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Summary of 7 surface treatment processes(Surface treatment of sheet metal parts)

Apr 15,21

Summary of 7 surface treatment processes(Surface treatment of sheet metal parts)

Vacuum plating

Vacuum Metalizing: A phenomenon of physical deposition.In other words, argon is injected under the vacuum state, and argon impacts on the target material. The molecules separated from the target material are adsorbed by the conductive goods to form a uniform and smooth metal-like surface layer.
Typical Products: Reflective Coatings, Consumer Electronics and Surface Treatments for Heat Insulation Boards
Output suitable for: single to large quantities
Quality: High quality, highlighting and product surface protection
Speed: Medium production speed, 6 hours/cycle (including painting)
Applied materials
1. Many materials can be vacuum plated, including metals, hard and soft plastics, composites, ceramics and glass.Aluminium is the most commonly used surface treatment for electroplating, followed by silver and copper.
2, natural materials are not suitable for vacuum plating treatment, because the moisture of natural materials themselves will affect the vacuum environment.



Electrolytic polishing

Electropolishing: With the polished workpiece as the anode and the insoluble metal as the cathode, the two poles are immersed in the electrolytic cell at the same time. Through the direct current ionization reaction, selective anodic dissolution is produced, so that the surface of the workpiece can be removed fine burrows and the brightness can be increased.
Typical products: building structures, food processing and storage, and medical pharmaceuticals
Output suitable for: single to large quantities
Quality: surface is bright, smooth and hygienic
Speed: Medium production speed, 5-30 min/cycle
1. Most metals can be electrolytically polished, most commonly for surface polishing of stainless steels (especially for austenitic core grade stainless steels).
2. Different materials can not be electrolytically polished at the same time, or even placed in the same electrolytic solvent.


Photoetching surface treatment
Photo Etching: Photoetching: Photoetching, the process of producing a photographic image of an anticorrosive film to protect the surface by Etching metal, plastic, etc., using chemical Etching to produce a textured surface.
Typical Products: Surface finish for jewelry, nameplates and trophies
Output suitable for: single to large quantities
Quality: Photoetched surface treatment can be achieved with extended exposure and chemicals
Speed: Medium production speed (50-100 microns /5 min)
Applied materials
1. Most metals are suitable for photoetching surface treatment, the most common are stainless steel, mild steel, aluminum, brass, nickel, tin, copper and silver.Aluminum has the fastest photoetching speed, while stainless steel has the slowest photoetching speed.
2. Glass and ceramics are also suitable for photoetching surface treatment, but different photoresist and chemical substances are needed.


Pad printing process
Pad Printing: The ability to print words, graphics, and images on irregular surfaces is becoming an important specialty Printing.



Typical Products: Surface printing for vehicle interiors, consumer electronics and sports equipment
Output suitable for: single to large quantities
Quality: Achieve clear print details, even on undulating surfaces
Speed: Single printing time (1-5 seconds)
Applied materials
Pad printing process can be used for almost all materials, except for materials that are softer than silicone pads, such as PTFE.

Galvanized process
Galvanizing: it is a surface treatment technology to plating zinc on the surface of iron and steel alloy materials to play the functions of aesthetic appearance and rust prevention. The zinc layer on the surface is an electrochemical protective layer, which can prevent metal decay. The main methods used are hot Galvanizing and electrogalvanizing.
Typical products: surface treatment for buildings, Bridges, vehicles and furniture
Output suitable for: single to large quantities
Quality: perfect protective layer, appearance depends greatly on the quality of steel
Speed: fast, basic 10 minutes/cycle
Applied materials
Because the galvanizing process depends on the metallurgical bonding technology, it is only suitable for the surface treatment of steel and iron




Electroplating process
Electroplating process: the process of making the surface of parts attached with a layer of metal film by electrolytic action, so as to prevent metal oxidation, improve wear resistance, electrical conductivity, reflection, corrosion resistance and improve the appearance of the role, many coins outer layer is also Electroplating.
Typical Products: Surface finish for vehicles, consumer electronics, furniture, jewelry and silverware, etc
Output suitable for: single to large quantities
Quality: high gloss, anti - oxidation corrosion
Speed: Medium speed, depending on material type and coating thickness
Applied materials
1. Most metals can be plated, but different metals have different levels of purity and plating efficiency.The most common of these are tin, chromium, nickel, silver, gold and rhodium (rhodium: a form of platinum that is extremely expensive and stays bright for long periods of time and is resistant to most chemicals and acids).It is most commonly used for products with high gloss requirements, such as trophies and MEDALS).
2. ABS is the most commonly used plastic for electroplating, because ABS can withstand 60°C (140°F) high electroplating temperature, and its electroplating and non-electroplating bonding strength is high.
3. Nickel metal should not be used to electroplate products that come into contact with the skin as it is irritating and toxic to the skin.



Powder coating
Powder Coating: it is a kind of dry spraying method, which is used on some metal workpiece by spraying or fluidized bed. Powder is adsorbed on the surface of workpiece by static electricity. When it is completely dried, a protective film will be formed on the surface
Typical Products: Spraying for vehicle, construction and white goods
Output suitable for: single to large quantities
Quality: the product surface is smooth and uniform
Speed: The speed depends on the workpiece size and degree of automation. It will take at least 30 minutes to dry
Applied materials
Powder spraying is mainly used to protect or color aluminum and steel, although it is suitable for some metal, plastic and glass surfaces.


Water transfer printing
Hydro Transfer Printing: A process in which colored patterns on Transfer paper are printed onto three-dimensional surfaces using water pressure.With the improvement of people's requirements for product packaging and surface decoration, water transfer printing is more and more widely used.
Typical products: vehicles, consumer electronics and military products, etc
Output suitable for: small to large quantities
Quality: the texture of the product surface is precise and clear, but there will be a slight stretch
Speed: high speed, 10-20 cycles/hour
Applied materials
All hard materials are suitable for water transfer, suitable for spraying materials must be suitable for water transfer.The most common are injection molding parts and metal parts.