[China Aluminum Network] Because of the special properties of aluminum, the electroplating of aluminum die casting parts requires special pre-treatments. These pre-treatments need to be adjusted due to different aluminum materials and different parts. Process. Therefore, for the workers engaged in the plating of aluminum die-casting parts, sometimes need to do the test of the plating pretreatment of the die-casting aluminum parts. To carry out this kind of test, the first is the selection of the pretreatment process and the design of the improved method. The electroplating pretreatment of die-cast aluminum parts/aluminum alloy die castings includes four important processes, such as degreasing, acid etching, electroless plating or displacement plating, and preplating. The key is electroless plating or displacement plating. Therefore, the tests that are often done are Concentrate on this process. Of course different aluminum and different processing methods have different requirements on the pre-treatment, such as the pre-processing of die-cast aluminum parts and rolled aluminum parts are very different, and even the same processing method Different aluminum materials also have different pretreatment processes. For example, the amount of copper contained in aluminum directly affects the binding force of the coating. The pretreatment scheme for plating of aluminum die-cast parts is also a systematic comparative test. The sample is treated differently before the selected treatment process, and then the same electroplating process is performed, and then the binding force is tested. The point of this comparative test is to ensure that in addition to the differential process point, other processes are the same conditions, otherwise There is no comparability and no evaluation can be made. Die casting aluminum parts plating common four methods: Aluminum phosphating The effects of accelerators, fluorides, Mn2+, Ni2+, Zn2+, PO4, and Fe2+ on the phosphating process of aluminum were studied in detail by means of SEM, XRD, potential-time curve, and membrane weight changes. Studies have shown that: It has the characteristics of good water solubility, low dosage, and rapid film formation. It is an effective promoter of phosphating aluminum: fluoride can promote film formation, increase film weight and refine grains; Mn2+, Ni2+ can significantly refine grains, The phosphating film is uniform and dense, and the appearance of the phosphating film can be improved. When the Zn2+ concentration is low, the film cannot be formed or the film is poor. With the increase of the Zn2+ concentration, the increase of the film weight O4 content has a greater effect on the weight of the phosphating film. The PO4 content increases the phosphating film weight. Al electrolytic alkaline polishing process The alkaline polishing solution system was studied, and the effect of corrosion inhibitors, viscosity modifiers, etc. on the polishing effect was compared. Alkaline solution system with good polishing effect of zinc aluminum die casting was successfully obtained, and the operating temperature was reduced for the first time. , Additives that extend the service life of the solution and also improve the polishing effect. The experimental results show that the addition of appropriate additives in NaOH solution can produce good polishing effect. Exploratory experiments also found that: using NaOH solution of glucose under certain conditions After DC electro-polishing, the surface reflectivity of aluminum can reach 90%. However, due to the instability of the experiment, further research is needed. The feasibility of using DC pulse electrolysis polishing to polish aluminum under alkaline conditions is explored. The results show that the pulsed electrolytic polishing method can achieve the leveling effect of DC constant voltage electrolytic polishing, but its leveling speed is slow. Aluminum and Aluminum Alloy Eco-friendly Chemical Polishing Determined to develop a new environmentally friendly chemical polishing technology based on phosphoric acid-sulfuric acid. This technology is to achieve zero emission of NOx and overcome the existing quality defects of similar technologies. The key to new technology is to add some special effects in the base fluid. Compounds are used to replace nitric acid. For this purpose, the tribasic acid chemical polishing process of aluminum needs to be analyzed first. In particular, the role of nitric acid must be studied. The main role of nitric acid in aluminum chemical polishing is to suppress pitting corrosion and improve polishing brightness. A chemical polishing test in sulfuric acid, it is believed that the addition of special substances in monosulfuric acid should be able to inhibit pitting corrosion, slow overall corrosion, and must have good leveling and brightening effects. Electrochemical Surface Strengthening of Aluminum and Its Alloys The process, properties, morphology, composition and structure of the ceramic-like amorphous composite conversion film were deposited by anodization of aluminum and its alloys in a neutral system. The film formation process and mechanism of the film layer were preliminarily investigated. The results of the process study show that: In the Na_2WO_4 neutral mixed system, the concentration of the film forming accelerator is controlled to be 2.5 to 3.0 g/l, the concentration of the complex film former is 1.5 to 3.0 g/l, and the concentration of Na_2WO_4 is 0.5 to 0.8 g/l. The current density is 6-12A/dm-2, weak stirring, can get a complete and uniform, good gloss gray inorganic non-metallic film layer. The film thickness of 5 - 10μm, microhardness of 300 - 540HV, excellent corrosion resistance. The neutral system has a good adaptability to aluminum alloy, rust aluminum, wrought aluminum and other series of aluminum alloy can be better film. Bulkhead Light,Flood Led Light,Flood Lights,Led Flood Light JIANGMEN MOSCOT OPTOELECTRONIC TECHNOLOGY CO.,LTD. , https://www.jmsensorsled.com