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Journal of Chinese Society for Corrosion and protection  2024, Vol. 44 Issue (6): 1529-1537    DOI: 10.11902/1005.4537.2024.060
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Tribo-corrosion Performance of Atmospheric Plasma Sprayed FeCoCrNiMn High Entropy Alloy Coatings
CAO Fuyang(), WANG Haoquan, JI Qian, DING Hengnan, YUAN Zhizhong, LUO Rui
School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China
Cite this article: 

CAO Fuyang, WANG Haoquan, JI Qian, DING Hengnan, YUAN Zhizhong, LUO Rui. Tribo-corrosion Performance of Atmospheric Plasma Sprayed FeCoCrNiMn High Entropy Alloy Coatings. Journal of Chinese Society for Corrosion and protection, 2024, 44(6): 1529-1537.

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Abstract  

Herein, FeCoCrNiMn high entropy alloy coatings were prepared on 304 stainless steel, using atmospheric plasma spraying technique. The tribo-corrosion behavior of the coating was studied in simulated seawater. Results show that the FeCoCrNiMn high entropy alloy coating was composed of single FCC phase with an average hardness 221.1HV0.2, in contrast, that of the 304 stainless steel is 159.1HV0.2. The tribo-corrosion test results showed that in 3.5%NaCl solution, the wear volumes of FeCoCrNiMn high entropy alloy coating under loads 5 N and 10 N differentiated by 17%, which were 1.21 × 10-2 mm3 and 1.42 × 10-2 mm3 respectively. The main wear mechanism was believed to be corrosive wear and oxidative wear. The wear volumes of the coating under loads 5 N and 10 N in deionized water differentiated by 11%, which were 1.15 × 10-2 mm3 and 1.28 × 10-2 mm3 respectively. The main wear mechanism was also adhesive wear and oxidative wear. The wear volume in NaCl solution higher than in deionized water might suggest that the corrosion effect of NaCl solution promote the wear process. Meanwhile, in NaCl solution, the open circuit potential of the wear samples under lower load could be restored to close to the level before friction motion in a short time during the static soaking stage. However, the open circuit potential of wear samples under higher load increased slowly and was difficult to return to the level before friction motion due to more severe mechanical damage. This phenomenon might indicate that the mechanical damage caused by wear would accelerate the corrosion process.

Key words:  high entropy alloy coating      atmospheric plasma spraying      tribo-corrosion      passivation     
Received:  26 February 2024      32134.14.1005.4537.2024.060
ZTFLH:  TG172  
Fund: Open Fund of Hubei Longzhong Laboratory(2022KF-11);Innovation and Entrepreneurship Plan of Jiangsu Province(1711220035);Startup Fund for Advanced Talents of Jiangsu University(55012-20008)
Corresponding Authors:  CAO Fuyang, E-mail: fuyangcao@ujs.edu.cn

URL: 

https://www.jcscp.org/EN/10.11902/1005.4537.2024.060     OR     https://www.jcscp.org/EN/Y2024/V44/I6/1529

Fig.1  XRD pattern of as-prepared FeCoCrNiMn HEA coating
Fig.2  Cross-sectional images of FeCoCrNiMn HEA coating: (a) low image, (b) high image
RegionFeCoCrNiMnO
Spot154.48-22.1814.438.91-
Spot231.9815.3412.1410.299.6310.6
Spot3-17.71-12.76-69.53
Table 1  EDS determined contents of alloying elements at the points marked in Fig.2b (atomic fraction / %)
Fig.3  Microhardness values of the HEA coating and 304 stainless steel substrate
Fig.4  Open circuit potentials (a) and friction coefficients (b) versus time for FeCoCrNiMn HEA coating under 5 N and 10 N loads in 3.5%NaCl solution and deionized water
Fig.5  Cross-sectional profiles of the wear tracks (a) and wear volumes (b) for FeCoCrNiMn HEA coating in 3.5%NaCl solution and deionized water under 5 N and 10 N loads
Fig.6  Surface morphologies and corresponding EDS element mappings of the wear tracks of FeCoCrNiMn HEA coating after friction test in 3.5%NaCl solution under the loads of 5 N (a) and 10 N (b)
Fig.7  Surface morphologies and corresponding EDS element mappings of the wear tracks of FeCoCrNiMn HEA coating after friction test in deionized water under the loads of 5 N (a) and 10 N (b)
RegionFeCoCrNiMnOSi
Spot13.482.813.692.243.2973.8610.62
Spot23.762.032.142.852.8976.569.77
Spot35.764.726.045.795.1564.887.66
Spot45.024.755.255.973.4668.537.02
Table 2  EDS determined contents of alloying elements at the points marked in Fig.6 and Fig.7
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