超音速喷涂Inconel 625/NiCr合金涂层的热腐蚀行为

doi:10.11902/1005.4537.2016.127

中国腐蚀与防护学报

2016, Vol. 36

Issue (5): 483-488 DOI: 10.11902/1005.4537.2016.127

本期目录 | 过刊浏览

超音速喷涂Inconel 625/NiCr合金涂层的热腐蚀行为

杨波¹,李茂东¹,刘光明²(

),汪元奎³,刘康生²,翟伟¹,黄健航²

1. 广州特种承压设备检测研究院广州 510663
2. 南昌航空大学材料科学与工程学院南昌 330063
3. 东方锅炉股份有限公司材料研究所自贡 643001

Hot Corrosion Behavior of Inconel 625/NiCr Coating Prepared by HOVF

Bo YANG¹,Maodong LI¹,Guangming LIU²(

),Yuankui WANG³,Kangsheng LIU²,Wei ZHAI¹,Jianhang HUANG²

1. Guangzhou Special Pressure Equipment Inspection and Research Institute, Guangzhou 510663, China
2. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
3. Material Research Institute, Dongfang Boiler Group Co., Ltd , Zigong 643001, China

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摘要:

采用超音速火焰喷涂在20#钢表面制备了Inconel 625/NiCr合金涂层,研究了涂层表面涂覆NaCl + Na₂SO₄盐膜在700和750 ℃模拟烟气环境中的腐蚀行为。采用XRD,SEM/EDS对喷涂层以及高温腐蚀产物成分、形貌进行分析。结果表明：采用超音速火焰喷涂的625/NiCr涂层结构致密,孔隙率低,涂层中夹杂有金属氧化物;腐蚀动力学表明涂层在700和750 ℃先增重后失重,腐蚀产物有剥落;涂层试样的腐蚀层具有双层结构,外层富Ni而内层富Cr和S,在涂层/基体界面存在少量Cl,长期氧化过程中基体中Fe向涂层扩散。

关键词 ： Inconel, 625/NiCr涂层, NaCl+Na2SO4, 模拟烟气, 热腐蚀

Abstract：

Inconel 625/NiCr coating was prepared on 20# steel substrate by high velocity oxygen fuel spray deposition. Hot corrosion behavior of the Inconel 625/NiCr coated steel beneath a film of mixed salts NaCl+Na₂SO₄ was investigated in simulated flue gas at 700 and 750 ℃ respectively. The microstructure and composition of the spray coating and corrosion products were characterized by scanning electron microscope/energy dispersive spectroscope and X-ray diffraction. The results showed that Inconel 625/NiCr coating prepared by HVOF was dense with low porosity, some oxides were observed in the coating. The samples experienced mass gain at the beginning corrosion stage and subsequently mass loss at 700 and 750 ℃. Spallation of corrosion products on the sample surface was detected. The scale of corrosion products had duplex microstructure, the outer layer was rich in Ni, and the inner layer was rich in Cr and S. A small amount of Cl was detected at the interface of coating and substrate. Fe would diffuse outward from substrate after long time corrosion.

Key words： Inconel 625/NiCr coating NaCl+Na2SO4 simulated flue gas hot corrosion

基金资助:国家自然科学基金项目 (51161022),广州市质量技术监督局科技项目 (2014KJ15) 及江西省教育厅科技计划项目(DB201301133和201301050)资助

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引用本文:

杨波,李茂东,刘光明,汪元奎,刘康生,翟伟,黄健航. 超音速喷涂Inconel 625/NiCr合金涂层的热腐蚀行为[J]. 中国腐蚀与防护学报, 2016, 36(5): 483-488.
Bo YANG, Maodong LI, Guangming LIU, Yuankui WANG, Kangsheng LIU, Wei ZHAI, Jianhang HUANG. Hot Corrosion Behavior of Inconel 625/NiCr Coating Prepared by HOVF. Journal of Chinese Society for Corrosion and protection, 2016, 36(5): 483-488.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.127 或 https://www.jcscp.org/CN/Y2016/V36/I5/483

图1 超音速喷涂Inconel 625/NiCr 复合涂层的表面和截面形貌及对应的EDS结果

图2 Inconel 625/NiCr涂层在700和750 ℃时的腐蚀动力学曲线

图3 Inconel 625/NiCr涂层涂覆盐膜后在700和750 ℃腐蚀后样品表面的XRD谱

图4 Inconel 625/NiCr涂层在700和750 ℃腐蚀后样品表面形貌及对应EDS结果

图5 Inconel 625/NiCr涂层在700与750 ℃腐蚀后样品截面形貌及对应EDS结果

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