Microstructure and Corrosion Resistance of Fe-Based Coatings Prepared by Twin Wires Arc Spraying Process
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inran Lin, Zehua Wang, Pinghua Lin, Jiangbo Cheng, Jingjing Zhang, and Xin Zhang (Submitted February 8, 2013; in revised form August 30, 2013) FeB, FeBSi, and FeNiCrBSiNbW coatings were prepared by twin wires arc spraying process on AISI 1045 steel substrate, and the microstructure and phases were characterized by scanning electron microscope, transmission electron microscope, and x-ray diffraction. The corrosion resistance was investigated by means of electrochemical tests. It was found that FeB coating and FeBSi coating were composed of a-Fe, FeO, and Fe2O3 phases. FeNiCrBSiNbW coating consisted of amorphous phase and a-(Fe, Cr) nanocrystalline phase, with porosity of 1.8%, hardness of 807 Hv0.1 and tensile bonding strength of 52.1 MPa. Three kinds of electrochemical tests were employed to identify the corrosion resistance of the coatings. The results indicated that the FeNiCrBSiNbW coating had a superior corrosion resistance, much better than FeB and FeBSi coatings. It was attributed to the amorphous/nanocrystalline structure and the presence of corrosion-resistant element Cr.
Keywords
amorphous/nanocrystalline coating, corrosion resistance, Fe-based coating, twin wires arc spray
1. Introduction Fe-based amorphous/nanocrystalline alloys are potential candidates for use in many industrial application fields, due to relatively low material cost with high hardness and toughness, good corrosion and wear resistance (Ref 1-3). Several thermal spraying techniques such as plasma spraying (Ref 4-7), high velocity oxygen fuel spraying (Ref 8-11), cold gas dynamic spraying (Ref 12, 13), and twin wires arc spraying (Ref 14-18) were employed to produce Fe-based amorphous or amorphous/nanocrystalline alloy coatings in recent years. Among the thermal spraying techniques, twin wires arc spraying has played an increasingly important role in coating preparation because of its flexibility of operation and capability of preparing coating with much lower costs and higher quality. A large number of researches were conducted on twin wires arc-sprayed Fe-based amorphous alloys coatings.
Jinran Lin, Zehua Wang, Jiangbo Cheng, Jingjing Zhang, and Xin Zhang, Institute of Metals and Protection, College of Mechanics and Materials, Hohai University, 1 Xikang Road, Nanjing 210098, PeopleÕs Republic of China; and Pinghua Lin, Southeast University, Nanjing 211189, PeopleÕs Republic of China. Contact e-mails: [email protected] and [email protected].
Journal of Thermal Spray Technology
Bobzin et al. (Ref 14) studied the wire arc-sprayed FeBbased coatings and found that the adding further elements like Cr, C, Si, Al, and Mg should improve the forming of the amorphous phase. Fu et al. (Ref 15) demonstrated that proper anneal treatment could reduce the porosity and increase the hardness of the arc-sprayed Fe-based amorphous coating significantly, which exhibited a better abrasive wear resistance than arc-sprayed 3Cr13 coating. Zhou et al. (Ref 16) prepared a commercially Fe-based coating (i.e., SHS8000) by twin wires arc spraying. The coating contai
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