Influence of Media on Oxidation Film in High Temperature Corrosion of GH3625 Alloy

	Influence of Media on Oxidation Film in High Temperature Corrosion of GH3625 Alloy
	Ma Yuanjun 1,2; Ding Yutain 1,2; Liu Jianjun 1,2; Gao Yubi 1,2; Chen Jianjun 1,2; Wang Xingmao 1,2
刊名	RARE METAL MATERIALS AND ENGINEERING
	2022-05-01
卷号	51 期号:5 页码:1713-1723
关键词	GH3625 alloy high temperature corrosion corrosive medium oxide film corrosion mechanism
ISSN号	1002-185X
英文摘要	The corrosion behavior of as-cast GH3625 alloy were studied in different corrosive media (Air, 75wt%Na2SO4+25wt%NaCl and 2%SO2+H2O+Air) at 900 degrees C for 120 h, utilizing XRD, SEM, EDS, mass-gain measurement and thermodynamic calculation. The formation and destruction mechanism of the oxide film under different corrosive media were discussed. Results show that from the top layer to the internal structure of GH3625 alloy is divided into loose oxide layer, dense oxide layer, Cr poor zone and alloy matrix after corrosion in different media, and the oxide layer is mainly composed of NiO, Cr2O3 and NiCr2O4. In addition, the depth of Cr-poor zone after corrosion in corrosive medium (14 mu m and 11 mu m) is greater than that after oxidation in air (8 mu m). The damage degree of corrosion medium to the surface oxide film of the alloy is molten salt medium, acidic atmosphere medium and air medium in descending order. The corrosion of GH3625 alloy is mainly due to the competition between the formation and dissolution of the surface oxide film in different media. When GH3625 alloy is corroded in 75wt%Na2SO4+25wt%NaCl medium, the corrosion mechanism is mainly that the oxide film reacts with Cl- to form gas phase Cl-2 and reacts with Na2O to form chromate Na2CrO4. However, when GH3625 alloy is corroded in 2%SO2+H2O+Air, the corrosion mechanism is mainly the continuous sulfurization and oxidation reaction of Cr, Ni and SO2, O-2.
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	中文
出版者	NORTHWEST INST NONFERROUS METAL RESEARCH
WOS记录号	WOS:000813756100025
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/158828]
专题	材料科学与工程学院
作者单位	1.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China; 2.Lanzhou Univ Technol, Sch Mat Sci & Engn, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Ma Yuanjun,Ding Yutain,Liu Jianjun,et al. Influence of Media on Oxidation Film in High Temperature Corrosion of GH3625 Alloy[J]. RARE METAL MATERIALS AND ENGINEERING,2022,51(5):1713-1723.
APA	Ma Yuanjun,Ding Yutain,Liu Jianjun,Gao Yubi,Chen Jianjun,&Wang Xingmao.(2022).Influence of Media on Oxidation Film in High Temperature Corrosion of GH3625 Alloy.RARE METAL MATERIALS AND ENGINEERING,51(5),1713-1723.
MLA	Ma Yuanjun,et al."Influence of Media on Oxidation Film in High Temperature Corrosion of GH3625 Alloy".RARE METAL MATERIALS AND ENGINEERING 51.5(2022):1713-1723.