The corrosion behavior of the coated steel was assessed via a high-temperature and high-pressure electrochemical reactor with open circuit potential measurement,polarization curve measurement and electrochemical impedance spectroscopy.Before and after corrosion test,the coated steels were characterized by means of scanning electron microscope,energy disperse spectroscopy,X-ray diffraction,X-ray photoelectron spectroscopy and contact angle tester.The results show that the corrosion resistance of the films prepared by the two methods reduced in the artificial deep sea environment,especially the electrodeposited film;after immersion in 20 MPa deionized water,no obvious cracks appeared on the two films;however,after immersion in 20 MPa salt water,a few cracks emerged on the electrodeposited film,while the sol-gel film was still relatively intact;after potentiostatic polarization in 20 MPa salt water,significant cracking and peeling off could be observed for the electrodeposition film,but only cracking could be seen for the sol-gel film;both films are hydrophilic before corrosion,but the contact angle increases significantly after corrosion,showing hydrophobicity to certain extent.

关 键 词：膜层 溶胶凝胶 电沉积 深海 腐蚀 

分 类 号：TG178[金属学及工艺—金属表面处理]