研究了热浸纯Zn和Zn-0.05%Ni-0.05%V镀层在350℃下的恒温氧化行为。采用SEM、OM、EDS、XRD等方法分析了镀层氧化前后的表面、截面形貌及相组成。结果表明：Zn-0.05%Ni-0.05%V镀层可以有效地抑制Fe-Zn反应和ζ相层的超厚生长;350℃下氧化150h后,纯Zn和Zn-0.05%Ni-0.05%V镀层由ZnO和FeZn8.87两相组成;各镀层氧化动力学曲线主要为抛物线类型;在氧化过程中,纯Zn镀层形成大量的孔洞,氧化增重速率快,而Zn-0.05%Ni-0.05%V镀层组织较致密,具有更优的抗氧化性能.

This paper deals with the isothermal oxidation behaviors of hot-dipped Zn and Zn-0.05%Ni-0.05%V coatings at 350℃.In the investigation,the surface and section morphologies as well as the phase composition of the coatings before and after the oxidation were analyzed by means of SEM,OM,EDS and XRD.The results show that Zn-0.05%Ni-0.05%V coating effectively restrains the Fe-Zn reaction and the extra-thickness growth of ζ phase,that both the Zn and the Zn-0.05%Ni-0.05%V coatings are composed of ZnO and FeZn8.87 after being oxidized at 350℃ for 150h,that the kinetic curves of isothermal oxidation of the coatings mainly obey the parabolic rate law,and that the Zn coating possesses large oxidation mass gain due to the massive holes in it,while the Zn-0.05%Ni-0.05%V coating is of strong oxidation resistance owing to the formation of dense microstructure.