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Due to the special properties of aluminum, the electroplating of casting aluminum parts requires special pre-treatments. These pre-treatments need to be adjusted due to different aluminum materials and different parts. They cannot simply follow the general process. Therefore, for the workers who are engaged in the electroplating of aluminum cast parts, it is sometimes necessary to perform the test of the plating pretreatment of the die-cast aluminum parts. To carry out this test, the first is the selection of the pretreatment process and the design of the improved method by aluminium extrusion china supplier.
The electroplating pretreatment of casting aluminum parts/aluminum alloy castings includes four important processes such as degreasing, acid etching, electroless plating or displacement plating, and pre-plating. The most important of these is electroless plating or displacement plating. Therefore, the tests that are often done are concentrated on this process. Of course, different aluminum materials and different processing methods have different requirements for pretreatment. For example, the pretreatment of aluminum casting parts and rolled aluminum parts is very different, and even if the same processing method, different aluminum materials are different. The pre-treatment process, such as the amount of copper in aluminum, directly affects the adhesion of the coating. The test of the pre-treatment scheme of the electroplating of the die-casting aluminum parts is also a systematic comparative test. It is necessary to perform processing of different selected pre-treatment processes on the sample pieces, and then perform the same electroplating process and then measure the bonding force thereof. The point of this comparative test is to ensure that, except for differential process points, the other processes are all identical conditions, otherwise there is no comparability and no evaluation can be made.
Four Common Methods for Plating Aluminum Parts:
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 film weight change. Studies have shown that yttrium nitrate has good water solubility, low dosage, and rapid film formation, and is an effective promoter of aluminum phosphating: Fluoride can promote film formation, increase film weight, and refine grains; Mn2+, Ni2+ can be obviously Grain refinement makes the phosphating film uniform and dense and can improve the appearance of the phosphating film. When the Zn2+ concentration is low, film formation or film formation cannot be made worse. As the concentration of Zn2+ increases, the film weight increases the content of O4 to the phosphating film. The impact is greater, increase PO4. The content increased the weight of the phosphating film.