Electrophoresis Technology of Aluminum Casting

Electrophoretic coating (electro-coating) is a coating method that uses an external electric field to make particles such as pigments and resins suspended in an electrophoretic liquid migrate directionally and deposit them on the surface of a substrate of one of the electrodes. Electrophoretic coating is to put the workpiece and the corresponding electrode into the water-soluble paint, connected to the power supply, relying on the physical and chemical effects generated by the electric field, so that the resin in the paint, pigments and fillers are uniformly precipitated and deposited on the surface of the coated object as the electrode to form a water-insoluble paint film. Electrophoretic coating is an extremely complex electrochemical reaction process, which includes at least four processes: electrophoresis, electrodeposition, electroosmosis and electrolysis. Electrophoretic coating according to the deposition performance can be divided into anodic electrophoresis (workpiece is anode, coating is anionic) and cathodic electrophoresis (workpiece is cathode, coating is cationic); According to the power supply can be divided into DC electrophoresis and AC electrophoresis; According to the process method, there are constant voltage and constant current method. At present, the anode electrophoresis of the DC power supply constant voltage method is widely used in industry.

Anodizing treatment of aluminum castings

Anodic oxidation of aluminum alloy is a process in which aluminum alloy products are set with anodes and placed in a pool containing electrolyte solution for electrification treatment, and a dense alumina film is formed on the surface of aluminum alloy castings by electrolysis,. Anodizing is an electrolytic oxidation in which the surface of an aluminum alloy is usually converted into an oxide film that has protective, decorative, and other functions. Anodizing of aluminum castings is a simple electrochemical method developed 50 years ago to form a protective layer of aluminum oxide on the surface of aluminum castings. The life of the topcoat is proportional to the thickness of the applied anodic coating. Alumina is a hard, durable, weather-resistant substance that protects the base metal. The coating may be colored by dyeing, or may exhibit a bronze tone by diffraction phenomena produced by the coating. By this electrochemical process, a coating is formed from the surface of the cast aluminum. The coating is indispensable to the metal and will not peel or peel off.

Tin-plated aluminum castings

Tin plating of aluminum alloy castings is a surface treatment technology designed to improve the corrosion resistance, aesthetics and service life of aluminum alloy castings.

The process of tin plating includes electrolytic tin plating and hot dip tin plating.

Electrolytic tin plating is to coat a layer of tin on the metal surface through electrolysis. The production cost is low and the quality of the finished product is relatively stable and reliable.

Hot dip tin plating is the metal material immersed in the molten tin, suitable for large, irregular shaped metal products, the finished tin layer is thick, durable.

The process of tin plating includes two kinds:

Electrolytic tin plating and hot-dip tin plating

aluminum casting polishing

Polishing aluminum castings is a process of treating the surface of aluminum castings through a variety of methods and techniques to improve their surface quality, smoothness and aesthetics. The main purpose of polishing aluminum castings is to remove surface defects, unevenness and impurities, so that the surface of aluminum castings can achieve a certain degree of smoothness and brightness, thereby improving its corrosion resistance, aesthetics and performance.

Dongrun Foundry has an independent polishing workshop and mature aluminum casting surface polishing technology, so as to meet the customer's polishing, mirror polishing, wire drawing and other high-end surface requirements.

aluminum casting polishing method:

Mechanical polishing, chemical polishing, electrolytic polishing, ultrasonic polishing, fluid polishing and magnetic abrasive polishing, etc.

Plastic Spraying Process for Aluminum Castings

The aluminum casting spray process is a process in which the plastic powder is evenly sprayed on the surface of the aluminum casting through the spray gun, and then baked at high temperature to melt, level and solidify the plastic powder to form a dense coating. This process is mainly used to protect and decorate the surface of aluminum castings, so that it has the functions of anti-corrosion, anti-wear, waterproof, and dustproof. At the same time, it can also enhance the appearance of aluminum castings and improve product quality and service life.

Surface Shot Blasting Treatment of Aluminum Castings

The surface shot blasting treatment of aluminum castings is a surface treatment process designed to throw the shot to the surface of the aluminum castings through a high-speed rotating impeller to achieve the purpose of cleaning and strengthening the surface.

Shot blasting process is relatively simple, low investment cost, and can significantly improve the quality and performance of aluminum castings, so it has been widely used in industrial production. It should be noted that because the concentration of aluminum powder in aluminum castings is too high, it may cause an explosion, so explosion-proof dust removal equipment should be used in the shot blasting process to ensure safety.

Dongrun has its own shot blasting workshop, equipped with several hook shot blasting machines, drum shot blasting machines and sandblasting machines. To meet the different requirements of customer size pieces of shot blasting.

Grinding and Seismic Technology of Aluminum Castings

The grinding and shock light process of aluminum castings mainly includes two steps of grinding and shock light, which aims to improve the smoothness and accuracy of the surface of aluminum castings.

The grinding process:
The grinding process uses vibration grinding machine, centrifugal polishing machine and other equipment to achieve the effect of deburring and polishing the surface by grinding stone, grinding agent, water and so on in the process of vibration (rotation) and die casting friction. This step helps to improve the flatness and smoothness of the surface of aluminum castings and provides a good foundation for subsequent processing and treatment.

Shock process:
The shock light process uses the vibration grinding machine used in shock grinding, and adopts the advanced processing principle of spiral flow and three-dimensional vibration, so that the abrasive and the workpiece inside the machine produce mutual extrusion and friction, resulting in uniform force, which plays a good role in the decoration of the workpiece. This step can significantly improve the surface finish and accuracy of the parts, so that the surface roughness can reach a very low level, such as Ra0.1-Ra0.01μm, so as to meet the requirements of high-precision applications.

Nickel-plated aluminum castings

Nickel plating of aluminum castings is the process of depositing a layer of nickel on aluminum castings by electrolytic or chemical methods. This process is called nickel plating. Nickel plating can be divided into electroless nickel plating and electroless nickel plating.

The process of nickel plating on aluminum castings can not only improve the wear resistance and corrosion resistance of aluminum castings, but also provide good decorative effects. The nickel plating layer has high stability in the air, can resist the corrosion of the atmosphere, alkali and some acids, and has good polishing performance and can maintain long-term luster. In addition, the hardness of the nickel coating is relatively high, which can improve the wear resistance of the surface of the product, and is widely used in the printing industry, chemical equipment and other fields.