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| Corrosion Resistance and Hardness of Amorphous Ti-B Based Coatings |
Xiangying XU1,2,Fangfang GE2,Peng LI2,Rui SHU2,Feng HUANG2( ),Moucheng LI1 |
1. Materials Science and Engineering, Shanghai University, Shanghai 200072, China
2. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China |
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Abstract Amorphous Ti-B based coatings with various densities were deposited on various substrates, i.e. Eagle glass, silicon slice and NdFeB alloy respectively, by means of magnetron sputtering, and then their structure, hardness and corrosion resistance were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), nanoindentation tester, and Modulab electrochemical workstation. The results show that the prepared coatings are amorphous with densities varying in a range 4.04, 4.27 and 4.61 g/cm3 through controlling the processing parameter. Their cross-sectional morphologies show that all the coatings are homogeneous, compact and smooth without features of columnar structure existed in the common PVD coatings. The hardness and corrosion resistance of coatings are closely related to their densities. When the coating density is increased by 14.11%, the hardness is enhanced by 49.01% for the coatings deposited on silicon slice, and the corrosion current density is decreased to 1/3 of that of the one with density 4.04 g/cm3, for the coatings deposited on NdFeB. Correspondingly, the hardness and plastic index are 30.1 GPa and 0.48 respectively for the coating with density 4.61 g/cm3 on silicon slice. Meanwhile, all the coatings with various densities can provide corrosion protection for NdFeB substrates. With the increasing coating density the free corrosion potential shifts to the positive direction and the relevant free corrosion current density decreases gradually for the Ti-B coatings on NbFeB, in the contrast, the bare substrate is just the opposite. The coating with density 4.61 g/cm3 on NdFeB exhibits a free corrosion current density 1.34×10-6 A/cm2, about 1/8 of that of NdFeB substrate, and free corrosion potential -0.689 V, 0.220 V nobler than bare substrate in the 3.5% (mass fraction) NaCl solution. It follows that the amorphous and hard Ti-B coatings can provide good protectiveness to the NdFeB alloy in environments such as NaCl solution.
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