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Influence of TiO2 Additives on Cavitation Erosion Resistance of Al-Mg Alloy Micro-Arc Oxidation Coating

by 1,2, 3,4,* and 2
1
School of Mechatronic and Power Engineering, Zhangjiagang Campus, Jiangsu University of Science and Technology, Zhenjiang 212003, China
2
School of Mechanical Engineering, Tongji University, Shanghai 201804, China
3
Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology, Jiangnan University, Wuxi 214122, China
4
School of Mechanical Engineering, Jiangnan University, Wuxi 214122, China
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(8), 521; https://doi.org/10.3390/coatings9080521
Received: 12 July 2019 / Revised: 10 August 2019 / Accepted: 12 August 2019 / Published: 16 August 2019
Four ceramic coatings are fabricated on 6061 aluminum alloy substrates with a micro-arc oxidation technique in silicate electrolytes with different TiO2 nano-additive concentrations. To explore the cavitation erosion resistance of the micro-arc oxidation (MAO) coating, cavitation tests are performed using a vibratory test rig. After cavitation tests lasting 10 min, the mass losses, surface morphologies, and chemical compositions of the samples after cavitation tests are examined using a digital balance, scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS), respectively. The results indicate that, in contrast to the aluminum alloy, the MAO coatings, by adjusting TiO2 nano-additive concentration, can decrease the mean depth of erosion rate (MDER) due to the cavitation damage, and lead to an excellent cavitation erosion resistance. The results also show that: In contrast to aluminum alloy, MAO coatings can decrease the MDER due to the cavitation damage in a short period of time by adjusting TiO2 nano-additive concentration. With the increase of TiO2 nano-additive concentration, the compactness and the surface hardness of MAO coatings decrease, which can easily lead to larger erosion pits. View Full-Text
Keywords: TiO2 nano-additive; aluminum alloy; micro-arc oxidation coating; cavitation erosion resistance; pits TiO2 nano-additive; aluminum alloy; micro-arc oxidation coating; cavitation erosion resistance; pits
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MDPI and ACS Style

Jiang, H.; Cheng, F.; Fang, D. Influence of TiO2 Additives on Cavitation Erosion Resistance of Al-Mg Alloy Micro-Arc Oxidation Coating. Coatings 2019, 9, 521. https://doi.org/10.3390/coatings9080521

AMA Style

Jiang H, Cheng F, Fang D. Influence of TiO2 Additives on Cavitation Erosion Resistance of Al-Mg Alloy Micro-Arc Oxidation Coating. Coatings. 2019; 9(8):521. https://doi.org/10.3390/coatings9080521

Chicago/Turabian Style

Jiang, Hongyan, Feng Cheng, and Dianjun Fang. 2019. "Influence of TiO2 Additives on Cavitation Erosion Resistance of Al-Mg Alloy Micro-Arc Oxidation Coating" Coatings 9, no. 8: 521. https://doi.org/10.3390/coatings9080521

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