一、electroplate:

Electroplating is a technology that makes the surface of the metal attached to a metal film to prevent corrosion, improve wear resistance, electrical conductivity, reflection, and enhance beauty.

Process flow: pretreatment no cyanide alkali copper no cyanide white copper tin chrome plating

Electroplating advantages:

1. High gloss of coating and high quality metal appearance;

2. The substrate is SUS, Al, Zn, Mg etc; the cost is low for PVD.

Electroplating Disadvantages:

Environmental protection is poor, and environmental pollution risk is greater.

二、anodic oxidation

Anodized oxidation: mainly anodized oxidation of aluminum, is the use of electrochemical principle, to generate a layer of Al2O (aluminum oxide) film on the surface of aluminum and aluminum alloy.This oxide film has the special characteristics of protective, decorative, insulation, wear resistance and so on.

characteristic:

1. Enhance the strength,

2. Realize any color except for white.

3. Realize nickel sealing holes to meet the requirements of nickel free in Europe and the United States and other countries.

Technical difficulties and key points:

The yield level of anodized oxidation is related to the cost of the final product. The focus of improving the oxidation yield is the suitable amount of oxidant, the suitable temperature and current density, which requires structural parts manufacturers to constantly explore and seek breakthroughs in the production process.

 三、cataphoresis

Electrophoresis: used for stainless steel, aluminum alloy, etc., can make the product present a variety of colors, and maintain the metal luster, while enhancing the surface performance, with good anti-corrosion performance.

Process flow: pretreatment electrophoresis drying

merit:

1. Rich in colors;

2. No metallic texture, and can match sand blasting, polishing, drawing, etc.;

3. Processing in the liquid environment can realize the surface treatment of complex structures;

4. The process is mature and available for mass production.

Disadvantages: the ability to cover up the defects is general, and the die-casting electrophoresis has high pretreatment requirements

四、Microarc oxidation

Microarc oxidation: the process of applying a high voltage to the electrolyte solution (the weak alkaline solution) generally to generate the ceramic surface mask layer, which is the result of the synergy of physical discharge and electrochemical oxidation.

Process flow: pretreatment with hot water washing and MAO drying

Technical advantages:

1. Ceramic texture, dark appearance, no highlight products, delicate feel, anti-fingerprint;

2. Extensive substrate materials: Al, Ti, Zn, Zr, Mg, Nb, and its alloys;

3. Simple pretreatment, excellent corrosion resistance, weather resistance, and good heat dissipation performance.

Disadvantages: at present, the color is limited, only black, gray and other more mature, bright colors are difficult to achieve at present; the cost is mainly affected by high power consumption, is one of the highest cost in surface treatment.

五、. PVD vacuum plating

Physical gas deposition (Physical vapor deposition, PVD): is an industrial manufacturing process, is mainly using physical processes to deposit thin film technology.

process flow:

PVD before cleaning furnace extraction target and ion cleaning coating finish, cooling after treatment (polishing, AFP)

technical feature:

The PVD (Physical Vapor Deposition, physical vapor deposition) can be coated on metal surfaces with a metal ceramic decorative coating with high hard plating and high wear resistance.

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