【摘要】 钛合金微弧氧化膜具有优良的综合性能,但过去的研究多针对Ti6Al4V及医用纯钛,且电解液常用硅酸盐和磷酸二氢盐体系,不够全面、系统。为此,以磷酸盐溶液体系在船用TA2表面制备了陶瓷微弧涂层。采用SEM、光学显微镜、X射线衍射仪和显微硬度计对陶瓷膜的表面形貌、截面形貌、氧化层厚度、相结构和显微硬度进行了观察测试,用电子万能材料试验机和数字万用表测定了膜层的结合强度和绝缘性,并用盐雾试验机考察了涂层的耐蚀性。结果表明:随氧化时间的延长,膜层厚度不断增加,氧化60min后膜层厚度可达到20μm以上;陶瓷层主要由金红石TiO2相和锐钛矿TiO2相构成,膜基结合强度达到30MPa以上,膜层绝缘性和耐蚀性良好。更多还原

【Abstract】 Micro-arc oxidation ceramic coating was prepared on the surface of marine TA2 alloy by using aqueous phosphate solution as the electrolyte.The surface and cross-section morphologies as well as oxide layer thickness of the coating were observed and determined using a scanning electron microscope and an optical microscope.The phase composition of the coating was determined using an X-ray diffractometer.The microhardness of the coating was meas-ured.An electronic universal material testing machine and a dig-ital multimeter were performed to examine the bonding strength and insulating performance of the coating,and a salt-spray test system was performed to evaluate the corrosion resistance of the coating.Results indicate that the thickness of ceramic coating in-creases with increasing oxidation time and is about 20 μm for the coating obtained after 60 min of micro-arc oxidation.The micro-arc oxidation ceramic coating was mainly composed of rutile and anatase TiO2 phases and possessed adhesion to substrate of 30 MPa and above,showing good insulating performance and corro-sion resistance.更多还原