Metal forgings are widely used in machinery, automobile, aviation and other fields, and the choice of surface treatment technology and equipment has an important impact on the performance and life of parts. This article will introduce the commonly used metal forgings surface treatment technology and the selection principle of the corresponding equipment, aimed at helping readers to understand and master the relevant technology and equipment, improve the quality and performance of metal forgings.
Surface treatment technology:
Electrophoretic coating: The metal surface is immersed in electrophoretic paint, and the paint is evenly covered on the metal surface by the action of electric current. The technology is suitable for metal forgings with high decorative requirements, and has the advantages of uniform coating thickness, strong adhesion and corrosion resistance.
REDOX treatment: Through chemical reaction on the surface of the metal to produce an oxide film or reduction film, improve the corrosion resistance and beauty of the metal. Commonly used oxidants include concentrated sulfuric acid, chromic acid, etc., reducing agents include sodium nitrate, sodium nitrite, etc.
Spraying treatment: The use of compressed air to spray paint on the metal surface, suitable for large area, complex shape of metal forgings. Spraying technology includes air spraying, high pressure airless spraying, etc., which can be selected according to the characteristics of the paint and the requirements of the workpiece.
Thermal spraying: The coating is formed by heating the paint so that it has a molten or semi-molten state and is then sprayed onto the metal surface to form a coating. Thermal spraying technology includes arc spraying, plasma spraying, etc., which has the advantages of strong coating bonding force and corrosion resistance.
Equipment selection:
Electrophoretic coating equipment: including electrophoretic tank, electrode, power supply, stirring device, etc. The appropriate electrophoretic coating equipment should be selected according to the coating area and coating speed to ensure uniform and smooth coating.
REDOX treatment equipment: including oxidation tank, reduction tank, heating device, etc. The appropriate REDOX treatment equipment should be selected according to the type of treatment liquid and the size of the workpiece to ensure that the generated oxide film or reduction film thickness meets the requirements.
Spray treatment equipment: including spray gun, compressed air system, paint supply system, etc. The appropriate spraying equipment should be selected according to the spraying area and the type of coating to ensure that the coating thickness and appearance quality meet the requirements.
Thermal spraying equipment: including burner, spray gun, paint supply system, etc. The appropriate thermal spraying equipment should be selected according to the workpiece size and coating requirements to ensure that the coating quality and binding force meet the requirements.
Operating points:
Before surface treatment, hardware forgings should be cleaned, oiled, rust and other pretreatment to ensure that the surface is clean, smooth and improve adhesion.
According to the requirements of metal forgings and the characteristics of surface treatment technology, the appropriate treatment method and equipment are selected to ensure that the desired treatment effect is achieved.
When performing surface treatment, attention should be paid to safe operation to avoid harm to the human body and the environment caused by chemical reagents.
After surface treatment, the quality inspection of the metal forgings should be carried out to ensure that the surface quality, thickness and adhesion meet the requirements.
This paper introduces the common surface treatment technology of metal forgings and the selection principle of corresponding equipment, including electrophoretic coating, REDOX treatment, spray treatment and thermal spraying. According to the surface treatment technology and process requirements, combined with the actual production needs, the selection of appropriate equipment type and quantity is the key to improve the quality of metal forging production. By mastering the operation points of relevant technology and equipment, the quality and performance of hardware forgings can be improved, production costs can be reduced, and the competitiveness of enterprises can be improved.
