静水压对X80表面铈转化膜腐蚀行为的影响  

Influence of Hydrostatic Pressure on Corrosion Behavior of Cerium Conversion Coating on X80

作　　者：屈少鹏 李超 董丽华 尹衍升 杨丽景 QU Shaopeng;LI Chao;DONG Lihua;YIN Yansheng;YANG Lijing(College of Ocean Science and Engineering,Shanghai Maritime University,Shanghai 201306,China;Key Laboratory of Marine Materials and Related Technologies,Ningbo Institute of Materials Technology and Engineering,China Academy of Sciences,Ningbo 315201,China)

机构地区：[1]上海海事大学海洋科学与工程学院,上海201306 [2]中国科学院宁波材料技术与工程研究所中国科学院海洋新材料与应用技术重点实验室,宁波315201

出　　处：《中国表面工程》2019年第5期95-102,共8页China Surface Engineering

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：铈转化膜作为一种环境友好的转化膜,有利提高材料的耐腐蚀性能。采用电化学沉积方法在X80表面制备了铈转化膜,研究了其在0.1和20 MPa静水压3.5%NaCl溶液中的腐蚀行为。通过高温高压在线电化学测试反应釜对开路电位、交流阻抗、线性极化电阻、极化曲线等进行测试,利用扫描电镜、能谱仪及接触角测试仪对腐蚀前后的表面形貌、元素及表面亲水性进行分析。结果表明,X80表面铈转化膜显著提高X80在浅海0.1 MPa静水压中的腐蚀电化学性质,但在深海20 MPa静水压中X80表面铈转化膜的开路电位、线性极化电阻、交流阻抗明显降低,且腐蚀电流密度明显增加;X80表面铈转化膜在深海20 MPa静水压中腐蚀后表面膜存在大量的裂纹,而在浅海0.1 MPa静水压中腐蚀后表面无明显缺陷;X80表面铈转化膜腐蚀前表面表现出亲水性,而腐蚀后表面接触角明显增大,表现为疏水性。Cerium conversion coating as an environmentally friendly conversion film can improve the corrosion resistance of materials. Cerium conversion coating was prepared on X80 by electrochemical deposition, and the corrosion behavior of the coating on X80 in 0.1 MPa and 20 MPa hydrostatic pressure 3.5% NaCl solution was studied. Open circuit potential,electrochemical impedance spectroscopy, linear polarization resistance and polarization curve were carried out by high temperature and high pressure online electrochemical testing autoclave. Scanning electron microscopy, energy disperse spectroscopy and contact angle meter were used to analyze the topography, elements and hydrophilicity of the surface before and after corrosion. Results show that the cerium conversion coating can significantly improve the electrochemical properties of X80 in shallow sea with a hydrostatic pressure of 0.1 MPa, while open circuit potential, linear polarization resistance and electrochemical impedance spectroscopy of cerium conversion coating on X80 obviously decline and corrosion current density increases in deep sea with a hydrostatic pressure of 20 MPa. Cerium conversion coating on X80 has much cracks after corrosion in deep sea with a hydrostatic pressure of 20 MPa, while no obvious defects is found in shallow sea with a hydrostatic pressure of 0.1 MPa. Cerium conversion coating shows hydrophilicity before corrosion, while contact angle increases after corrosion, showing hydrophobicity.

关 键 词：X80 铈转化膜 静水压 深海 腐蚀 

分 类 号：TG174.44[金属学及工艺—金属表面处理]