Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (1): 41-51.DOI: 10.1007/s40195-018-0812-7
Special Issue: 2019年腐蚀专辑-2
• Orginal Article • Previous Articles Next Articles
Xu-Liang Shang1, Zhi-Jun Wang1(), Qing-Feng Wu1, Jin-Cheng Wang1, Jun-Jie Li1, Jia-Kang Yu1
Received:
2018-06-07
Revised:
2018-07-31
Online:
2019-01-10
Published:
2019-01-18
Contact:
Wang Zhi-Jun
About author:
Author brief introduction:Dao-Kui Xu Professor of IMR, CAS, and “Young Merit Scholar” of Corrosion Center in the Institute of Metal Research (IMR), Chinese Academy of Sciences (CAS). He achieved Ph.D. degree from IMR, CAS, in 2008, during which he obtained “Chinese Academy of Sciences-BHP Billiton” Scholarship award, “Shi Changxu” Scholarship award and “Zhu-LiYueHua” Excellent Doctorate Student Scholarship of Chinese Academy of Sciences. He worked as a Research Fellow in ARC Center of Excellence, Design of Light Metals, Department of Materials Engineering, Monash University, Australia (2008.10-2011.10). He published more than 60 peer-reviewed scientific papers, attended 20 invited lectures and holds seven patents. His papers were cited more than 1200 times. His research interests mainly include: (1) fatigue behavior and fracture toughness of light metals, such as Mg, Al and Ti alloys; (2) effects of alloying, heat treatment and thermomechanical processes on the microstructural evolution and mechanical improvement of light metals; (3) corrosion, stress corrosion cracking and corrosion fatigue behavior of lightweight alloys; and (4) design of new lightweight alloys with a good balance of properties in terms of mechanical property and corrosion resistance.
Xu-Liang Shang, Zhi-Jun Wang, Qing-Feng Wu, Jin-Cheng Wang, Jun-Jie Li, Jia-Kang Yu. Effect of Mo Addition on Corrosion Behavior of High-Entropy Alloys CoCrFeNiMox in Aqueous Environments[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(1): 41-51.
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Designation | Ecorr (mV vs. RE) | icorr (μA/cm2) | Epp (mV vs. RE) | ipass (μA/cm2) | Eb (mV vs. RE) | Eprot (mV vs. RE) | Erp (mV vs. RE) | ΔE (mV) |
---|---|---|---|---|---|---|---|---|
Mo0.1 | -?263 | 0.381 | -?134 | 38 | 949 | - | -?182 | 1083 |
Mo0.2 | -?131 | 0.072 | -?28 | 16 | 941 | 747 | 184 | 969 |
Mo0.3 | -?257 | 0.766 | -?181 | 50 | 955 | 11 | -?178 | 1136 |
Mo0.4 | -?261 | 0.082 | -?261 | 16 | 948 | 695 | 237 | 1209 |
Mo0.5 | -?261 | 0.738 | -?100 | 24 | 965 | 370 | 63 | 1065 |
Table 1 Electrochemical parameters of CoCrFeNiMox alloys in 3.5 wt% NaCl solution
Designation | Ecorr (mV vs. RE) | icorr (μA/cm2) | Epp (mV vs. RE) | ipass (μA/cm2) | Eb (mV vs. RE) | Eprot (mV vs. RE) | Erp (mV vs. RE) | ΔE (mV) |
---|---|---|---|---|---|---|---|---|
Mo0.1 | -?263 | 0.381 | -?134 | 38 | 949 | - | -?182 | 1083 |
Mo0.2 | -?131 | 0.072 | -?28 | 16 | 941 | 747 | 184 | 969 |
Mo0.3 | -?257 | 0.766 | -?181 | 50 | 955 | 11 | -?178 | 1136 |
Mo0.4 | -?261 | 0.082 | -?261 | 16 | 948 | 695 | 237 | 1209 |
Mo0.5 | -?261 | 0.738 | -?100 | 24 | 965 | 370 | 63 | 1065 |
Fig. 2 SEM images of CoCrFeNiMox alloys in 3.5 wt% NaCl solution: ax?=?0.1; bx?=?0.2; cx?=?0.3; dx?=?0.4; ex?=?0.5; b’-e’ high magnification of Fig. 2b-e, respectively
