Corrosion resistance of nanosilicasilicate conversion coatings on aluminum prepared by the dip immersion method
-
Hamed Bahri
, Iman Danaee and Gholam Reza Rashed
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.
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© 2015, Carl Hanser Verlag, München
Articles in the same Issue
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- Effects of the thickness on the microstructure and corrosion behavior of a TiAlN film on 4140 steel
- The effect of anodizing conditions on the corrosion resistance of Ti6Al4V titanium alloy
- Frequency analysis of volumetric porosity in aluminum castings at high and low cooling rates
- Corrosion resistance of nanosilicasilicate conversion coatings on aluminum prepared by the dip immersion method
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- Einfluss der Klebschichtdicke auf Kopplungsfaktor und Lebensdauer beim Bekleben von piezoelektrischen Flächenwandlern mit Epoxykleber
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- Diffusion characteristics of plasma nitrided hard chromium on AISI 1010 steel
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- Investigation of joints between polypropylene and polybutylene terephthalate
- Parametric optimization of seam welding of stainless steel (SS 304) sheets
- Effect of the powder particle size on the wear behavior of boronized AISI 304 stainless steel
- Optimum buckling design of axially layered graded uniform columns
- Kalender/Calendar
- Kalender
Articles in the same Issue
- Inhalt/Contents
- Inhalt
- Fachbeiträge/Technical Contributions
- Effects of the thickness on the microstructure and corrosion behavior of a TiAlN film on 4140 steel
- The effect of anodizing conditions on the corrosion resistance of Ti6Al4V titanium alloy
- Frequency analysis of volumetric porosity in aluminum castings at high and low cooling rates
- Corrosion resistance of nanosilicasilicate conversion coatings on aluminum prepared by the dip immersion method
- Corrosion behavior of Haynes® 556® Fe-Ni-Cr-Co alloy for integrated coal gasification combined cycle syngas plants: A plant exposure study*
- Effects of Y2O3 and Al2O3 sintering additives on the hot pressing behavior of AlN ceramics
- Einfluss der Klebschichtdicke auf Kopplungsfaktor und Lebensdauer beim Bekleben von piezoelektrischen Flächenwandlern mit Epoxykleber
- Influence of the heat treatment on hardness and adhesive wear performance of Ni-P deposit with low phosphorus content
- Effect of plasma nitriding time on surface properties of hard chromium electroplated AISI 1010 steel
- Diffusion characteristics of plasma nitrided hard chromium on AISI 1010 steel
- Estimation of the mechanical properties of nanocomposites based on the properties prediction of single wall carbon nanotubes (SWCNT)
- Investigation of joints between polypropylene and polybutylene terephthalate
- Parametric optimization of seam welding of stainless steel (SS 304) sheets
- Effect of the powder particle size on the wear behavior of boronized AISI 304 stainless steel
- Optimum buckling design of axially layered graded uniform columns
- Kalender/Calendar
- Kalender