Electrochemical and Salt Spray Testing of Hybrid Coatings Based on Si and Zr Deposited on Aluminum and Its Alloys

2015 ◽  
Vol 162 (10) ◽  
pp. C592-C600 ◽  
Author(s):  
Peter Rodič ◽  
Ingrid Milošev
Keyword(s):  
Salt Spray ◽  
Hybrid Coatings ◽  
Salt Spray Testing

Development of Environmentally Acceptable Nano-Hybrid Coatings for Bio-Fouling Protection

2014 ◽  
Vol 938 ◽  
pp. 269-274 ◽  
Author(s):  
P. Saravanan ◽  
D. Duraibabu ◽  
S. Ananda Kumar
Keyword(s):  
Epoxy Resin ◽  
Salt Spray ◽  
Diglycidyl Ether ◽  
Sem Analysis ◽  
Hybrid Coatings ◽  
Spectral Studies ◽  
Chemical Polarization ◽  
Lower Toxicity ◽  
Ft Ir ◽  
Polarization Studies

Alternative coatings should be as effective as conventional paints but with lower toxicity. In the present study, a commercially available epoxy resin modified with non functionalized nanozinc oxide (nZnO) was examined to get information on its antifouling and anti-corrosive properties. Epoxy nanohybrid coating was synthesized using nZnO (in the amount of 0wt%, 1wt%, 3wt%, 5wt%, 7wt% and 10wt%) and diglycidyl ether of bisphenol A (DGEBA) type of epoxy resin. The curing behavior of these materials was ascertained from FT-IR spectral studies. The anti-corrosive properties of the nanohybrid were investigated using salt spray and electro chemical polarization studies. The surface morphology images were taken by SEM analysis. This study indicates that nZnO particles were dispersed homogenously through the polymer matrix. The nZnO incorporated coating was found to exhibit enhanced anticorrosive performance. Approximately 50% reduction in fouling attachment was achieved with coatings containing 3wt% of nZnO.

Study of Microstructure and Corrosion Resistance of Zinc Electrodeposits before and after Black Chromating

2017 ◽  
Vol 751 ◽  
pp. 119-124
Author(s):  
Kanokwan Saengkiettiyut ◽  
Pranee Rattanawaleedirojn ◽  
Adisak Thueploy ◽  
Jumpot Wanichsampan ◽  
Yuttanant Boonyongmaneerat
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Impedance ◽  
Salt Spray ◽  
Alkaline Electrolyte ◽  
Corrosion Properties ◽  
Electrochemical Testing ◽  
Before And After ◽  
Coat Layer ◽  
Zinc Coatings ◽  
Salt Spray Testing

In this work, microstructure and corrosion properties of zinc electroplated steel before and after black chromating was investigated. The test samples were prepared by electrodeposition process, using a commercially-available alkaline electrolyte. Subsequently, the galvanized samples were applied with a black chromate-based passivation layer and a clear top-coat layer. Their microstructures were examined using X-ray diffractometry and scanning electron microscopy. The corrosion resistance of the samples was assessed with the salt spray test, following the ASTM B117, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization in 5 wt.% NaCl solutions. The study showed that zinc electroplated steels exhibit (110) crystallographic orientation. The passivation and top-coat layers did not affect the microstructure of the zinc layer, and covered uniformly on the zinc layer for all sets of samples. The corrosion resistant results obtained from salt spray testing and electrochemical testing revealed that the microstructure of zinc coatings prepared by using different applied current did not influence on their corrosion resistance markedly. While black passivation followed by top coating provided a significant improvement on corrosion resistance of the coatings.

Selected Bibliography on Salt Spray Testing 1935–1946★

CORROSION ◽  
1948 ◽  
Vol 4 (10) ◽  
pp. 492-504 ◽  
Author(s):  
Lorraine R. Voigt
Keyword(s):  
Salt Spray ◽  
Salt Spray Testing
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