What are the advantages and disadvantages of arc spraying metal coatings, overview of application 20

Hello, the advantages of Zibo Xufa Industry and Trade Arc Spraying Machine are introduced.

A new type of inverter arc spraying machine to overcome the shortcomings of poor performance and weak adaptability of the current ordinary transformer tap arc spraying equipment. The system consists of three parts: the main power supply, the enclosed spray gun and the wire feeding device. The inverter main power supply adopts full-bridge conversion circuit and pulse width modulator, and has the functions of over-voltage, under-voltage, over-current and over-temperature protection; At the same time, the control circuit is also designed with electronic reactor, network voltage fluctuation compensation and current cut-off negative feedback link, so that the main power supply has good dynamic characteristics and regulation performance.

The inverter supersonic arc spraying machine adopts the working principle of IGBT clamp absorption circuit to facilitate the selection of more optimized circuit parameters, and designs a PCB with a tighter structure and smaller lead inductance to further improve the stability of the system.

XF-630A inverter arc spraying machine features: maximum output current of 630A, small size, light weight, high power, good performance, easy operation, high reliability, strong adaptability, fast wire feeding speed, high spraying efficiency, has high application value.

(1) High thermal efficiency (2) High production efficiency (3) High coating bond strength (4) Low production cost (5) Simple operation, safe and reliable.

Compared with flame spraying, arc spraying has the following characteristics: High thermal efficiency, and the self-consumption rate of heat energy can be as high as 60% 70%. The coating has high bonding strength, and the bonding strength of the coating and the substrate is higher than that of flame spraying.

Alloy coatings or "pseudo-alloy" coatings can be easily manufactured. The spraying efficiency is high, the cost is low, and the cost of arc spraying can be reduced by more than 30% compared with flame spraying.

Since it is fed at the same time, the spraying efficiency is also high. Arc spraying has obvious deficiencies, and the spraying material must be a conductive welding wire, so only metal can be used, and ceramics can not be used, which limits the application range of arc spraying.

Not exactly the same concept. Arc spraying is just one of the more commonly used thermal spraying processes.

Thermal spraying is a process in which the coating material is heated and sprayed onto the surface of the workpiece to solidify to form a functional coating. According to the different heat sources, thermal spraying is divided into arc spraying, flame spraying, plasma spraying, spraying and other processes, and is currently commonly used in steel structure anti-corrosion engineering is flame spraying aluminum and arc spraying aluminum. Due to the advantages of high efficiency, strong adhesion and low porosity of coating, arc spraying method is generally recommended for the anti-corrosion engineering design of aluminum spraying or AS aluminum alloy, and it is rarely recommended to use flame spraying method.

Arc spraying is one way to achieve this with thermal spraying technology.

The so-called thermal spraying is the use of a certain heat source, such as electric arc, plasma arc, combustion flame, etc., to heat powder or filamentous metal and non-technical coating materials to a molten or semi-molten state, and then atomize with the power of the flame flow itself or the additional high-speed air flow and spray to the surface of the pretreated matrix material at a certain speed, and combine with the matrix material to form a surface covering coating. (You probably know that!) ）

Do you want to ask, the difference between flame spraying and arc spraying?

1. Flame spraying: It is a method of using the combustion flame of oxygen and acetylene to heat the powdered or filamentous coating material to a molten and semi-molten state, and then spray it with dry compressed air to the surface of the substrate to form a coating.

2. Arc spraying: It is a method of generating an arc between two filamentous technical materials, and the heat generated by the arc melts the metal wire, and the melted part is atomized by the compressed air flow and sprayed on the surface of the substrate to form a coating.

The above information hopes to help you.

Arc spraying is a kind of thermal spraying, which includes many spraying methods, such as plasma spraying, supersonic flame spraying, ** spraying, etc. Arc spraying is a relatively common thermal spraying method at present.

Thermal spraying includes arc spraying.

When an engineering problem is raised, it should first be clear what kind of working conditions are in the part of the workpiece to be sprayed (usually the working surface of the equipment or facility), and the coating function is the main basis for determining the spraying process and materials, and whether it is economically permissible should also be considered, and the relationship between them is shown in Figure 3.

1 Diversity of coatings.

The diversity of coatings is due to the wide choice of coating materials, the controllable process parameters and the variable application method. There are more than 100 kinds of spraying powder materials, dozens of wires and rods, and different spraying methods and process parameters can make the same material form different coatings. In this way, the combination of these variables results in a set of a menu of coatings that you can simply choose from when you need a coating with certain characteristics.

2 Coating Categories.

The coating made by spraying materials can be divided into 10 series according to their composition;

1) Iron, nickel and cobalt-based coatings;

2) Self-fusing alloy coating;

3) Non-ferrous metal coating;

4) Oxide ceramic coating;

5) tungsten carbide coating;

6) chromium carbide and other carbide coatings;

7) Refractory metal coating;

8) Oxide ceramic coating;

9) Plastic-based coating;

10) Cermet coating.

3 Coating function.

According to the classification method of thermal spray coatings in the United States [4], coatings can be divided into the following according to their functions

Abrasion-resistant coating.

These include anti-adhesive wear, surface fatigue wear coatings, and erosion resistant coatings. In some cases, there are also anti-low temperature (< 538) abrasion and anti-high temperature (538 843) abrasion coatings.

Heat-resistant and anti-oxidation coating.

These coatings include coatings applied to high-temperature processes (with oxidizing atmospheres, corrosive gases, erosion and thermal barriers above 843) and molten metal processes (with molten zinc, molten aluminum, molten iron and steel, molten copper).

Anti-atmospheric and impregnated corrosion coatings.

Atmospheric corrosion includes corrosion caused by industrial atmosphere, saline atmosphere, field atmosphere, etc.; Impregnation corrosion includes corrosion caused by drinking fresh water, non-drinking fresh water, hot fresh water, salt water, chemicals, and food processing.

Conductivity and resistance coatings.

This coating is used for conductivity, resistance, and shielding.

Restore the dimensional coating.

This coating is used for iron-based (machinable and grindable carbon and corrosion-resistant steels) and non-ferrous metals (nickel, cobalt, copper, aluminum, titanium and their alloys).

Mechanical component gap control coatings.

The coating is grindable.

Chemically resistant coating.

Chemical corrosion includes the corrosion of various acids, alkalis, salts, various inorganic substances and various organic chemical media.

Among the above-mentioned coating functions, the wear-resistant coatings, heat-resistant and anti-oxidation coatings and chemical-resistant coatings are closely related to the production of metallurgical industry.

Thermal spraying is a series of processes in which the sprayed material is heated with some form of heat source, and the heated material forms molten or semi-molten particles, which impact and deposit on the surface of the substrate at a certain velocity to form a spray coating with certain characteristics. The entire process of thermal spray technology is shown in Figure 1.

Arc spraying is a technology that uses an electric arc that burns between two continuously fed metal wires to melt metal, atomizes the molten metal with high-speed air flow, and accelerates the atomized metal particles to spray them onto the workpiece to form a coating.

The four Fe-based coatings of F1 and F4 were prepared by arc coating, and the abrasive wear test was carried out by rubber wheel wear testing machine, and the phase structure and wear mechanism of the coating were studied. The results show that the wear resistance of the coating mainly depends on the phase distribution in the coating, and is not linearly related to the hardness of the coating. The mechanism of arc spraying FE-based coating is that the substrate with low hardness wears first under the condition of abrasive wear, and the hard phase with high hardness plays a role in preventing the wear of quartz sand and greatly reduces the wear of the coating.