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金属学报  2019, Vol. 55 Issue (2): 229-237    DOI: 10.11900/0412.1961.2018.00293
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TiAl合金表面搪瓷基复合涂层与多弧离子镀NiCrAlY涂层的抗热腐蚀行为对比研究
廖依敏1, 丰敏1, 陈明辉1(), 耿哲2, 刘阳3, 王福会1, 朱圣龙3
1 东北大学沈阳材料科学国家研究中心东北大学联合研究分部 沈阳 110819
2苏州工业职业技术学院精密制造工程系 苏州 215104
3 中国科学院金属研究所 沈阳 110016
Comparative Study of Hot Corrosion Behavior of theEnamel Based Composite Coatings and the ArcIon Plating NiCrAlY on TiAl Alloy
Yimin LIAO1, Min FENG1, Minghui CHEN1(), Zhe GENG2, Yang LIU3, Fuhui WANG1, Shenglong ZHU3
1 Shenyang National Key Laboratory for Materials Science, Northeasten University, Shenyang 110819, China
2 Department of Precision Manufacturing Engineering, Suzhou Institute of Industrial Technology, Suzhou 215104, China
3 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
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摘要: 

以Ti-45Al-2Mn-2Nb合金为基体,采用多弧离子镀制备NiCrAlY涂层、喷涂-烧结法制备搪瓷基复合涂层,对比研究了2种涂层以及合金基体的热腐蚀行为。热腐蚀实验温度为850 ℃,选用饱和盐溶液溶质成分为75%Na2SO4+25%NaCl (质量分数),涂盐量为1.5~2.5 mg/cm2。研究结果表明,合金基体完全不具备抗热腐蚀能力,表面形成的氧化膜疏松多孔,且极易剥落;NiCrAlY涂层表面生成的保护性Al2O3膜提高了合金的抗热腐蚀能力,然而涂层与基体间严重的互扩散及Al2O3膜与熔盐的碱性溶解使得NiCrAlY涂层逐渐失效,热腐蚀60 h即出现氧化膜的剥落;而搪瓷基复合涂层在熔盐环境中只发生了轻微的物理溶解,具有极高的热稳定性及较低的热腐蚀速率,有效地阻隔了腐蚀性离子的入侵,抗热腐蚀性能优异。

关键词 搪瓷涂层热腐蚀NiCrAlY涂层TiAl合金    
Abstract

TiAl intermetallic alloys have attracted great attention for its potential application in preparing low pressure turbine blades in aircraft engine. However, its poor oxidation and corrosion resistance becomes a challenge at temperatures above 800 ℃, which leads to the developing of protective coatings. Enamel coating is considered as one of the candidates that match the TiAl alloy well, meanwhile provide corrosion protection. Enamel coating has many advantages such as high thermochemical stability, adjustable thermal expansion coefficient and simple preparation process. This study comparatively investigates hot corrosion behavior of the Ti-45Al-2Mn-2Nb alloy, the traditional NiCrAlY coating and the enamel based composite coating in (75%Na2SO4+25%NaCl, mass fraction) melted salt. Results indicate that after 80 h of hot corrosion, the bare alloy has completely destroyed. For the NiCrAlY coating, it protects the underlying alloy well by forming a protective Al2O3 scale initially. However, serious interdiffusion between coating and substrate results in the degeneration of the coating as well as the scale. At the same time, the basic dissolution of Al2O3 film accelerates corrosion. So obvious spallation takes place after 60 h corrosion. The enamel based composite coating shows excellent thermal stability and low corrosion rate. During the whole hot corrosion test, it still retains its original blue glazing color and luster. Furthermore, the enamel coating suppresses the inward diffusion of oxygen and corrosive ions into the alloy substrate, and thus, it protects the TiAl alloy well from corrosion of the molten (75%Na2SO4+25%NaCl, mass fraction) salt.

Key wordsenamel coating    hot corrosion    NiCrAlY coating    TiAl alloy
收稿日期: 2018-07-01      出版日期: 2018-08-27
ZTFLH:  TG174.4  
基金资助:资助项目 国家自然科学基金项目No.51471177和No.51871051,中央高校基本科研业务费专项基金项目No.N160205001,江苏省自然科学基金青年项目No.BK20160353,以及江苏省高校自然科学研究面上项目No.16KJB460032
作者简介:

作者简介 廖依敏,女,1995年生,硕士生

引用本文:

廖依敏, 丰敏, 陈明辉, 耿哲, 刘阳, 王福会, 朱圣龙. TiAl合金表面搪瓷基复合涂层与多弧离子镀NiCrAlY涂层的抗热腐蚀行为对比研究[J]. 金属学报, 2019, 55(2): 229-237.
Yimin LIAO, Min FENG, Minghui CHEN, Zhe GENG, Yang LIU, Fuhui WANG, Shenglong ZHU. Comparative Study of Hot Corrosion Behavior of theEnamel Based Composite Coatings and the ArcIon Plating NiCrAlY on TiAl Alloy. Acta Metall Sin, 2019, 55(2): 229-237.

链接本文:

http://www.ams.org.cn/CN/10.11900/0412.1961.2018.00293      或      http://www.ams.org.cn/CN/Y2019/V55/I2/229

图1  TiAl合金基体、NiCrAlY涂层和搪瓷基复合涂层在850 ℃下的热腐蚀动力学曲线
图2  TiAl合金基体、NiCrAlY涂层和搪瓷基复合涂层在850 ℃下热腐蚀不同时间后的宏观照片
图3  搪瓷基复合涂层850 ℃下的热腐蚀动力学曲线
图4  TiAl合金基体、NiCrAlY涂层和搪瓷基复合涂层制备态及850 ℃下热腐蚀后的XRD谱
图5  TiAl合金基体、NiCrAlY涂层以及搪瓷基复合涂层在850 ℃下分别热腐蚀80 h (基体样品)及180 h (带涂层样品)后的表面微观形貌
Position O Al Si Ti Mn Nb
a 16.65 3.31 28.74 48.01 2.93 0.36
b 62.66 26.32 2.82 7.95 0.25 -
表1  图6f中a和b点EDS分析结果
图6  TiAl合金基体、NiCrAlY涂层以及搪瓷基复合涂层在850 ℃分别热腐蚀80 h (基体样品)及180 h (带涂层样品) 后的截面微观形貌
图7  制备有NiCrAlY涂层及搪瓷基复合涂层的TiAl合金在850 ℃下热腐蚀180 h后的截面成分EDS分析
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