Microstructure and tribological properties of AlCrFe2Ni2W0.2Mo0.75 high-entropy alloy coating prepared by laser cladding in seawater, NaCl solution and deionized water
Microstructure and tribological properties of AlCrFe2Ni2W0.2Mo0.75 high-entropy alloy coating prepared by laser cladding in seawater, NaCl solution and deionized water
复制标题
海水、NaCl溶液和去离子水中激光熔覆AlCrFe2Ni2W0.2Mo0.75高熵合金涂层的显微组织和摩擦学性能
DOI：
10.1016/j.surfcoat.2020.126214
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发表时间：
2020-10-25
影响因子：
5.4
通讯作者：
Kang, Huijun
中科院分区：
文献类型：
--
作者：
Liang, Hui;Miao, Junwei;Kang, Huijun
海洋工程设备在使用过程中经常受到摩擦学影响，导致海洋材料加速恶化。由此提出了引入高熵合金涂层来保护海洋工程装备的有效策略。据此，设计了一种新型耐磨AlCrFe2Ni2W0.2Mo0.75高熵合金涂层，并通过激光熔覆在Q235钢上沉积。深入研究了相应的显微组织、显微硬度、在人造海水、3.5 wt% NaC1溶液和去离子水中的耐腐蚀性能和摩擦学性能。涂层的微观结构呈编织状，由BCC相和有序B2相组成。其硬度约为630.88 HV，几乎是基体硬度的4.6倍。此外，该涂层在NaCl溶液和海水中表现出比Q235钢基体和SUS304更好的摩擦学性能。而且涂层在海水中的摩擦磨损是所有环境中最温和的。主要是由于Mg(OH)(2)、CaCO3和Ca(OH)(2)的润滑作用，以及在涂层磨损表面形成其他金属氢氧化物和氧化物，隔离和减少磨损和摩擦，导致摩擦系数和磨损率下降。此外，涂层在海水中比Q235基材和SUS304具有更好的耐腐蚀性。这些表明AlCrFe2Ni2W0.2Mo0.75涂层是一种很有前景的海洋工程设备表面防护材料。
Ocean engineering equipment frequently undergoes tribological impacts during service, resulting in an accelerated deterioration of ocean materials. Thus an effective strategy by introducing high entropy alloy coating was proposed to protect ocean engineering equipment. Accordingly, a new wear-resistant AlCrFe2Ni2W0.2Mo0.75 high entropy alloy coating was designed and deposited on Q235 steel by laser cladding. The corresponding microstructure, microhardness, corrosion resistance and tribological properties in artificial seawater, 3.5 wt% NaC1 solution and deionized water were investigated deeply. The microstructure of coating presents a weave-like morphology and consists of BCC and ordered B2 phases. Its hardness is approximately 630.88 HV, which is almost 4.6 times than that of substrate. In addition, the coating exhibits better tribological properties than Q235 steel substrate and SUS304 in NaCl solution and seawater. And the friction and wear of coating in seawater are the mildest among all environments. It is mainly due to the lubrication effect of Mg(OH)(2), CaCO3 and Ca(OH)(2), as well as the formation of other metal hydroxides and oxides on worn surface of coating, which isolates and reduces wear and friction, resulting in a decrease in friction coefficient and wear rate. Besides, the coating has better corrosion resistance than Q235 substrate and SUS304 in seawater. These suggest that the AlCrFe2Ni2W0.2Mo0.75 coating is a promising material for surface protection of ocean engineering equipment.