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Preparation and Tribological Properties of Hydrophobic Films on Aluminum Substrates

Author: ZhangQuan
Tutor: WanYong
School: Qingdao Technological University
Course: Mechanical Design and Theory
Keywords: Friction Self-assembly Surface texture Sol-gel method Hydrophobic
CLC: TG174.4
Type: Master's thesis
Year: 2013
Downloads: 6
Quote: 0
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Abstract


Nowadays, tribological performance of aluminum alloys had attracted a wide rangeof vision, as they are widely used in industrial. There are several ways to reduce frictionof aluminum in sliding contact. One way is to construct surface texture on the smoothsurface, in which texture can effectively reduce the friction by decreasing actual contactarea, and thus significantly improve the tribological properties of contact pair. Anotherway is to using self-assembly technology and sol-gel one. The main research content ofthis thesis is to firstly construct the surface texture on aluminum surface by usingchemical etching technology, and then coated textured surface by using sol-gel andself-assembly technology. We systematically study the formation mechanism of theinorganic-organic hybrid film, its surface morphology and wettability, with emphasizedon the tribological properties of the film. We also discuss the preparation conditions onthe wetting and tribological performance of films. The main results are as follows.（1） After aluminum were etched by NaOH solution and then coated by a film ofstearic acid, the contact angle of water of film is as large as140°, showing a highhydrophobicity. The hydrophobic film could effectively protect the aluminum substrate.（2） Al2O3or TiO2films were deposited on the aluminum, then coated by a film ofstearic acid. The film shows high hydrophobicity. Under load of0.5N, the wear life offilm could as long as2200s, showing good anti-friction and wear-resisting performance.（3）The sol-gel-derived Al2O3film on aluminum was treated by hydrazine hydratesolution and then deposited by film of stearic acid. The film obtained shows the contactangle as large as150°, and also present excellent antifriction and wear-resistingproperties.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology
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