| 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。 |
| 关键词: 陶瓷涂层 等离子喷涂 硅酸盐玻璃粉掺杂 电化学腐蚀 |
| DOI：10.11933/j.issn.1007-9289.20191107003 |
| 分类号:TG178 |
| 文章编号:1007-9289(2020)03-0095-09 |
| 文献标识码:A |
| 基金项目: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) |
|
| Corrosion Resistance of Plasma Sprayed G-Al2O3-13% TiO2 Glass-ceramic Composite Coatings |
|
Zhang Hao1,2, Zhang Jingjing1,3, Liu Xu1, Lin Hai1, Li Tingju3
|
|
1.School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116033 , China;2.School of Materials Science and Engineer- ing, Lanzhou University of Technology, Lanzhou 730050 , China;3.School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024 , China
|
| Abstract: |
| 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 propor- tions. 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 stud- ied by immersion corrosion and electrochemical corrosion. It can be concluded that phases compositions of the tested four coat- ings are α-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. |
| Key words: ceramic coating plasma spraying silicate glass doped electrochemical corrosion |
