The corrosion mechanism of Zn-Cu-Tialloy added with La in 3% NaOH solution was investigated by electrochemicaltesting and SEM observation.Polarization curves manifested that the overallcorrosion kinetics of alloys are...The corrosion mechanism of Zn-Cu-Tialloy added with La in 3% NaOH solution was investigated by electrochemicaltesting and SEM observation.Polarization curves manifested that the overallcorrosion kinetics of alloys are under anodic control.The anodic passivation of the Zn-Cu-Tialloy is remarkably improved by the addition of La.Because La can effectively improve the hydrogen evolution/oxygen reduction over-potentialof alloy elements,and the rare earth oxide film plays an important role in insulation that can strengthen the dielectric properties of Zn-Cu-Tialloy,the corrosion resistance of Zn-Cu-Tialloy is made significantly better by adding a trace amount of La.The improvement of corrosion resistance is not positively correlated with the adding amount of La to alloy.The Zn-Cu-Ti-0.5La alloy displays the best corrosion resistance behavior.The corrosion form of the alloys mainly belongs to a selective corrosion and the main solid corrosion products are Zn（OH）_2 and ZnO.展开更多
基金Funded by the State Key Program of National Natural Science Foundation of China(No.U1502274)the Innovation Scientists and Technicians Troop Construction Projects of Henan Province(No.C20150014)+1 种基金the Program for Innovation Research Team(in Science and Technology)in University of Henan Province(No.14IRTSTHN007)the Key Scientific Program of Henan Province(No.16A430004)
文摘The corrosion mechanism of Zn-Cu-Tialloy added with La in 3% NaOH solution was investigated by electrochemicaltesting and SEM observation.Polarization curves manifested that the overallcorrosion kinetics of alloys are under anodic control.The anodic passivation of the Zn-Cu-Tialloy is remarkably improved by the addition of La.Because La can effectively improve the hydrogen evolution/oxygen reduction over-potentialof alloy elements,and the rare earth oxide film plays an important role in insulation that can strengthen the dielectric properties of Zn-Cu-Tialloy,the corrosion resistance of Zn-Cu-Tialloy is made significantly better by adding a trace amount of La.The improvement of corrosion resistance is not positively correlated with the adding amount of La to alloy.The Zn-Cu-Ti-0.5La alloy displays the best corrosion resistance behavior.The corrosion form of the alloys mainly belongs to a selective corrosion and the main solid corrosion products are Zn（OH）_2 and ZnO.
