Metal surface treatment-Custom sheet metal fabrication stamping service company -Fuyou inc

Science and technology

Metal surface treatment

Leading machinery, automotive, processing technology, 3d printing, automation, robotics, production processes, bearings, molds, machine tools, sheet metal and other industries leading edge
ANODIC oxidation
ANODIZING: mainly the anodizing of aluminum, is the use of electrochemical principle, in the aluminum and aluminum alloy surface to form a layer of alumina film. The oxide film has the special properties of protection, decoration, insulation and wear resistance.
Process flow:
Monochrome, gradual change color: Polishing / sandblasting / drawing → degreasing → anodizing → neutralization → dyeing → sealing → drying
Two Colors: 1 Polishing / sandblasting / drawing → deoiling → masking → anodizing 1→ anodizing 2→ sealing → drying
2 Polishing / sandblasting / drawing → deoiling → anodizing 1→ radium carving → anodizing 2→ sealing → drying

Technical Features:
1. Increase intensity,
2. Implement any color except white.
3. Realizing nickel-free sealing to meet the requirements of countries such as Europe and America.

Technical difficulties and key improvement points:
The yield level of anodizing is related to the cost of the final product. The key to improve the yield is the proper amount of oxidant, the proper temperature and current density, looking for a breakthrough.
Electrophoretic ED-Electrophoresis disposition
ELECTROPHORESIS: used in stainless steel, aluminum alloy, etc. , can make products appear a variety of colors, and maintain metal luster, while enhancing surface properties, with good corrosion resistance.
Process flow: pretreatment → electrophoresis → drying
Technical Features:
Pros:
1. Rich colors
2, no metal texture, can cooperate with sandblasting, polishing, drawing and so on;
3. Processing in liquid environment, surface treatment of complex structure can be realized
4, mature process, can be mass-produced.
CONS:
The ability to cover up defects is general, and the pre-treatment of die castings for electrophoresis is required.
MICROARC oxidation of Mao
MICRO-ARC OXIDATION (Mao) : the formation of ceramic surface layer in electrolyte solution (generally weak alkaline solution) under high voltage, which is the result of the synergistic action of physical discharge and electrochemical oxidation.
Process flow: PRETREATMENT → hot water washing → Mao → drying
Technical Features:
Pros:
1. Ceramic Texture, dark appearance, no bloom products, feel delicate, anti fingerprint;
2, the base material is widespread: AL, TI, Zn, Zr, MG, NB, and its, alloy and so on;
3, Simple pre-treatment, corrosion resistance, excellent weather resistance, good heat dissipation performance.
CONS:
At present, color is limited, only black and gray are more mature, bright color is difficult to achieve; the cost is mainly affected by high electricity consumption, is one of the highest costs of surface treatment.
PVD vacuum plating
Physical Vapor Deposition: Physical Vapor Deposition (PVD) is an industrial manufacturing process in which thin films are deposited primarily by Physical processes.
Schematic of PVD principle
Process flow:
PVD PRE-CLEANING → furnace vacuum → target and ion cleaning → coating → coating end, cooling out → post-treatment (polishing, AFP)
Technical Features:
PVD (Physical Vapor Deposition) Physical Vapor Deposition can be applied to metal surfaces with a cermet decorative coating of high hardness and high wear resistance

Electroplating
ELECTROPLATING: The use of electrolytic action on the surface of the metal attached to a layer of metal film to prevent corrosion, improve wear resistance, conductivity, reflectivity and improve the appearance of a technology.
Process flow:
PRETREATMENT → cyanide-free Alkaline Copper → cyanide-free Cupronickel Tin → chromium plating
Technical Features:
Pros:
1. High Gloss coating, High Quality Metal Appearance;
2. The substrate is Sus, AL, Zn, MG etc. . The cost is lower than PVD.
CONS:
Environmental protection is poor and the risk of environmental pollution is high.
Powder coating
Powder coating: the powder coating is sprayed to the surface of the work piece by the powder spraying equipment (electrostatic spraying machine) . Under the action of static electricity, the powder will be evenly adsorbed on the surface of the work piece to form a powder coating, a final coating that produces a variety of effects (different kinds of effects in powder coatings) .
Process flow:
Top piece → electrostatic precipitation → spraying → low temperature leveling → baking
Technical features:
Pros:
1. Color Rich, bloom, Matte Optional;
Low cost, suitable for shell of building furniture products and heat sink, etc.
High Utilization Rate, 100% utilization, environmental protection;
4, strong ability to cover defects; 5, can copy the wood grain effect.
Metal wire drawing
Wire drawing: It is a kind of surface treatment method that can form the line pattern on the surface of the work piece through the grinding product and have the decorative effect. According to the drawing after the different lines can be divided into: straight wire drawing, random wire drawing, ripple, twist.
Technical Features:
The non-specular metallic luster can be obtained by wire drawing, and the fine defects can be eliminated by wire drawing.
Sandblasting
Sand blasting: The use of Compressed air as the power to form a high-speed jet jet jet jet jet to the surface of the workpiece to be processed, so that the surface of the workpiece surface appearance or shape change, a process for obtaining a certain degree of cleanliness and a different degree of roughness.
Technical Features:
1. Achieve Different reflections or mattes.
2, can clean the workpiece surface tiny burr, and make the workpiece surface more even, eliminate the harm of Burr, improve the quality of the workpiece.
3, Clear pre-treatment of residual pollution, improve the workpiece finish, can make the workpiece exposed uniform metal color, make the workpiece appearance more beautiful, good-looking.
9. Polishing
POLISHING: The use of flexible polishing tools and abrasive particles or other polishing media on the surface of the workpiece surface finishing.
According to different polishing process: rough polishing process, medium polishing process and fine polishing process, the best polishing effect can be obtained by selecting proper polishing wheel, and the polishing efficiency can be improved.
Process flow:
Technical Features:
Improving the size precision or geometric shape precision of the workpiece, to obtain a smooth surface or specular gloss, but also can eliminate gloss.
Etch
ETCHING: Commonly referred to as photochemical etching, refers to the process of exposure plate-making, development, the area to be etched to remove the protective film, in etching contact with chemical solution, to achieve the role of dissolution of corrosion, the effect of forming a bump or hollow out.
Process flow:
Exposure method: According to the drawing, the size of material preparation-material preparation-material cleaning-drying → film or coating → drying → exposure → development → drying-etching → stripping → OK
SCREEN PRINTING: cutting → cleaning plate stainless steel other metal materials → screen printing → etching → stripping → OK
Technical Features:
Pros:
1, can carry on the metal surface fine processing;
2. Give the metal surface special effect
CONS:
The corrosive liquid (acid, Alkali, etc.) used in etching mostly do harm to the environment.

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