Fig. 3 LSCM images of CoCrFeNiMox alloys after cyclic polarization in 3.5 wt% NaCl solution: a CoCrFeNiMo0.1, corrosion morphology; b CoCrFeNiMo0.1, topographic map; c CoCrFeNiMo0.3, corrosion morphology; d CoCrFeNiMo0.3, topographic map
Fig. 5 a Bode, b Nyquist plots of CoCrFeNiMox alloys in the 3.5 wt% NaCl solution after different amounts of Mo addition; c, d corresponding equivalent electrical circuits (Z: impedance; Zre: real part of impedance; and Zim: imaginary part of impedance)
Fig. 6 aPotentiodynamic polarization curves of CoCrFeNiMox alloys in 0.5 mol/L H2SO4 solution, b magnification of curves around corrosion potential Ecorr
Designation | Ecorr (mV vs. RE) | icorr (μA/cm2) | Epp (mV vs. RE) | ipass (μA/cm2) | Eb (mV vs. RE) | ΔE (mV) |
---|---|---|---|---|---|---|
Mo0.1 | -?688 | 9.666 | -?638 | 30 | 469 | 1107 |
Mo0.2 | -?682 | 2.926 | -?661 | 9 | 460 | 1121 |
Mo0.3 | -?694 | 8.626 | -?656 | 30 | 453 | 1109 |
Mo0.4 | -?663 | 0.712 | -?576 | 6 | 462 | 1038 |
Mo0.5 | -?632 | 1.526 | -?536 | 12 | 450 | 986 |
Table 2 Electrochemical parameters of CoCrFeNiMox alloys in 0.5 mol/L H2SO4 solution
Designation | Ecorr (mV vs. RE) | icorr (μA/cm2) | Epp (mV vs. RE) | ipass (μA/cm2) | Eb (mV vs. RE) | ΔE (mV) |
---|---|---|---|---|---|---|
Mo0.1 | -?688 | 9.666 | -?638 | 30 | 469 | 1107 |
Mo0.2 | -?682 | 2.926 | -?661 | 9 | 460 | 1121 |
Mo0.3 | -?694 | 8.626 | -?656 | 30 | 453 | 1109 |
Mo0.4 | -?663 | 0.712 | -?576 | 6 | 462 | 1038 |
Mo0.5 | -?632 | 1.526 | -?536 | 12 | 450 | 986 |
Fig. 7 SEM images of CoCrFeNiMox alloys in 0.5 mol/L H2SO4 solution: ax?=?0.1; bx?=?0.2; cx?=?0.3; dx?=?0.4; ex?=?0.5; (c’-e’) high magnification of Fig. 7c-e, respectively
Fig. 8 LSCM images of CoCrFeNiMox alloys after potentiodynamic polarization in 0.5 mol/L H2SO4 solution: a CoCrFeNiMo0.1, corrosion morphology; b CoCrFeNiMo0.1, topographic map; c CoCrFeNiMo0.5, corrosion morphology; d CoCrFeNiMo0.5, topographic map
Potential (mV vs. RE) | Co | Cr | Fe | Ni | Mo |
---|---|---|---|---|---|
-?550 | 8.52 | 44.89 | 8.14 | 6.42 | 32.03 |
-?100 | 8.02 | 35.82 | 11.73 | 6.79 | 37.65 |
350 | 6.18 | 52.24 | 8.44 | 5.27 | 27.87 |
Table 3 Cationic fractions analyzed by XPS for CoCrFeNiMo0.4 potentiostatically polarized for 1 h in 0.5 mol/L H2SO4 solution
Potential (mV vs. RE) | Co | Cr | Fe | Ni | Mo |
---|---|---|---|---|---|
-?550 | 8.52 | 44.89 | 8.14 | 6.42 | 32.03 |
-?100 | 8.02 | 35.82 | 11.73 | 6.79 | 37.65 |
350 | 6.18 | 52.24 | 8.44 | 5.27 | 27.87 |
Voltage (mV vs. RE) | Co2+/Co0 | Cr3+/Cr0 | Fe3+/Fe0 | Ni2+/Ni0 | Mo6+: Mo4+: Mo0 |
---|---|---|---|---|---|
-?550 | 0.34 | 5.38 | 2.94 | 0 | 47.61: 16.59: 35.80 |
-?100 | 0.37 | 6.90 | 1.60 | 0.10 | 48.93: 17.11: 33.96 |
350 | 1.33 | 14.46 | 5.46 | 0.46 | 61.29: 15.54: 23.17 |
Table 4 Summary of ratios for main elements with different oxidation states detected by XPS
Voltage (mV vs. RE) | Co2+/Co0 | Cr3+/Cr0 | Fe3+/Fe0 | Ni2+/Ni0 | Mo6+: Mo4+: Mo0 |
---|---|---|---|---|---|
-?550 | 0.34 | 5.38 | 2.94 | 0 | 47.61: 16.59: 35.80 |
-?100 | 0.37 | 6.90 | 1.60 | 0.10 | 48.93: 17.11: 33.96 |
350 | 1.33 | 14.46 | 5.46 | 0.46 | 61.29: 15.54: 23.17 |
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