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

doi:10.11902/1005.4537.2016.127

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

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

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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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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

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	Bo YANG
	Maodong LI
	Guangming LIU
	Yuankui WANG
	Kangsheng LIU
	Wei ZHAI
	Jianhang HUANG

Cite this article:

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.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.127 OR https://www.jcscp.org/EN/Y2016/V36/I5/483

Fig.1 Surface morphologies (a) and cross section (b) of Inconel 625/NiCr coating prepared by HVOF and EDS results of positions 1 (c) and 2 (d) in Fig.1b

Fig.2 Corrosion kinetics of Inconel 625/NiCr coating at 700 and 750 ℃

Fig.3 XRD patterns from the surface of Inconel 625/NiCr coating corroded at 700 and 750 ℃

Fig.4 Surface morphologies (a, b) and EDS results of positions 1 (c) and 2 (d) in Fig.4 of Inconel 625/NiCr coating prepared by HVOF at 700 ℃ (a, c) and 750 ℃ (b, d)

Fig.5 Cross sections (a, b) and EDS results of positions 1 (c), 2 (d), 3 (e), 4 (f), 5 (g) and 6 (h) in Fig.5 of Inconel 625/NiCr coating prepared by HVOF at 700 ℃ and 750 ℃

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