The Study Of Surface Wettability And Tribological Characteristics In Water Lubricate Of Al-Mg Alloy

Al-Mg alloy has a low density, light weight, good thermal conductivity, good corrosion resistance, it is a class of ferrous metals widely used in industrial areas in the current. However, due to surface wear resistance of Al-Mg alloy is poor, application of this material has been restricted. This article aims to change the surface wettability of Al-Mg alloy, thus, to improve the surface tribological properties of Al-Mg alloy under water lubrication, provide a theoretical basis and technical support for manufacture Al-Mg alloy of super-hydrophobic and wear. The main research work and results are as follows:1、Micro-structures were processed on surface of Al-Mg alloy by laser processing technology, such as frustum of a cone、notch of taper hole and pyramid, and self-assembled monolayers were deposited, Al-Mg alloy surface of superhydrophobic was prepared. The mathematical model was built according to three kinds of micro-structure morphology, quantitative analysis the affect of micro-structural size parameters on wettability. The results show that the biggest contact angle of superhydrophobic Al-Mg alloy can reach156°, the contact angles tend to smaller as the increment of the spacing of surface texture when the long-chain self-assembled monolayers were deposited, the contact angles tend to biger as the increment of the spacing of surface texture when the short-chain self-assembled monolayers were deposited.2、Self-assembled monolayers were deposited on surface of polished Al-Mg alloy, get different surfaces of wettability technology, study tribological properties of different wettability on Al-Mg alloy surface in conditions of dry friction, soaking lubrication, water-jet lubrication respectively, the results show that:more conducive to enhancing the wear resistance in water-jet lubrication for the hydrophobic or hydrophilic Al-Mg alloys, the smallest friction coefficient can reach0.2239, and contrast to coefficient of friction in three kinds of lubrications:dry friction> soaking lubrication> water-jet lubrication. The study also found that surface wear resistance of hydrophobic Al-Mg better than hydrophilic surface of Al-Mg alloy in same kinds of lubrication mode.3、SiO2particles were adhesived in the polished Al-Mg and surface of friction parts by epoxy resin solution, the contact angle of156°polished Al-Mg alloys of superhydrophobic and125°Si3N4of hydrophobicity were prepared, in conditions of dry friction, soaking lubrication, water-jet lubrication also, research on the friction properties of superhydrophobic Al-Mg alloy. The results showed that:more conducive to enhancing the wear resistance in water-jet lubrication for Al-Mg alloy superhydrophobic, the smallest friction coefficient can reach0.3342, and contrast to coefficient of friction in three kinds of lubrications:dry friction> water-jet lubrication> soaking lubrication. In same kinds of lubrication mode, the wear resistance of hydrophobic surface was best, followed by super-hydrophobic surface, hydrophilic surface was the worst. The study also found that the media of the same material or performance were coated between the friction and the friction medium, viscous phenomenon of same-sex attracted was appeared in the friction process, reducing the wear resistance of the material.