There are many ways to treat the surface of tungsten needles. The following are some common treatment methods:
1. Mechanical polishing
Mechanical polishing is a treatment method that uses mechanical means such as grinding and polishing to remove the rough part of the surface of the tungsten needle and make the surface smooth and delicate. The specific steps are as follows:
1. Rough grinding: Use coarse-grained sandpaper or grinding stone to grind off the rough part of the surface of the tungsten needle.
2. Fine grinding: Use fine-grained sandpaper or grinding stone to polish the surface of the tungsten needle.
3. Polishing: Use polishing cloth, polishing paste and other materials to polish the surface of the tungsten needle to a mirror smooth surface.
Mechanical polishing can effectively improve the smoothness and corrosion resistance of the tungsten needle surface, and also enhance the conductivity of the tungsten needle. However, a certain amount of heat will be generated during mechanical polishing, which may affect the accuracy and size of the tungsten needle.
2. Chemical corrosion treatment
Chemical corrosion treatment is a treatment method that uses chemical reactions to remove substances such as oxide layers and impurities on the surface of the tungsten needle. The specific steps are as follows:
1. Cleaning: Clean the surface of the tungsten needle and remove oil stains, impurities, etc. on the surface.
2. Corrosion: Put the tungsten needle into the corrosive solution and use chemical reaction to remove the surface oxide layer, impurities and other substances.
3. Cleaning: Take the tungsten needle out of the corrosive solution, clean it and dry it.
Chemical corrosion treatment can effectively remove the oxide layer, impurities and other substances on the surface of the tungsten needle, and improve the conductivity and corrosion resistance of the tungsten needle surface. However, during the chemical corrosion treatment, it is necessary to pay attention to controlling the concentration and temperature of the corrosive solution to avoid affecting the size and precision of the tungsten needle.
3. Electrochemical polishing
Electrochemical polishing is a treatment method that uses electrochemical principles to make the surface of the tungsten needle smoother and more delicate through the action of current in the electrolyte. The specific steps are as follows:
1. Preparation: Put the tungsten needle into the electrolyte and connect the power supply.
2. Power on: After the power is turned on, the ions in the electrolyte move under the action of the electric field and form a thin film on the surface of the tungsten needle.
3. Polishing: Under the action of the current, the thin film on the surface of the tungsten needle gradually dissolves, and the surface becomes smoother and more delicate.
4. Cleaning: Take the tungsten needle out of the electrolyte, clean it and dry it. Electrochemical polishing can effectively improve the smoothness and corrosion resistance of the tungsten needle surface, and also enhance the conductivity of the tungsten needle. However, during the electrochemical polishing process, it is necessary to pay attention to controlling parameters such as current, voltage, and electrolyte concentration to avoid affecting the size and precision of the tungsten needle.
4. Coating treatment
Coating treatment is a treatment method that coats a thin film on the surface of the tungsten needle to improve its corrosion resistance, wear resistance, conductivity and other properties. Common coating treatments include gold plating, silver plating, zinc plating, etc. The specific steps are as follows:
1. Pretreatment: Clean the surface of the tungsten needle to remove oil, impurities, etc.
2. Coating: Put the tungsten needle into the coating solution and form a thin film on the surface through chemical reaction or physical deposition.
3. Post-treatment: Take the tungsten needle out of the coating solution, clean it and dry it.
Coating treatment can effectively improve the corrosion resistance, wear resistance, conductivity and other properties of the tungsten needle surface, and also enhance the appearance of the tungsten needle. However, during the coating process, it is necessary to pay attention to controlling the concentration, temperature, current and other parameters of the coating solution to avoid affecting the size and accuracy of the tungsten needle.
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