Ten methods of metal surface treatment such as anodize,vacuum plating...|www.easoar-soon.com
By jett NG | 17 August 2021 | 0 Comments

Ten methods of metal surface treatment such as anodize,vacuum plating...|www.easoar-soon.com

Ten methods of metal surface treatment such as anodize,vacuum plating...|www.easoar-soon.com

 

First, anodic oxidation|anodize

 

Mainly is the anodic oxidation of aluminum,aluminium anodize is the use of electrochemical principle, in the surface of aluminum and aluminum alloy to generate a layer of Al2O3 (alumina) film. This layer of oxide film has protective, decorative, insulation, wear resistance and other special characteristics.

 

Process flow:

 

Monochrome, gradient color:

 

Polishing/sandblasting/wire drawing → degreasing → anodizing → neutralizing → dyeing → sealing → drying

 

Double color:

 

(1) polishing/sandblasting/drawing → degreasing → shielding → anodic oxidation 1→ anodic oxidation 2 → hole sealing → drying

 

② polishing/sandblasting/wire drawing → oil removal → anodic oxidation 1 → radium carving → anodic oxidation 2 → hole sealing → drying

 

Technical features:

 

1, lifting intensity

 

2. Implement any color except white

 

3, Ni-free sealing hole, to meet the requirements of Europe, the United States and other countries without nickel

 

Technical difficulties and key improvement points:

 

The yield level of anodic oxidation is related to the cost of the final product. The key to improve the yield is the appropriate dosage of oxidizing agent, the appropriate temperature and the current density, which requires the manufacturers of structural parts to continuously explore in the production process and seek for a breakthrough.

 

Product Recommendation:

 

E+G arc handle, anodized material, environmental protection, durable.

 

Second, the electrophoresis

 

Used in stainless steel, aluminum alloy, etc., can make the product show a variety of colors, and maintain the metallic luster, and enhance the surface performance, has a good anti-corrosion performance.

 

Process flow:

 

Pre-treatment → electrophoresis → drying

 

Advantages:

 

1. Rich in color;

 

2, no metal texture, can be matched with sandblasting, polishing, wire drawing, etc.

 

3, processing in liquid environment, can realize the surface treatment of complex structure;

 

4, mature technology, can be mass production.

 

Disadvantages:

 

The ability to cover defects is not good, and the electrophoresis of die casting requires higher pretreatment.

 

Three, micro-arc oxidation

 

The process by which a high voltage is applied in an electrolyte solution (usually a weakly alkaline solution) to generate a ceramic surface film. The process is the result of a synergistic effect of physical discharge and electrochemical oxidation.

 

Process flow:

 

Pre-treatment → hot water washing → MAO → drying

 

Advantages:

 

1. Ceramic texture, dark and dumb appearance, no highlight products, fine feel, anti-fingerprint;

 

2, a wide range of substrate: Al, Ti, Zn, Zr, Mg, Nb, and its alloy;

 

3, simple pretreatment, product corrosion resistance, excellent weather resistance, good heat dissipation performance.

 

Disadvantages:

 

At present, the color is limited, only black, gray and other mature, bright color is difficult to achieve at present; The cost is mainly affected by the high power consumption, which is one of the highest cost of surface treatment.

 

IV. PVD vacuum plating

 

Physical vapor deposition is an industrial manufacturing process that mainly uses physical processes to deposit thin films.

 

Process flow:

 

Cleaning before PVD → vacuuming into furnace → cleaning target and ion → coating → coating end, cooling out → post-treatment (polishing, AFP)

 

Technical features:

 

Physical Vapor Deposition (PVD) can be used to coat metal surface with high hard plating and high wear resistance ceramic decorative coating

Five, electroplating

 

Is the use of electrolysis to make the surface of the metal attached to a layer of metal film process so as to prevent corrosion, improve wear resistance, electrical conductivity, reflective and enhance the role of a beautiful technology.

