High quality coating pre-treatment equipment is offered by China manufacturer Qingguo Intelligent.Coating Pre-treatment Equipment is used to prepare the surface of a workpiece before the coating process to ensure good adhesion, corrosion resistance, and overall coating quality.Here's a detailed look:
1.Degreasing Equipment
- Spray - type Degreasing Machine: It typically consists of a spraying chamber, a set of spray nozzles, a circulation pump, and a tank for the degreasing solution.The workpieces are placed on a conveyor belt and passed through the spraying chamber.The spray nozzles are designed to evenly distribute the degreasing solution, which usually contains alkaline chemicals, surfactants, or solvents, over the surface of the workpieces.The circulation pump ensures a continuous supply of the solution, and the tank stores and recycles the used solution after filtration.
- Immersion - type Degreasing Tank: Comprises a large tank filled with the degreasing agent.Workpieces are immersed in the solution for a certain period.The tank may have heating elements to maintain an optimal temperature for better degreasing performance.Agitation devices such as air spargers or mechanical stirrers are often installed to enhance the contact between the solution and the workpiece surface and to dislodge stubborn grease.
2.Pickling Equipment
- Acid Pickling Tank: Made of acid - resistant materials such as rubber - lined steel or fiberglass - reinforced plastic.It contains an acid solution, usually hydrochloric acid, sulfuric acid, or phosphoric acid, depending on the material of the workpiece and the type of scale or oxide to be removed.The workpieces are immersed in the acid tank, and the acid reacts with the surface oxides, rust, or other contaminants to dissolve them.The tank is equipped with a ventilation system to remove the fumes generated during the pickling process.
- Spray - Pickling System: Similar to the spray - type degreasing machine in structure.The acid solution is sprayed onto the workpiece surface through nozzles.This method is more suitable for workpieces with complex shapes or for situations where a more controlled pickling process is required.The sprayed acid solution can reach areas that may be difficult to access in an immersion - type tank.
3.Phosphating Equipment
- Phosphating Tank: Contains a phosphating solution, which is usually a mixture of phosphoric acid, metal salts (such as zinc, manganese, or iron salts), and accelerators.The workpieces are immersed in the tank, and a chemical reaction occurs on the surface, forming a phosphate conversion coating.The tank has a temperature - control system to maintain the proper reaction temperature, usually around 50 - 95°C.The coating thickness can be controlled by adjusting the immersion time, solution concentration, and temperature.
- Spray - Phosphating System: Used to apply the phosphating solution to the workpiece surface by spraying.It offers a more uniform coating on workpieces with irregular shapes.The system also includes a filtration unit to remove any particulate matter from the phosphating solution and a drying unit to remove excess water before the coating process.
4.Shot Blasting Equipment
- Shot Blasting Machine: Consists of a blasting chamber, a shot - storage hopper, a blast wheel, and a dust - collection system.The workpieces are placed inside the blasting chamber.The blast wheel accelerates the abrasive media (such as steel shot, sand, or grit) and projects them onto the workpiece surface.The abrasive media removes rust, scale, and old coatings by impact.The shot - storage hopper stores and feeds the abrasive media to the blast wheel.The dust - collection system captures the dust generated during the blasting process to maintain a clean working environment.
1.Improved Coating Adhesion
- The pre - treatment processes remove contaminants such as grease, rust, and oxides from the workpiece surface.For example, phosphating forms a micro - porous phosphate coating that provides excellent mechanical interlocking with the subsequent coating, ensuring that the coating adheres firmly to the surface.This helps to prevent the coating from peeling or flaking off during use.
2.Enhanced Corrosion Resistance
- By removing corrosive substances and creating a protective conversion coating (like the phosphate coating), the pre - treatment equipment significantly improves the corrosion - resistance of the workpiece.The phosphate coating acts as a barrier between the base material and the environment, inhibiting the penetration of moisture and corrosive agents.
3.Uniform Coating Appearance
- Shot blasting, in particular, can create a uniform and clean surface texture.Degreasing and pickling also ensure that the surface is free from irregularities caused by contaminants.This leads to a more even application of the coating, resulting in a better - looking and more consistent finish.
4.Increased Coating Lifespan
- The combination of improved adhesion and enhanced corrosion resistance provided by pre - treatment means that the coating can last longer.This is especially important for products that are exposed to harsh environments such as outdoor structures, automotive parts, and industrial machinery.
1.Automotive Industry
- In the production of car bodies and parts, Coating Pre-treatment equipment is used to prepare the surfaces of components such as engine blocks, chassis, and body panels.Degreasing removes oil and grease from machining operations, pickling treats any surface rust, and phosphating provides a good base for the subsequent painting or powder coating, improving the durability and appearance of the vehicle's finish.
2.Appliance Manufacturing
- For household appliances like refrigerators, washing machines, and air conditioners, the equipment is used to pre - treat the outer shells.Degreasing and pickling ensure a clean surface, and phosphating helps the paint adhere well and provides corrosion protection, which is essential for the long - term performance and appearance of the appliances.
3.Metal Furniture Industry
- Metal furniture frames and panels are pre - treated to enhance the adhesion of the paint or powder coating.Shot blasting can give a decorative texture to the surface while also removing any rust or scale.Degreasing and phosphating further improve the quality of the coating, making the furniture more durable and aesthetically pleasing.
4.General Industrial Machinery
- Machinery parts such as gears, shafts, and housings are pre - treated to protect them from corrosion and to ensure a good coating finish.The pre - treatment processes help to maintain the integrity of the parts during operation and extend their service life.
1.Chemical Handling
- When using degreasing, pickling, and phosphating chemicals, proper personal protective equipment (PPE) such as gloves, goggles, and acid - resistant aprons must be worn.The chemicals should be stored in a well - ventilated and properly labeled area, away from incompatible substances.The handling and disposal of chemical waste must comply with environmental regulations.
2.Equipment Maintenance
- Regularly clean and maintain the equipment to prevent clogging of nozzles in spray - type systems and to ensure the proper functioning of pumps, valves, and agitation devices.For shot blasting equipment, check and replace the abrasive media regularly to maintain the blasting efficiency and quality.The dust - collection system should be maintained to prevent dust from escaping and to ensure a healthy working environment.
3.Process Control
- Monitor and control the process parameters such as temperature, concentration, and immersion or spraying time.Deviations from the recommended parameters can lead to incomplete pre - treatment or over - treatment, which may affect the coating quality.Use appropriate testing methods such as titration for chemical solutions and surface roughness measurements for shot - blasted surfaces to ensure the quality of the pre - treatment process.
4.Safety in Operation
- For equipment that involves high - pressure spraying (such as some degreasing and phosphating systems) or high - speed abrasive projection (shot blasting), ensure that safety guards are in place and that operators are trained to use the equipment safely.In addition, proper ventilation is essential to remove fumes and dust generated during the pre - treatment processes to prevent health hazards to the operators.
