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Acta Metall Sin  2015, Vol. 51 Issue (1): 49-56    DOI: 10.11900/0412.1961.2014.00272
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PASSIVATION BEHAVIOR OF Fe-BASED AMORPHOUS METALLIC COATING IN NaCl AND H2SO4 SOLUTIONS
WANG Yong1, 2, ZHENG Yugui3, WANG Jianqiang4, LI Meiling5, SHEN Jun1
1 School of Materials Science and Engineering, Tongji University, Shanghai 201084; 2 School of Mechanical Science and Engineering, Northeast Petroleum University, Daqing 163318; 3 Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016; 4 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016; 5 Physics Department, Anshan Normal College, Anshan 114001
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Abstract  Amorphous alloy is a new type of material that exhibits exceptional properties or combinations of properties that are often not achievable in conventional crystalline materials. Fe-based amorphous alloys has attracted significant attention over the last few decades because of their low cost and enhanced mechanical performance. However, they are more suitable for the industrial application of coatings due to the fatal disadvantages of poor toughness. High velocity oxygen-fuel (HVOF) spraying is a good way to make amorphous alloy coatings (AMCs), for the individual droplets are cooled at a rate of around 107 K/s which is much higher than the critical cooling rate of the amorphous alloys during the thermal spraying. Fe-based AMCs obtained by using the HVOF spray method are important materials for industrial applications because of high glass-forming ability and exceptional performances, such as excellent corrosion resistance, high hardness, and superior wear resistance. In this work, FeCrMoMnWBCSi AMCs were prepared by HVOF thermal spray. The microstructure and amorphous characteristics of AMCs were characterized by SEM and XRD. Electrochemical corrosion behavior of AMCs was investigated in different concentration of NaCl and H2SO4 solutions compared with that of 304 stainless steel and ND steel. The surface film of materials after immersed in two solutions was analysed by XPS. The results indicated that HVOF thermal spraying Fe-based AMCs presented dense layered structure, high amorphous phase content and low porosity. The composite structure of AMCs was formed with some nanocrystallite phases embedded in the amorphous matrix. AMCs exhibited better resistance to pitting corrosion and relatively low uniform corrosion resistance due to the porosity, while the pitting potential of 304 stainless steel was sensitive to NaCl concentration. XPS results revealed that the presence of Cr, Mo and W oxides in the passive film of AMCs may result in the better corrosion resistance. The enrichment of Mo4+ oxides on the surface favored the formation of a more stable and protective layer which could be assumed to be responsible for the observed high stability of passive film. The diminishing or avording pores may be beneficial to further improve the pitting corrosion resistance of AMCs in NaCl solution. In all cases, AMCs showed better resistance to H2SO4 solutions corrosion due to the high stability of passive film. 304 stainless steel and ND steel presented stable passivation behavior only in high concentration of H2SO4 solution. In the lower concentration solution of H2SO4, the amorphous structure of the thinner coatings could facilitate the formation of thicker passivation film and lead to the higher corrosion resistance. The corrosion resistance of AMCs in H2SO4 solution could be enhanced significantly by formation of high amorphous phase.
Key words:  amorphous metallic coating (AMC)      high-velocity oxygen-fuel (HVOF)      passivation      electrochemical corrosion     
ZTFLH:  TG174  
Fund: ; Supported by National Natural Science Foundation of China (Nos.51274151 and 51025415), China Postdoctoral Science Foundation (No.2014M551447), Natural Science Foundation of Heilongjiang Province (No.QC2013C056), Science and Technology Research Projects of Heilongjiang Province Education Department (No.12541079)
Corresponding Authors:  Correspondent: SHEN Jun, professor, Tel: (021)69581009, E-mail: junshen@tongji.edu.cn     E-mail:  junshen@tongji.edu.cn

Cite this article: 

WANG Yong, ZHENG Yugui, WANG Jianqiang, LI Meiling, SHEN Jun. PASSIVATION BEHAVIOR OF Fe-BASED AMORPHOUS METALLIC COATING IN NaCl AND H2SO4 SOLUTIONS. Acta Metall Sin, 2015, 51(1): 49-56.

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00272     OR     https://www.ams.org.cn/EN/Y2015/V51/I1/49

Fig.1  

DSC curves for the as-quenched Fe54.2Cr18.3Mo13.7-Mn2.0W6.0B3.3C1.1Si1.4 amorphous ribbon and amorphous metallic coatings (AMCs) (AMCs1 and AMCs2 represent the coatings with thickness of 200 and 400 μm, respectively; Tg—glass transition temperature, Tx—crystallization temperature)

Fig.2  

XRD spectra for the as-quenched Fe54.2Cr18.3Mo13.7-Mn2.0W6.0 B3.3C1.1Si1.4 amorphous ribbon, AMCs1 and AMCs2

Fig.3  

SEM images of as-sprayed surfaces (a, d), polished surfaces (b, e) and cross-section (c, f) of AMCs1 (a, b, c) and AMCs2 (d, e, f)

Fig.4  

Potentiodynamic polarization curves (a, c) and EIS plots (b, d) of amorphous ribbon, AMCs and 304 stainless steel in 1%NaCl (a, b) and 3%NaCl (c, d) solutions (E—potential, i—current density, ZRe—real part of impedance, ZIm—imaginative part of impedance)

Fig.5  

Potentiodynamic polarization curves (a, c) and EIS plots (b, d) of amorphous ribbon, AMCs, 304 stainless steel and ND steel in 20%H2SO4 (a, b) and 50%H2SO4 (c, d) solutions

Fig.6  

Full survey (a, b) and Cu, Mo high resolution (c, d) XPS spectra of passive film on AMCs1, 304 stainless steel and ND steel formed in in 1%NaCl (a, c) and 20%H2SO4 (b, d) solutions for 10 h

Fig.7  

Depth profiles of alloying components in the surface layer of AMCs1 (a, c) and AMCs2 (b, d) in 20%H2SO4 (a, b) and 50%H2SO4 (c, d) solutions (O/M—oxide/metal)

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