| 摘要: |
| 通过一次涂搪法在 Q235 低碳钢表面制备出 700 ~ 900 ℃ 烧结的搪瓷涂层。 采用 XRD、SEM、EDS、显微维氏硬度计、落球装置及电化学工作站研究了涂层物相组成、组织形貌、微区成分、机械性能及腐蚀行为。 结果表明:搪瓷涂层在烧结过程中表面孔隙率持续减小,截面孔隙率则先减小后增大再减小;磨加物石英逐渐溶解在涂层硅氧四面体 [SiO4 ]网络中,使涂层显微硬度和光泽度提高;涂层与基体界面处氧化层逐渐减小并最终消失,而 Fe 扩散区逐渐扩大并形成富含 Fe-Co 和 Fe-Ni 枝晶的密着层;涂层表面釉质层形成及内部腐蚀通道的闭合使其耐腐蚀性能显著提高。 |
| 关键词: 烧结温度 孔隙率 界面氧化层 富 Fe 枝晶 |
| DOI：10.11933/j.issn.1007-9289.20190629001 |
| 分类号:TG174.4 |
| 文章编号:1007-9289(2020)04-0160-09 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51674130)；国家重点研发计划国际科技合作项目(2016YFE0111400)；甘肃省国际科技合作特派员计划 (17JR7WA017)；甘肃省重点研发计划项目(17YF1WA159) |
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| Effects of Sintering Temperature on Microstructure and Properties of Enamel Coatings on Q235 Steel |
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LI Cuixia1, QU Xuewei1, LI Wensheng1, FENG Li1, ELENA Yatsenko1,2, YANG Xiaoyong1
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1.State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050 , China;2.Department of General Chemistry and Technology of Silicates Platov South-Russian State Polytechnic University (NPI), Novocherkassk 346428 , Russia
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| Abstract: |
| The enamel coatings sintered at 700-900 ℃ were prepared on the surface of Q235 low carbon steel by one-time coating enamel method. Phase composition, morphology, micro-area composition, mechanical properties and corrosion behavior of enamel coatings were investigated by XRD, SEM, EDS, micro Vickers hardness tester, ball dropping device and electrochem- ical workstation. Results show that the surface porosity decreases gradually, while the cross-section porosity decreases at first, then increases and final decreases during the sintering process. The grinding additive quartz dissolves gradually in the silicon-ox- ygen tetrahedron [SiO4 ] network of the coating, which improves the micro-hardness and gloss of coating. The oxide layer at the interface between coating and matrix decreases and disappears eventually, while the diffusion zone of Fe enlarges gradually, and a dendrite-rich of Fe-Co and Fe-Ni dendrite layer is formed. The formation of enamel layer and the closure of internal corrosive channels of the coating significantly improve the corrosion resistance. |
| Key words: sintering temperature porosity interfacial oxide layer Fe-rich dendrite |
