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Corrosion resistance of nanosilicasilicate conversion coatings on aluminum prepared by the dip immersion method

  • Hamed Bahri , Iman Danaee and Gholam Reza Rashed
Published/Copyright: April 21, 2015
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Abstract

Nanosilica modified potassium silicate conversion coatings were deposited on the surface of 2024 aluminum alloy by the dip immersion method, and the effect of the immersion time was studied on anticorrosion behavior of coatings. The corrosion behavior of coatings was examined by means of electrochemical impedance spectroscopy, potentiodynamic polarization and surface analyzing techniques. The coated samples showed a significant decrease in corrosion rate. The experimental results indicated that the increase in silica ratio led to an increasing in the corrosion resistance of aluminum. Immersion time in potassium silicate solution showed a significant effect on silicate conversion coating and higher corrosion resistance was obtained with 400 s immersion. This behavior can be related to increasing the silicate coating continuity which formed on the surface. The coating performance evaluated in acidic and basic NaCl solution as well as the results showed the corresponding stability of nanosilica modified silicate conversion coating in these solutions.

Kurzfassung

Nanosiliziumdioxid-modifizierte Kaliumsilikatkonversionsschichten wurden auf der Oberfläche einer Aluminiumlegierung 2024 mittels Eintauchens hergestellt und anschließend wurde der Effekt der Eintauchzeit auf das Korrosionsverhalten der Schichten untersucht. Das Korrosionsverhalten der Schichten wurde mittels Impedanzspektroskopie, potentiodynamischen Messungen und Oberflächenanalyseverfahren charakterisiert. Die beschichteten Proben zeigten einen erheblichen Abfall der Korrosionsrate. Die experimentellen Ergebnisse zeigen, dass ein Anstieg des Siliziumdioxidanteils zu einem erhöhten Korrosionswiderstand des Aluminiums führt. Die Eintauchzeiten hatten einen signifikanten Effekt auf die Silikatkonversionsschichten und ein höherer Korrosionswiderstand stellte sich vor allem bei 400 s ein. Dieses Verhalten kann auf eine Erhöhung der Einheitlichkeit der Silikatschicht während ihrer Bildung auf der Oberfläche zurückgeführt werden. Die Schichtperformanz wurde in saurer und basischer NaCl-Lösung evaluiert und die Ergebnisse zeigen eine entsprechende Stabilität der Nanosiliziumdioxid-modifizierten Silikatkonversionsschichten in diesen Lösungen.


§Correspondence Address, Dr. I. Danaee, Abadan Faculty of Petroleum Engineering, Petroleum University of Technology, 619-63187-14331 Abadan, Iran, E-mail:

Dr. Iman Danaee, born in 1979, received his PhD in Electrochemistry in 2009. Currently, he is Assistant Professor of Electrochemistry-Corrosion as well as teacher and researcher in the Faculty of Petroleum Engineering at the Petroleum University of Technology in Abadan, Iran.

Hamed Bahri, born in 1990, is presently a MSc student of Technical Inspection Engineering in the Faculty of Petroleum Engineering at the Petroleum University of Technology in Abadan, Iran.

Dr. Gholam Reza Rashed, born in 1962, received his PhD in Mechanical Engineering in 2006. Currently, he is Associate Professor of Mechanical Engineering, teacher and researcher in the Faculty of Petroleum Engineering at the Petroleum University of Technology in Abadan, Iran.


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Published Online: 2015-04-21
Published in Print: 2015-04-30

© 2015, Carl Hanser Verlag, München

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