A vanadium-based conversion coating as chromate replacement for electrogalvanized steel substrates

作者：Zou Zhongli; Li Ning^*; Li Deyu; Liu Haiping; Mu Songlin

来源：Journal of Alloys and Compounds, 2011, 509(2): 503-507.

DOI：10.1016/j.jallcom.2010.09.080

• Electrogalvanized steel
• Vanadium
• Chemical conversion coating
• Corrosion resistance
• X-ray techniques

The vanadium conversion coating as chromate replacement was prepared on electrogalvanized steel (EG) plates previously treated in a solution mainly composed of vanadate. Corrosion behavior of these EG plates in contact with 3.5% NaCl solution was investigated using potentio-dynamic measurement and electrochemical impedance spectroscopy (EIS) measurement. The morphology and composition of the vanadium conversion coating were studied using scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) in conjunction with argon-ion sputtering. According to the results, the V-treated EG plate shows the best corrosion protection property compared with the untreated and Cr-treated EG plates. The vanadium-rich coating is composed of the closely packed particles. The coating mainly consists of vanadium and oxygen, which mainly exist as V(2)O(5),VO(2), and its hydrates such as V(2)O(5)center dot nH(2)O, VO(OH)(2).

• 出版日期2011-1-12
• 单位哈尔滨工业大学