Abstract
The influence of a partial substitution of Fe with Mischmetal [Ni60RE40 (wt.%), RE: rare earth including Ce; La; Nd and Pr] on the glass formation ability (GFA), mechanical properties and electrochemical corrosion behavior of arc-sprayed AlSiFe-based amorphous coatings has been investigated. It is revealed that partial substitution of Fe by Mischmetal slightly debases the GFA and mechanical properties of the AlSiFe amorphous coating because of the selective oxidation of RE elements. With Mischmetal substitution, the amorphous fraction, onset crystallization temperature and microhardness of the coating decrease to 64.3%, 306 °C, and 338.7 Hv100, respectively. Compared with a crystalline aluminum alloy and coating, the coating with Mischmetal substitution still has a prominent wear and corrosion resistance. The relative wear resistance of the coating with Mischmetal substitution is about 2.5 times than that of the 6061-Al alloy under the same dry sliding testing condition. In 0.6 M NaCl aqueous solution, the coating with Mischmetal substitution manifests a lower Icorr, higher Ecorr and Ep values in polarization curves and bigger fitted Rct value in EIS plots than does the as-sprayed crystalline Al coating.
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Acknowledgments
This project is supported by National Natural Science Foundation of China (Grant No. 51575159), the Fundamental Research Funds for the Central Universities (Grant No. 2018B16914), the Key Research and Development plan of Jiangsu Province, China (Grant No. BE2017065) and the China Scholarship Council (Grant No. 201706715008).
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Liu, Q., Cheng, J., Wang, B. et al. Effects of Substitution of Fe by Mischmetal on Formation and Properties of Arc-Sprayed AlSi-Based Amorphous Coating. J Therm Spray Tech 27, 949–958 (2018). https://doi.org/10.1007/s11666-018-0740-0
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DOI: https://doi.org/10.1007/s11666-018-0740-0