Whether you want to cast aluminum or other metal, there are certain considerations you should keep in mind. This article discusses several of them. Seven thousand series alloys for casting aluminum are used in the aerospace and automotive industries. They have excellent corrosion resistance, tensile strength, and ductility. Compared with the 2000 series, 7000 series alloys have lower fatigue properties and quench sensitivity. These alloys are used in automotive, aerospace, military, building, and sports goods. They are also used in high-speed trains.
Using a powder coat for Casting Aluminum provides a tough protective coating. In addition, it also offers durability, wears resistance, and attractive color options. The coating is also environmentally friendly since it contains no solvents or volatile organic compounds. When it comes to a surface finishing process, powder coating is the best bet. It is less expensive and easier to clean than traditional painting techniques. The coating is also resistant to wear and impact and creates a protective barrier against corrosion.
Alloys in the 7000 series are characterized by their low sensitivity to stress-corrosion cracking and hydrogen embrittlement. They have good workability and extrudability, and their microstructures are uniform. The material is also good for welding. These alloys are also used in the marine and automotive industries. Compared with the 2000 series, 7000 series alloys have less stress-corrosion cracking, lower quench sensitivity, and higher extrudability.
The primary alloying element in 7000 series alloys is zinc. The secondary alloying elements include magnesium and copper. In MA, No.1 showed the largest intergranular crack path, while No.2 had the smallest intergranular crack path. SRX was more evident in the alloy without Zr.
Low-dissolved atoms characterize the material. These dissolved atoms limit the movement of dislocation during annealing. This results in faster recrystallization of solutionized alloys. However, the 7000Zr alloy has incomplete recrystallization after three hours of annealing. The hardness of heat-treatable alloys is based on the alloy composition. The material hardness increases with higher temperatures and decreases with lower temperatures. It also depends on the heat treatment. For instance, silicon is non-heat treatable, while copper can be heated with solution heat treatment.
However, powder coating has some drawbacks. Applying smooth, texture-free coatings can be difficult, and it may not work on parts with small tolerances. The powder coating process is usually applied electrostatically, with charged powder particles adhering to the casting part until they are melted. The particles are then fused into a smooth, uniform coating in a curing oven.
Depending on the thickness of the item being coated, the exact temperature will vary. For example, some powder coating processes bake at 300F, while others have a softening temperature of around 80 degC. The softening temperature will also determine whether or not the powder coating will flake or peel off. The powder coating process is also less expensive than conventional painting methods. It is also more environmentally friendly since it does not require solvents, volatile organic compounds, or pollution control systems.
Whether producing anodized aluminum castings or decorative parts, you must ensure that the anodizing process is properly done. Your casts could look a bit out of place if you don’t. Following the rules of thumb when anodizing your cast aluminum is a good idea. The main one is that you need the right amount of time to anodize your part. If you do it too quickly, you won’t get anodized aluminum, which will look pitted.
The other thing you need to know is that anodizing cast aluminum is a process that will leave some impurities behind. This will affect the thickness of your anodized film. Fortunately, pretreatment of the aluminum surface before anodizing can improve the surface’s ability to anodize.
You should also know that there are different ways to anodize cast aluminum. The most common is to use sulfuric acid. It produces anodized coatings that are up to one millimeter thick. This method produces a tough outer skin that is resistant to abrasion and color fade. It can last many years, provided the parts are rinsed well before being them to the acid bath. Another way to improve your anodic coating is to use organic additives. These can improve the anodized oxide film’s thickness and corrosion resistance.