ã€China Aluminum Network】 Cast aluminum alloys have been widely used in various fields of engineering because of their high specific strength, high specific rigidity, low density, good extrusion processing performance, and rich aluminum resources. However, cast aluminum alloys have low hardness and poor wear resistance, and are easily corroded under harsh environments. Therefore, for casting aluminum alloy to be used more widely, there must be corresponding surface treatment technology to improve these shortcomings. Aluminum alloy micro-arc oxidation technology can produce a layer of alumina ceramic film with high hardness, good wear resistance and corrosion resistance in situ on the surface of aluminum alloy, and has a strong binding force with the matrix. The technology can effectively solve the aluminum alloy surface hardness is low, poor wear resistance, corrosion and other defects, which can significantly extend the life of cast aluminum alloy products. At present, researchers have done a lot of researches on micro-arc oxidation of aluminum alloys, but they still encounter many problems in practical applications. In this paper, the best samples are selected under three kinds of system, and then the friction and wear comparison test is performed with the matrix.
The experimental material is a self-developed new high-strength Al-Cu cast aluminum alloy. Firstly, a cast aluminum alloy specimen of 30.5 mm×7 mm×8 mm was obtained by a wire cutting method, which was then sanded in order from coarse to fine, followed by degreasing with acetone and cleaning with an ultrasonic cleaner. The micro-arc oxidation experiment of the solution formulation was carried out on alumina, phosphate, and silicate systems using self-made micro-arc oxidation equipment.
In this experiment, the MMS-2A screen-type friction and wear tester was used to evaluate the wear resistance of the ceramic layer. The abrasion resistance and friction coefficient of the micro-arc oxidation specimen and the substrate under reciprocating motion were measured. In this experiment, GDL steel was used as the grinding material, and the external dimensions were the same as those of the aluminum alloy specimen. The friction type is sliding friction, and the lubricant oil is a special hydraulic refrigeration oil with a drip speed of 40 d/min. Load 100N, speed 200r/min, test time 30min. After the test is completed, the sample is repeatedly cleaned and dried, and the mass of the test sample is weighed accurately. Calculate the wear quality loss.
As a result, it was found that the abrasion resistance of the samples treated with micro-arc oxidation was significantly improved compared to that of the matrix, and the increase in the wear resistance in the aluminate system, the phosphate system, and the silicate system decreased in turn. .
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