Corrosion Behavior of Inconel 625 Alloy in Na2SO4–K2SO4 at High Temperature

doi:10.1007/978-981-13-5944-6_16

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	Corrosion Behavior of Inconel 625 Alloy in Na2SO4–K2SO4 at High Temperature
	Ma, Yuan-Jun 2; Ding, Yutian 2; Liu, Jian-Jun 2; Gao, Yu-Bi 2; Zhang, Dong 1
	2019
会议日期	July 12, 2018 - July 16, 2018
会议地点	Xiamen, China
关键词	Corrosion rate Corrosive effects Fused salts High temperature corrosion Metallic matrix composites Nickel oxide Potash Sodium sulfate Sulfur compounds Corrosion behavior Corrosion mechanisms Corrosion products Hot corrosion Inconel 625 Inconel 625 alloys Protective oxide layers Thermodynamic calculations
卷号	217
DOI	10.1007/978-981-13-5944-6_16
页码	153-166
英文摘要	The corrosion behavior of Inconel 625 alloy at 800 and 900 °C in the molten salt of 75 wt% Na2SO4–25 wt% K2SO4 was studied. The corrosion mechanism of Inconel 625 alloy after hot corrosion is mainly alkaline melting mechanism. The Cr2O3 on the surface of the alloy dissolved in molten salt as Na2CrO4, leading to the loss of the protective oxide layer on the alloy surface. With the decomposition of Cr2O3 on the surface of the alloy, Cr-depleted region appeared at the interface of the alloy matrix/corrosion layer, which inhibited the growth of the Cr2O3 oxide layer and resulted in the discontinuous oxide layer. This caused O and S to invade the substrate and corrode the alloy matrix. When the alloy was corroded at 800 °C for 120 h, the corrosion rate was about 3 mg/cm2. The corrosion layer was relatively complete, and it mainly consisted of flaky Cr2O3 and spinel-like NiCr2O4. When the alloy was corroded at 900 °C for 120 h, the corrosion rate was about 6 mg/cm2, and obvious shedding and faults appeared in the corrosion layer, which were mainly divided into three layers: the outer layer was composed of NiCr2O4 and NiO; the middle layer was a dense Cr2O3; the inner layer was composed of sulfides (Cr2S3 and Ni3S2), oxides (Cr2O3 and NiO), telluride, etc. Through thermodynamic calculation and analysis, it was found that SO2 decomposed from molten salt under high temperature could cause severe corrosion to the alloy. The main corrosion products were Cr2O3, Cr2S3, NiO, and Ni3S2. © 2019, Springer Nature Singapore Pte Ltd.
会议录	Springer Proceedings in Physics
会议录出版者	Springer Science and Business Media, LLC
语种	英语
ISSN号	09308989
内容类型	会议论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/118033]
专题	省部共建有色金属先进加工与再利用国家重点实验室材料科学与工程学院
作者单位	1.State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization, Jinchuan Group Co., Ltd., Jinchang; 737100, China 2.State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China;
推荐引用方式 GB/T 7714	Ma, Yuan-Jun,Ding, Yutian,Liu, Jian-Jun,et al. Corrosion Behavior of Inconel 625 Alloy in Na2SO4–K2SO4 at High Temperature[C]. 见:. Xiamen, China. July 12, 2018 - July 16, 2018.