Metal Spraying is Suitable for the Electroplating Process of Large and Small Workpieces
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Metal Spraying is Suitable for the Electroplating Process of Large and Small Workpieces

Metal spraying is the process of spraying molten corrosion-resistant metal onto the metal surface with compressed air or inert gas to form a protective coating.
Published: May 04, 2022
Metal Spraying is Suitable for the Electroplating Process of Large and Small Workpieces

What is Metal Spraying?

Metal spraying, also known as Metallikon, is one of the methods of coating metal thin films on surfaces such as resins. Sputtering is to make accelerated ions collide with metal, and under the action of reaction force, the released metal atoms are attached to the surface of the resin. Since the energy of metal atoms is lower than that of vapor deposition, even a resin material with poor heat resistance can form a metal film with good stability on its surface. In addition, alloys and high-melting metal films can also be formed.

In metal spraying, the coating material is melted and atomized in a special spray sink or spray gun and sprayed onto the base material. This finishing method is also called metal spraying. Oxyacetylene flames are generally used, but other gases are sometimes used. When the coated wire is automatically fed through the flame core, the wire is melted and at the same time atomized and sprayed onto the base material by the compressed airflow. Metallization can be used on almost any metal that can be made into wire. Another type of spray gun uses powdered material to be sprayed through a flame. The advantage of this method is that it cannot only spray metals but also metal-ceramic composites, oxides, and cemented carbides.

Preparations Before Metal Spraying (Metallikon):

Since the bond between the coating material obtained by metallization and the base material is purely mechanical, the base material must be properly pretreated. To obtain a good mechanical bond. Regardless of the surface preparation method used, the substrate surface must be clean and free of oil.

The most common method of surface preparation is sandblasting. The grit is sharp enough to produce a truly rough surface. For cylindrical surfaces that can be turned on a lathe, it is effective to machine a very coarse thread and then roll it lightly with a roller cutter. crest of teeth. Another improvement that can be used for flat surfaces is to use an around grooving knife to cut a series of parallel grooves and then use a knurling knife to grab the facets between the grooves. If the plated surface requires subsequent machining, the substrate surface should be prepared by roughing or grooving for best preparation.

What are the Applications of Metal Spraying?

Metallization has many important uses in product design. Protective coatings such as zinc and aluminum are sprayed onto steel surfaces for corrosion resistance. Because metallization can metalize almost any metal or non-metallic surface, it provides a method of coating a poorly conducting or non-conducting surface with a conductive surface, for which copper or silver is often sprayed onto glass or on plastic. Since metallization can be treated in a variety of ways, such as polishing, brushing, or leaving the sputtered state, metallization can be used as a decorative solution in the product and construction industries.

The Working Principle and Process of the Spray Coating Process:

  1. Degreasing treatment: clean with acetone or alcohol.
  2. Surface treatment: corona discharge treatment, ultraviolet irradiation treatment, etc.
  3. Bottom surface coating/hardening treatment: The bottom surface coating process can improve the adhesion between the resin and the spray coating. The bottom surface coating and hardening treatment are only preparations before coating, especially for materials with poor adhesion to coatings such as steel, the wettability of the material can be improved by surface treatment.
  4. Sputtering process: The materials used for the electrodes are Al, SUS304, etc.
  5. Surface coating/hardening treatment: The surface coating is transparent. Like the bottom coating, it is coated and cured by the same process as the coating.

What Metal Spraying Processes are there?

Vacuum metal spraying process:

The vacuum coating process is a physical method of plating metal onto a substrate, not a chemical method. Coating takes place in a vacuum chamber, where the metal is melted and becomes gaseous when it reaches its vaporization point. The gaseous molecules travel along the line of sight and then condense on the target substrate, forming a relatively uniform coating. The vacuum system contains a sealed chamber where the coating process takes place. Outside the enclosure, there are multiple pumps pumping air out to the pressure required for the process. A power source supplies the required voltage to an electrode connected to a series of insulators containing tungsten filaments that carry the metal to be evaporated. There are eight to ten major steps in the vacuum metallization process. Generally, a spray coating takes 2 to 3 hours to complete.

Substrates suitable for vacuum metallization include metals (tin, steel, aluminum, etc.), plastics (ABS, polypropylene, styrene, etc.), and glass. To obtain a perfect, flawless coating, the raw substrate surface must be free of contamination such as release agents, fingerprints, dirt, dust, oil, and grease.

Nano spray:

Nano-sprayed spray products have better adhesion, impact resistance, corrosion resistance, weather resistance, wear resistance, and scratch resistance, and have good anti-rust performance. It is generally used for surface treatment of precision products such as large automobile manufacturers and large electrical appliance manufacturers, and can also be used for surface decoration and protection spraying in other industries.

The working principle of nano-sputtering is the silver mirror reaction, a process in which the silver ammonia solution is sprayed on the surface of the workpiece with a spray gun. It is silver after spraying, and then the protective solvent is added to the surface to form different colors. The advantage of nano-sputtering is that based on the electroplating effect, it also has water resistance, corrosion resistance, acid and alkali resistance, weather resistance and safety, and excellent hardness. Compared with traditional electroplating, it will not cause pollution to the environment. Nano-spraying has certain limitations, and it is best to be used in finishing and avoiding high-pressure friction workpieces.

Published: May 04, 2022 Source :kknews, Source :read01

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