摘要
为解决等离子喷涂陶瓷涂层孔隙率高的问题,将Al2O3-13%TiO2(AT13)粉体与CaO-MgO-Al2O3-SiO2(G)硅酸盐玻璃粉按不同比例混合,采用等离子喷涂技术制备得到AT13、G∶AT13=1∶10(GA-1)、G∶AT13=2∶10(GA-2)、G∶AT13=3∶10(GA-3)这4种涂层,对4种涂层的相组成和微观形貌进行了分析,利用浸泡腐蚀与电化学腐蚀试验分别对涂层耐腐蚀性能进行了研究。结果表明:4种涂层均由α-Al2O3、γ-Al2O3、金红石型TiO2和Al2TiO5相组成;AT13、GA-1、GA-2和GA-3涂层的孔隙率分别为13.2%、11.4%、7.8%和8.8%;在3.5%NaCl溶液中浸泡腐蚀1000 h后,3种GA-X(X=1,2,3)涂层的腐蚀面积与纯AT13涂层相比都有所减小;电化学阻抗(EIS)和动电位极化曲线(PD)结果表明涂层的耐腐蚀性随着玻璃粉的掺入而提高,但玻璃粉掺量不是越高越好,以G∶AT13=2∶10比例掺杂的涂层耐腐蚀性能最优。
In order to reduce the porosity and improve the corrosion resistance of plasma sprayed ceramic coatings,CaO-MgO-Al2O3-SiO2(G)silicate glass powders is doped into commercially used Al2O3-13%TiO2(AT13)powder in different proportions.Thus,AT13,G∶AT13=1∶10(GA-1),G∶AT13=2∶10(GA-2),G∶AT13=3∶10(GA-3)coatings are prepared by plasma spraying.The phases and morphologies of the coating were analyzed,and the corrosion resistance of the coating was studied by immersion corrosion and electrochemical corrosion.It can be concluded that phases compositions of the tested four coatings areα-Al2O3,γ-Al2O3,rutile TiO2 and Al2TiO5;the porosity of coatings are 13.2%(AT13),11.4%(GA-1),7.8%(GA-2)and 8.8%(GA-3),respectively.After 1000 h immersion in 3.5%NaCl solution,the corrosion area of the GA-X(X=1,2,3)coatings are all decreased compared with the pure AT13 coating;the electrochemical impedance(EIS)and kinetic potential polarization curve(PD)results showed that the corrosion resistance of the coatings increased with the increasing amount of the doped glass powder.GA-2 coating got the best corrosion resistance.
作者
张昊
张晶晶
刘旭
林海
李廷举
ZHANG Hao;ZHANG Jingjing;LIU Xu;LIN Hai;LI Tingju(School of Textile and Material Engineering,Dalian Polytechnic University,Dalian 116033,China;School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China;School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《中国表面工程》
EI
CAS
CSCD
北大核心
2020年第3期95-103,共9页
China Surface Engineering
基金
中国博士后科学基金(2017M621128)
大连市支持高层次人才创新创业项目(2017RQ056)
