Effect of Silica Ratio on the Corrosion Behavior of Nano-silica Potassium Silicate Coatings on Aluminum Alloy 2024

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• 作者：H. Bahri (1)
  I. Danaee (1)
  G. R. Rashed (1)
  D. Zaarei (2)
  
  1. Abadan Faculty of Petroleum Engineering ; Petroleum University of Technology ; Abadan ; Iran
  2. Technical Faculty ; South Tehran Branch ; Islamic Azad University ; Tehran ; Iran
  
• 关键词：aluminum 2024 ; corrosion ; nano ; silica ; silicate conversion coatings
• 刊名：Journal of Materials Engineering and Performance
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：24
• 期：2
• 页码：839-847
• 全文大小：1,749 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Characterization and Evaluation Materials
  Materials Science
  Tribology, Corrosion and Coatings
  Quality Control, Reliability, Safety and Risk
  Engineering Design
  
• 出版者：Springer New York
• ISSN：1544-1024

文摘

Nano-silica modified potassium silicate conversion coating was deposited in different nano-silica/potassium silicate ratios on the surface of 2024 aluminum alloy. The corrosion behavior of coatings was studied by electrochemical impedance spectroscopy, current transient, potentiodynamic polarization, and surface techniques. The ratio of nano-silica/potassium silicate was optimized in order to obtain higher corrosion protection. The experimental results indicated that with increasing nano-silica/potassium silicate ratio, the corrosion resistance of aluminum increases. Furthermore, the pitting corrosion probability of potassium silicate conversion coating decreased with increasing silica ratio. This can be related to the size of nano-silica particles and the ability to fill the pores in potassium silicate coating and reinforce the created siloxane bridges.