Why is die -cast aluminum not suitable for anodizing?2019年12月24日
Die-casting aluminum oxide blackening solution
Aluminum is one of the non-ferrous metals in the metal category. Due to its wide application, it is introduced separately as follows: There are two types of aluminum profiles and die-cast aluminum alloys. Among them, aluminum ingots with a purity of more than 92% are the main raw materials. At the same time, metal elements such as carbon, magnesium, silicon, sulfur, etc. are added to increase strength, hardness, wear resistance and other properties to form a variety of "alloys".
1.1 aluminum profile
Aluminum profiles such as screens and windows are common. It uses an extrusion molding process, that is, after melting raw materials such as aluminum ingots in a furnace, it is extruded into a mold through an extruder to flow out, and it can also extrude profiles with various cross sections. The main performances are strength, hardness, and abrasion resistance according to national standard GB6063. The advantages are: light weight is only 2. 8, no rust, fast design changes, low mold investment, longitudinal elongation of up to 10 meters or more. The appearance of aluminum profile is divided into bright and matte. Its treatment process adopts anodizing treatment, and the surface treatment oxide film reaches a thickness of 0.12m / m. The thickness of the aluminum profile is selected according to the optimization of the product design. It is not thicker on the market, the better. It should be designed according to the requirements of the cross-section structure. It can be uneven from 0.5 to 5 mm. The layman thinks that thicker and tougher is actually wrong.
The surface quality of aluminum profiles also has disadvantages that are difficult to overcome: warping, deformation, black lines, dents and white lines. Those with high designer level and reasonable mold design and production technology can avoid the above-mentioned defects. The inspection of defects should be carried out according to the inspection methods prescribed by the state, that is, the sight distance is 40 ~ 50CM to judge the defects.
Aluminum profiles are widely used in furniture: screen skeletons, various hanging beams, table legs, decorative strips, handles, cable trunking and covers, chair tubes, etc., which can be designed and used in ever-changing ways!