李阳,缪强,梁文萍,林浩,黄朝军,赵子龙,孙自旺.Al/Cr复合涂层对Ti2AlNb合金抗热腐蚀性能的影响[J].表面技术,2020,49(2):192-199.
LI Yang,MIAO Qiang,LIANG Wen-ping,LIN Hao,HUANG Chao-jun,ZHAO Zi-long,SUN Zi-wang.Effect of Al/Cr Composite Coating on Hot Corrosion Resistance of Ti2AlNb Alloy[J].Surface Technology,2020,49(2):192-199
Al/Cr复合涂层对Ti2AlNb合金抗热腐蚀性能的影响
Effect of Al/Cr Composite Coating on Hot Corrosion Resistance of Ti2AlNb Alloy
投稿时间:2019-06-27  修订日期:2020-02-20
DOI:10.16490/j.cnki.issn.1001-3660.2020.02.024
中文关键词:  Al/Cr涂层  Ti2AlNb合金  Na2SO4  热腐蚀  扩散  碱性溶解
英文关键词:Al/Cr coating  Ti2AlNb alloy  Na2SO4  hot corrosion  diffusion  alkaline dissolution
基金项目:国家自然科学基金(51874185)
作者单位
李阳 南京航空航天大学 材料科学与技术学院,南京 211106 
缪强 南京航空航天大学 材料科学与技术学院,南京 211106 
梁文萍 南京航空航天大学 材料科学与技术学院,南京 211106 
林浩 南京航空航天大学 材料科学与技术学院,南京 211106 
黄朝军 南京航空航天大学 材料科学与技术学院,南京 211106 
赵子龙 南京航空航天大学 材料科学与技术学院,南京 211106 
孙自旺 南京航空航天大学 材料科学与技术学院,南京 211106 
AuthorInstitution
LI Yang School of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China 
MIAO Qiang School of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China 
LIANG Wen-ping School of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China 
LIN Hao School of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China 
HUANG Chao-jun School of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China 
ZHAO Zi-long School of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China 
SUN Zi-wang School of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China 
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中文摘要:
      目的 改善Ti2AlNb合金在高温腐蚀盐环境中的耐热腐蚀性能。方法 在Ti2AlNb合金表面通过双层辉光等离子渗铬及磁控溅射镀铝技术制备Al/Cr复合涂层,分析涂层热腐蚀前后的微观形貌和物相组成,并探究涂覆Na2SO4盐膜的试样在不同温度下(750、850、950 ℃)的热腐蚀行为。结果 Al/Cr复合涂层组织均匀致密,且与基体结合良好,厚度约73 μm,由表及里依次由Al沉积层、Al/Cr合金层、Cr沉积层、Cr扩散层四部分组成。经不同温度Na2SO4盐热腐蚀后,Al/Cr复合涂层腐蚀程度均显著小于合金基体。涂层试样经750~850 ℃ Na2SO4盐热腐蚀后质量变化较小,850 ℃腐蚀增重仅0.525 mg/cm2,而经历950 ℃、40 h熔盐热腐蚀后失重达到73.571 mg/cm2,且试样截面出现剥离、脱落现象,Al/Cr复合涂层抵抗热腐蚀能力减弱。结论 具有涂层保护的试样抗热腐蚀性能明显优于合金基体。Al/Cr复合涂层在750~850 ℃ Na2SO4盐环境中具有良好的热腐蚀抗力,而更高温度段(850~950 ℃)的热腐蚀抗力下降。Al/Cr复合涂层在Na2SO4盐环境中良好的抗热腐蚀性得益于涂层中Al、Cr元素氧化形成以Al2O3、Cr2O3为主的混合氧化膜,有效阻碍外界氧气及腐蚀性介质侵入基体。
英文摘要:
      The work aims to improve the hot corrosion resistance of Ti2AlNb alloy in high-temperature corrosion environment. Al/Cr composite coating was designed and fabricated on Ti2AlNb alloy by double-glow plasma chromizing and magnetron sputtering. Morphologies and phase composition of the coating before and after corrosion were analyzed. Meanwhile, the hot corrosion behavior of the coated samples in Na2SO4 was studied at different temperature (750, 850 and 950 ℃). Al/Cr composite coating was uniform and compact, and could be bonded with the substrate well, with the thickness of about 73 μm. This protective coating could be divided into 4 layers, including Al deposition layer, Al/Cr alloy layer, Cr deposition layer and Cr diffusion layer from outer to inner, respectively. After the corrosion test in Na2SO4 at different temperature, the coating had a lower weight loss than the substrate. Under the condition of 750~850 ℃ corrosion test in Na2SO4, the coated sample had a small mass change, and the weight gain was only 0.525 mg/cm2 at 850 ℃. While, the mass loss of the coated sample reached 73.571 mg/cm2 after 950 ℃ molten-salt hot corrosion for 40 h. The cross-section of the sample had obvious spallation, suggesting that the hot corrosion resistance of Al/Cr composite coating was degenerated. The hot corrosion resistance of the samples with Al/Cr coating is better than that of the substrate. Al/Cr composite coating has good corrosion resistance in 750~850 ℃ Na2SO4 salt, while the resistance decreases at higher temperature. The good corrosion resistance of coating in Na2SO4 salt environment is attributed to the formation of mixed oxidation film dominated by Al2O3 and Cr2O3, which effectively prevents the invasion of oxygen and corrosive media from the outside into the substrate.
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