Photocatalystic Cathodic Protection of TiO2 Coating on AZ31 Magnesium Alloy

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Nano TiO2 and S, N co-doped TiO2 composite coatings with WO3 transitional layer were deposited on AZ31 magnesium alloy by sol-gel method. The morphologies, structure, mechanical properties, compositional depth profiles and anti-corrosion performance of the as prepared coatings were characterized by scanning electron microscope, X-ray diffraction, nanoscratch test, glowing discharge optical emission spectrometry and electrochemical method, respectively. The results show that the nano TiO2 coatings are continuous, uniform and dense with thickness ca.3-5μm, elements in the interface diffuse mutually during heat treatment; S-N co-doped TiO2 enhances the interface adhesion, WO3 transitional layer increases the total coating thickness and strengthens the adhesion to substrate with respect to unitary TiO2 coating; S, N co-doped TiO2 acts as visible light photocatalyst that can provide permanent cathodic protection for AZ31 magnesium using WO3 as electron restoring material.

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Periodical:

Edited by:

Yafang Han, Fusheng Pan, Jianmao Tang, Chungen Zhou

Pages:

280-286

DOI:

10.4028/www.scientific.net/MSF.686.280

Citation:

Z. L. Wang "Photocatalystic Cathodic Protection of TiO2 Coating on AZ31 Magnesium Alloy", Materials Science Forum, Vol. 686, pp. 280-286, 2011

Online since:

June 2011

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$35.00

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