引用本文:黄祖江,李智,蒋智秋,董婉冰,杨文芬,李伟洲.渗铝铌合金的微弧氧化及热腐蚀性能[J].中国表面工程,2017,30(4):45~55
HUANG Zu-jiang,LI Zhi,JIANG Zhi-qiu,DONG Wan-bing,YANG Wen-fen,LI Wei-zhou.Micro-arc Oxidation Process and Hot Corrosion Resistance on Niobium Alloy Prepared by Pack Cementation Aluminizing[J].China Surface Engineering,2017,30(4):45~55
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渗铝铌合金的微弧氧化及热腐蚀性能
黄祖江1, 李智1, 蒋智秋1, 董婉冰1, 杨文芬2, 李伟洲1
1.广西大学 材料科学与工程学院, 南宁 530004;2.南京和畅新材料有限公司, 南京 211803
摘要:
为了优化渗铝铌合金的微弧氧化工艺和了解复合涂层的抗热腐蚀性能，利用粉末包埋渗法在铌合金基体上制备渗铝层，再通过调整微弧氧化电参数以及添加剂Y（NO3）3的含量获得Al2O3陶瓷膜外层，确定最佳工艺参数。以最佳工艺制备复合涂层（MAO-Y/Al/C103），与不含Y（NO3）3制备的MAO/Al/C103进行对比，研究其抗热腐蚀性。结果表明：以微弧氧化膜层的硬度和厚度为主要评价指标，获得最佳参数为电压380 V，频率400 Hz，占空比10%，处理时间30 min。添加Y（NO3）3可获得均匀规则的多孔形貌；含与不含Y（NO3）3制备的试样相结构一致，都由NbAl3和γ-Al2O3相组成。经900 ℃混合熔融盐中热腐蚀50 h，MAO/Al/C103和MAO-Y/Al/C103试样都生成Al2O3和NaNbO3相，其热腐蚀增重量分别为55.71 mg/cm2和45.59 mg/cm2。MAO-Y/Al/C103试样由于在热腐蚀阶段有更多的NaNbO3生成以及微弧氧化微孔大幅减小，表现出更优异的抗热腐性。
关键词:  铌合金  包埋渗铝  微弧氧化  Y(NO3)3  热腐蚀
DOI：10.11933/j.issn.1007-9289.20170219001
分类号:TG174.4
基金项目:国家自然科学基金（51371059，51001032）；广西自然科学基金（2014GXNSFCA118013，2016GXNSFDA380022）；广西高等学校高水平创新团队项目（第二批）
Micro-arc Oxidation Process and Hot Corrosion Resistance on Niobium Alloy Prepared by Pack Cementation Aluminizing
HUANG Zu-jiang1, LI Zhi1, JIANG Zhi-qiu1, DONG Wan-bing1, YANG Wen-fen2, LI Wei-zhou1
1.School of Materials Science and Engineering, Guangxi University, Nanning 530004;2.Nanjing Hechang New Material Corporation Ltd., Nanjing 211803
Abstract:
In order to optimize the micro-arc oxidation (MAO) process of niobium alloy prepared by pack cementation aluminizing, Al2O3 ceramic film was obtained by micro-arc oxidation (MAO) process on aluminizing coating, and MAO electrical parameters and Y(NO3)3 additive were adjusted to get the optimum process parameters. In addition, hot corrosion resistance of the composite coating(MAO-Y/Al/C103) prepared by the optimal process and MAO/Al/C103 without Y(NO3)3 were comparatively investigated. Results indicate that the optimum electrical parameters are voltage 380 V, frequency 400 Hz, duty cycle 10% and processing time 30 min. Adding Y(NO3)3 into electrolyte can obtain uniform porous morphology. The specimens with and without Y(NO3)3 are both composed of NbAl3 and γ-Al2O3 phases. Al2O3 and NaNbO3 phases are formed in the MAO/Al/C103 and MAO-Y/Al/C103 with mass gains are 55.71 mg/cm2 and 45.59 mg/cm2, respectively, after hot corrosion at 900℃ for 50 h. A lot of NaNbO3 forms and MAO micropores decreases dramatically after hot corrosion on the MAO-Y/Al/C103 specimen, exhibiting better hot corrosion resistance.
Key words:  niobium alloy  pack cementation aluminizing  micro-arc oxidation(MAO)  yttrium nitrate  hot corrosion resistance
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