 

Process flow:

 

Pretreatment → cyanide-free alkali copper → cyanide-free white copper tin → chromium plating

 

Advantages:

 

1, the coating gloss is high, high quality metal appearance;

 

2. SuS, Al, Zn, Mg, etc.; The cost is lower than PVD.

 

Disadvantages:

 

The environmental protection is poor and the risk of environmental pollution is large.

 

Six, powder spraying

 

Is the use of powder spraying equipment (electrostatic spray molding machine) powder coating sprayed to the surface of the workpiece, under the action of static electricity, powder will be uniformly adsorbed on the surface of the workpiece, the formation of powder coating; The powder coating is baked and leveled at high temperature to become a final coating with different effects (different kinds of effects of powder coating).

 

Process flow:

 

The upper part → electrostatic dust removal → spraying → low temperature leveling → baking

 

Advantages:

 

1, Rich color, high gloss, matte optional;

 

2, the cost is low, suitable for building furniture products and heat sink shell;

 

3, high utilization rate, 100% utilization, environmental protection;

 

4. Strong ability to shelter defects; 5, can imitate the effect of wood grain.


Disadvantages:

 

At present, it is less used in electronic products.

 

Seven, metal wire drawing

 

It is a kind of surface treatment means to form lines on the workpiece surface by grinding products and play a decorative effect. According to the different lines after drawing can be divided into: straight line drawing, drawing, ripple, swirl.

 

Technical features:

 

The drawing process can give the metal surface a non-mirror-like metallic luster, and the drawing process can also eliminate subtle defects on the metal surface.

 

Product Recommendation:

 

LAMP handle, ZWEI L treatment, using excellent grinding technology, show taste.

 

Eight, sandblasting

 

It uses compressed air as the power to form a high-speed jet beam to spray the jet material to the workpiece surface to be processed at a high speed, so that the appearance or shape of the outer surface of the workpiece surface changes, obtain a certain degree of cleanliness and different roughness of a process.

 

Technical features:

 

1, achieve different reflective or sub-light.

 

2, can clean the workpiece surface of the tiny burr, and make the workpiece surface more smooth, eliminate the harm of burr, improve the grade of the workpiece.

 

3, clear the residual residue left before processing, improve the finish of the workpiece, can make the workpiece reveal uniform metal color, make the workpiece appearance more beautiful, beautiful.

 

Product Recommendation:

 

E+G classic bridge handle, sandblasted surface, high-end atmosphere and grade.

 

Nine, polishing

 

The use of flexible polishing tools and abrasive particles or other polishing media to modify the workpiece surface. For different polishing processes: rough polishing (basic polishing), medium polishing (finishing) and fine polishing (finishing), the appropriate polishing wheel can achieve the best polishing effect and improve the polishing efficiency.

 

Process flow:

 

Technical features:

 

Improve the dimensional accuracy or geometric accuracy of the workpiece, get a smooth surface or mirror gloss, but also can eliminate gloss.

 

Product Recommendation:

 

E+G long handle, polished surface, simple and elegant

 

Ten, etching

 

Usually referred to as etching, also known as photochemical etching, refers to the exposure of plate making, development, will be etched area of the protective film removal, in the etching contact with chemical solution, to achieve the effect of dissolution and corrosion, the formation of concave or hollow molding effect.

 

Process flow:
 

 

Exposure method:

 

Engineering according to the figure out of the material size - material preparation - material cleaning - drying - film or coating - drying - exposure - development - drying - etching - film removal - OK

 

Screen printing method:

 

Open material → cleaning plate (stainless steel other metal materials)→ screen printing → etching → stripping →OK

Advantages:

 

1, can carry on the metal surface fine processing;

 

2, give a special effect to the metal surface;

 

Disadvantages:

 

Etching the use of corrosive liquids (acid, alkali, etc.) are mostly hazardous to the environment.

 

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