| 摘要: |
| 采用热喷涂激光复合工艺在304不锈钢基体上制备3种CrFeAlTi复合涂层。采用氧化增重法评定涂层和基材抗高温氧化性能；利用光学显微镜(OM)、扫描电子显微镜(SEM/EDS)和X射线衍射仪(XRD)对涂层微观组织结构进行分析，并对涂层耐液态铅铋合金(LBE)腐蚀性能进行研究。结果表明，3种CrFeAlTi复合涂层均具有良好的抗高温氧化性和耐液态铅铋合金腐蚀性，未加入304不锈钢粉末制备的涂层相对更好；750 ℃和850 ℃下氧化3 h后304基材增重量分别为0.70 g/m2和0.88 g/m2，而涂层增重量在850 ℃也仅有0.074 g/m2；450 ℃和550 ℃下腐蚀300 h，Pb元素沿基材表面向内部的扩散深度达到了8 μm和10 μm，而在涂层中几乎无扩散，涂层具有很好的抗腐蚀性，能阻止液态铅铋合金扩散到内部，对基材起到一定的防护作用。 |
| 关键词: 复合涂层 抗高温氧化 铅铋合金 腐蚀性能 |
| DOI：10.11933/j.issn.1007-9289.2015.02.009 |
| 分类号: |
| 基金项目: |
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| High-temperature Oxidation Resistance and Corrosion Resistance of CrFeAlTi Composite Coatings |
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JIANG Yanlin, QIU Changjun, LIU Zan
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a. School of Mechanical Engineering, b. Engineering Training Center, University of South China, Hengyang 421001, Hunan
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| Abstract: |
| Three CrFeAlTi composite coatings were prepared on 304 stainless steel substrate through the combined techniques of thermal spraying and subsequent laser sintering. The oxidation weight increase method was adopted to evaluate the hightemperature oxidation resistance property of the coatings and substrate. The microstructure and the corrosion resistance of the coatings to the liquid leadbismuth eutectic (LBE) alloy were investigated by optical microscopy (OM), scanning electron microscopy (SEM/EDS) and Xray diffraction (XRD). The results show that three CrFeAlTi composite coatings have good high temperature oxidation resistance and corrosion resistance to liquid leadbismuth alloy, among which the one without the addition of 304 stainless steel powder is relatively better. After an oxidation time for 3 h at 750 ℃ and 850 ℃, the mass increment for the 304 substrate are 0.70 g/m2 and 0.88 g/m2 respectively, but for the coating is only 0.074 g/m2 at 850 ℃. This suggests that the high temperature oxidation resistance of the coatings is better than that of the substrate. After an immersion time for 300 h at 450 ℃ and 550 ℃, the diffusion depth of the element Pb reaches about 8 μm and 10 μm for the 304 substrate, which is rarely detected in coatings. The substrate thus has excellent corrosion property, which can prevent the spread of the liquid corrosive media and play a vital role in preventing the corrosion of materials. |
| Key words: composite coatings hightemperature oxidation resistance leadbismuth eutectic alloy(LBE) corrosion property |
