Aluminum alloy hand plate after anodizing, if the surface appears white spot, then what is the reason? For this problem, if the aluminum alloy hand plate appears this defect problem, then it may be because the organization is too loose, so that the porosity of the material is too high. If there is too much impurity in the raw material, it will also lead to this problem. Therefore, we should take some necessary measures to solve and prevent:

Method 1: High voltage and high current density impact method. At the early stage of anodic oxidation, high voltage and high current shock is adopted, so that the size of the "islands" that were originally divided by impurities are connected into pieces by high current shock. Then after full cleaning can dye more satisfactory oxide film, white spots basically disappear.

The above method is slightly insufficient if the hand plate has a screw hole, it may be slightly expanded, so it is necessary to control the high current density, high voltage anodizing time, and prevent the temperature of the anodizing solution from rising too quickly. During continuous production, the anodizing solution should be cooled.

Method 2: hand surface grinding method. Grinding can make the ground down aluminum to fill the pores of the hand plate, play the role of connecting the impurities isolated block "island" bridge.

Because the polished aluminum finish sometimes can not play a real filling, bridge role, some parts of the filling will be corroded in the process of alkali corrosion and anodic oxidation and fall off.

Method 3: hand board surface shot peening method. Before the trial of shot peening method, the author used the method of hammer with round head, which intended to make the gap blocking the "island" closed by knocking, so as to achieve the purpose of connecting into pieces. The result was remarkable.

What is the yield strength of aluminum alloy hand plate related to? What is its tolerance? And, in the aluminum hand plate, how to choose the material? The yield strength of aluminum alloy hand plate, its main, is related to the brand of aluminum alloy, mainly to have it to decide. For this kind of hand plate tolerance, generally on the lathe, is 0.2-0.5.

For aluminum alloy hand plate material selection, it is to see the specific situation. If it is a foundry, then the molding sand with foundry should be used. If it is for the hand plate, then should use the steel 3Cr2W8V, because it is a heat-resistant steel, not easy to deformation and cracking at high temperature.