具有低自腐蚀电位的AlMgZnSnPbCuMnNi高熵合金的制备及其电化学性能

Preparation and Electrochemical Properties of AlMgZnSnPbCuMnNi High Entropy Alloys with Low Free Corrosion Potentials

设计了一类AlMgZnSnPbCuMnNi系列等摩尔比合金,采用大气造渣保护熔炼方法制备了合金铸锭,铸锭尺寸为Φ10×60mm。采用电化学工作站测定了所制备的等摩尔比合金的电化学性能,采用XRD和SEM分析了合金微观结构。研究表明,从AlMg合金到AlMgZnSnPbCuMnNi合金,随组元数的增加,高熵合金的自腐蚀电位大致呈现先下降后上升的趋势,而自腐蚀电流密度呈现先上升后下降的趋势。在AlMgZnSnPbCuMnNi高熵合金中,尽管AlMgZn的含量远小于传统的牺牲阳极材料,但自腐蚀电位仍低达-1.33V,自腐蚀电流密度也很低,为3.0×10-5A/cm2,均低于目前使用的铝合金与锌合金牺牲阳极材料,为进一步研究开发阳极材料提供了数据支持。

A series of AlMgZnSnPbCuMnNi alloys with Φ10×60mm rods have been prepared by flux melting in the atmosphere.The as-prepared alloys are investigated using electrochemical performance testing,X-ray diffractometry and scanning electron microscopy.With increasing the number of constituent elements from AlMg to AlMgZnSnPbCuMnNi,the free corrosion potential of the alloy decreases firstly and then increases and the free corrosion current density increases firstly and then decreases.The high entropy AlMgZnSnPbCuMnNi alloy has a lower free corrosion potential than the traditional anode material in spite of the contents of Al,Mg and Zn elements of the high entropy alloy are much lower than those of the traditional anode material.The free corrosion potential of the AlMgZnSnPbCuMnNi alloy is lowed to-1.33V,and the free corrosion current density is also lowed to the order of 10-5 magnitude.