Hot Corrosion Behaviors of CoCrFeNiTi0.5 High Entropy Alloy in the Mixture Salt of Na2SO4-25%K2SO4 and Na2SO4-25%NaCl at 750°C
Advances in Materials
Volume 8, Issue 3, September 2019, Pages: 120-126
Received: Aug. 7, 2019; Accepted: Aug. 28, 2019; Published: Sep. 10, 2019
Views 38      Downloads 11
Authors
Li Ping, College of Materials Science and Engineering, Dalian University of Technology, Dalian, China
Zhao Jie, College of Materials Science and Engineering, Dalian University of Technology, Dalian, China
Li Tingju, College of Materials Science and Engineering, Dalian University of Technology, Dalian, China
Pang Shengjiao, College of Materials Science and Engineering, Dalian University of Technology, Dalian, China
Article Tools
Follow on us
Abstract
Hot corrosion behaviors of CoCrFeNiTi0.5 high entropy alloy pre-coated various mixture salt in air at 750°C were investigated respectively by using weight change kinetics, X-ray analyses, SEM equipped with EDS and EPMA. The results indicate that CoCrFeNiT0.5 alloy exhibits relatively high corrosion resistance in Na2SO4-25%K2SO4 molten salts. The cross-section is divided into three parts: the oxide scale composed of various oxides, the corrosion affected zones with some micro-pores as well as minor of sulfides and the matrix. The addition of NaCl to Na2SO4 destroys seriously the integrity and compactness of the oxide scale and induces the formation of more micro-pores as well as sulfides in the corrosion affected zone, which accelerates the propagation of hot corrosion. As a result, the alloy suffers from more severe corrosion in Na2SO4-25% NaCl than in Na2SO4-25%K2SO4. Hot corrosion of the alloy in Na2SO4-25%K2SO4 is explained based on the oxidation and the basic fluxing of Cr2O3 in molten Na2SO4. However, hot corrosion process in Na2SO4-25% NaCl is dominated by the interaction of oxidation and chlorination. In addition, the internal sulfidation of Fe and Ni also contributes to hot corrosion of the alloy in both Na2SO4-25%K2SO4 and Na2SO4-25% NaCl mixture salt.
Keywords
High Entropy Alloys (HEAs), Alkali Metal Sulfate, Low Melting Point Eutectic, Sulfidation, Chlorination
To cite this article
Li Ping, Zhao Jie, Li Tingju, Pang Shengjiao, Hot Corrosion Behaviors of CoCrFeNiTi0.5 High Entropy Alloy in the Mixture Salt of Na2SO4-25%K2SO4 and Na2SO4-25%NaCl at 750°C, Advances in Materials. Vol. 8, No. 3, 2019, pp. 120-126. doi: 10.11648/j.am.20190803.14
Copyright
Copyright © 2019 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
References
[1]
Huang Y S, Chen L, Lui H W, Cai M H, Yeh J W. Microstructure, Hardness, Resistivity And Thermal Stability of Sputtered Oxide Films of Alcocrcu0.5 nife High-Entropy Alloy. Mater Sci Eng A. 2007 (457): 77–83.
[2]
Tong C J, Chen M R, Chen S K, Yeh J W, Shun T T, Lin S J, et al. Mechanical Performance Of the Alxcocrcufeni High-Entropy Alloy System With Multiprincipal Elements. Metal Mater Trans A. 2005 (36): 1263–1271.
[3]
Zhou Y J, Zhang Y, Wang Y L, Chen G L. Microstructure And Compressive Properties of Multicomponent Alx (Ti V Cr Mn Fe Co Ni Cu) 100-X High-Entropy Alloys. Mater Sci Eng A. 2007 (454–455): 260–265.
[4]
Wen L H, Kou H C, Li J S, Chang H, Xue X Y, Zhou L. Effect of Aging Temperature On Microstructure and Properties of Alcocrcufeni High-Entropy Alloy. Intermetallics 2009 (17): 266–269.
[5]
Chen Y Y, Hong U T, Shih H C, Yeh J W, Duval T. Electrochemical Kinetics of The High Entropy Alloys in Aqueous Environments – A Comparison with Type 304 Stainless Steel. Corros Sci 2005 (47): 2679–2699.
[6]
Zhang Y, Zhou YJ, Lin JP, Chen GL, Liaw PK. Solid-Solution Phase Formation Rules For Multi-Component Alloys. Adv Eng Mater 2008 (10): 534–538.
[7]
Li C, Li J C, Zhao M, Jiang Q. Effect of Alloying Elements on Microstructure and Properties of Multi-principal Elements High-Entropy Alloys. J Alloys Compd. 2009 (475): 752–757.
[8]
Chen T K, Wong M S, Shun T T, Yeh JW. Nanostructured Nitride Films of Multielement High-Entropy Alloys By Reactive DC Sputtering. Surf Coat Technol. 2005 (200): 1361–1365.
[9]
Li Bao-Yu, PENG Kun, HU Ai-Ping, ZHOU Ling-Ping, ZHU Jia-Jun, LI De-Yi. Structure and Properties of FeCoNiCrCu0.5 Alx High-Entropy Alloy [J]. Trans. Nonferrous Met. Soc. China. 2013, 23 (03): 735-741.
