Interfacial bonding mechanism and properties of HVOF-sprayed Fe-based amorphous coatings on LA141 magnesium alloy substrate
Interfacial bonding mechanism and properties of HVOF-sprayed Fe-based amorphous coatings on LA141 magnesium alloy substrate
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DOI：
10.1016/j.surfcoat.2021.127801
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发表时间：
2021-10-19
影响因子：
5.4
通讯作者：
Zhang, J. S.
中科院分区：
文献类型：
--
作者：
Sun, Y. J.;Yang, R.;Zhang, J. S.
由于镁锂合金的耐蚀性和耐磨性较差，在使用过程中经常会出现过早失效的现象。为了提高镁锂合金的耐腐蚀性和耐磨性，本研究首先采用高速氧燃料喷涂技术（HVOF）在LA 141镁合金基体上制备了铁基非晶涂层。值得注意的是，通过引入厚度为150 μ m的Ni 60中间层，LA 141合金基体上的铁基非晶涂层的结合强度可达56.9 MPa，这是目前所报道的镁合金上铁基非晶涂层的最高值。结果表明，Fe基非晶涂层/Ni 60和Ni 60/LA 141界面的局部冶金结合以及Fe基非晶涂层的致密性是结合强度提高的主要原因。此外，具有Fe基非晶涂层的LA 141镁合金的耐腐蚀性和耐磨性分别是裸LA 141镁合金基体的34倍和170倍。最后，讨论了铁基非晶涂层在拉伸和磨损过程中的失效机理。该研究为镁锂合金的表面保护提供了一种新的方法。
Due to poor corrosion and wear resistance, Mg-Li alloys often experience the premature failure during their service. In order to improve the corrosion and wear resistance of Mg-Li alloys, Fe-based amorphous coatings were firstly prepared on the LA141 magnesium alloy substrate by high velocity oxygen-fuel spraying technology (HVOF) in this study. It is noticed that by introducing the Ni60 interlayer with the thickness of 150 mu m, the bonding strength of the Fe-based amorphous coating on LA141 alloy substrate can reach 56.9 MPa, which is currently the highest value of Fe-based amorphous coatings on magnesium alloys reported so far. It is found that the improvement of bonding strength is attributed to the localized metallurgical bonding at the interfaces of Fe-based amorphous coating/Ni60 and Ni60/LA141 and the compactness of Fe-based amorphous coatings. Moreover, the corrosion and wear resistance of the LA141 magnesium alloy with the Fe-based amorphous coatings are 34 times and 170 times higher than those of the bare LA141 magnesium alloy substrate, respectively. Finally, the failure mechanisms of the Fe-based amorphous coatings during tension and wear are discussed. This study can provide an alternative method for the surface protection of Mg-Li alloys.