[10]
Yu Y, Xie Fa-Qin, Zhang Tie-Bang, Kou Hong-Chao, HU Rui, LI Jin-Shan. Microstructure Control and Corrosion Properties of AlCoCrFeNiTi0.5 High-Entropy Alloy [J]. Rare Metal Materials And Engineering. 2012, 41 (5): 862-866.
[11]
Eliaz N, Shemesh G, Latanision R. M. Hot Corrosion in Gas Turbine Components. Eng. Fail. Anal. 2002 (9): 31–43.
[12]
Rapp. R. A. Hot Corrosion of Materials: A Fluxing Mechanism. Corros. Sci. 2002 (44): 209–221.
[13]
L. Gurrappa. Hot corrosion of protective coatings. Mater. Manuf. Process. 2000, 15 (5): 761–773.
[14]
Zheng L, Maicang Z, Jianxin D. Hot Corrosion Behavior Of Powder Metallurgy Rene 95 Nickel-Based Superalloy In Molten Nacl–Na2SO4 salts. Mater Design 2011, 32 (4): 1981–1989.
[15]
Lai G Y. High-Temperature Corrosion of Engineering Alloys. Metals Park: American Society For Metals. 1990.154.
[16]
Shinata Y, Takahashi F, Hashiura K. NaCl-Induced Hot Corrosion of Stainless Steels. Mater Sci Eng 1987 (87): 399-405.
[17]
Bani P. Mohanty And David A. Shores. Role of Chlorides in Hot Corrosion of A Cast Fe-Cr-Ni Alloy. Part I: Experimental Studies. Corn Sci., 2004 (46), 2893-2907.
[18]
Bourhis Y, St. John C. Na2SO4 and NaCl induced Hot Corrosion of Six Nickel Base Superalloys. Oxid Metals 1975, 9 (5/6): 507-528.
[19]
Niu Y, Gesmundo F, Viani F, Wu W. The Corrosion of Ni3Al in a Combustion Gas With and Without Na2SO4-NaCl Deposits At 600–800°C. Oxide Metals. 1994, 42 (5): 393-408.
[20]
Johnson D M, Whittle D P, Stringer J. Mechanisms Of Na2SO4-Induced Accelerated Oxidation. Corrosion Sci 1975, 15 (6-12): 721-739.
[21]
LIU G, Li M, ZHOU Y,ZHANG Y. Influence of Pre-Oxidation on The Hot Corrosion Of Ti3SiC2 iIn the Mixture of Na2SO4-NaCl Melts [J]. Corrosion Science, 2006, 48 (3): 650−661.
[22]
Shi L Q. On the possibility of a Na2SO4-Na2O eutectic melt developing on metals coated with Na2SO4 deposit in oxygen/air at intermediate temperatures. Corrosion Science [J].1995, 37 (8): 1281-1287.
[23]
Fang W C, Rapp R A. Electrochemical reaction in a pure Na2SO4 melt [J]. J. Electrochem. Soc. 1983, 130 (12): 2335-2341.
[24]
Pavlet Knutsson, Haiping Lai, Krystyna Stiller. A method for investigation of hot corrosion by gaseous Na2SO4 Corrosion Science. Corrosion Science [J]. 2013, 73 (2): 230-236.
[25]
Bao Xinhua. Study And Application Of Intelligent Database Of Phase Diagram Of Molten Salt Systems [D]. Shanghai: Shanghai University, 2005.
[26]
DEB D, RAMAKRISHNA IYER S, RADHAKRISHNAN V M. a Comparative Study of Oxidation and Hot Corrosion of a Cast Nickel Base Super-Alloy in Different Corrosive Environments [J]. Materials Letters. 1996, 29 (1/3): 19−23.
[27]
A. U. Seybolt. Internal oxidation in heat-resisting stainless steels caused by presence of halides. Oxid. Met. 2 (1970) 161-171.
[28]
Y. Shinata, Accelerated oxidation rate of chromium induced by sodium chloride. Oxid. Met. 1987, 27 (5/6): 315-322.
[29]
Knacke O, Kubaschewski O, Hesselmann K. Thermomechanical Properties of Inorganic Substance. Berlin, Heidelberg: Springer-Verlag. 1991.
[30]
O. Knacke, O. Kubaschewski, K. Hesselmann. Thermochemical Properties of Inorganic Substance. Springer-Verlag, Berlin, Heidelberg, 1991.
[31]
G. Y. Lai, High-Temperature Corrosion Of Engineering Alloys. American Society For Metals, Metals Park, OH, 1990, 154.
[32]
W. C. Fang, R. A. Rapp. Electrochemical reaction in a pure Na2SO4 melt. J. Electro-chem. Soc. 130 (1983): 2335-2341.
[33]
W. J. Li, Y. Liu, Y. Wang, C. Han, H. P. Tang. Hot Corrosion Behavior of Ni–16Cr–XAl Based Alloys in Mixture of Na2SO4−NaCl at 600°C [J]. Trans. Nonferrous. Met. Soc. China. 2011 (21): 2617-2625.
ADDRESS
Science Publishing Group
1 Rockefeller Plaza,
10th and 11th Floors,
New York, NY 10020
U.S.A.
Tel: (001)347-983-5186