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Protective layer of metal material for spring thimble.silver thimble factory

source:Industry News    Popular:pogo pin for moilble phone     release time:2021-11-19 09:18:58     Article author:sznbone

  Protective layer of metal material for spring thimble.silver thimble factory(图1)

  There are many types of protective layers of metal materials. In terms of springs, gold plating is generally used to obtain the protective layer of metal materials. The protective layer of the electroplating process can not only be protected from corrosion, but at the same time can improve the appearance of the spring. There are some electroplating metal materials that can also improve the working characteristics of the spring, such as improving the surface strength, improving abrasion resistance, improving heat resistance, and avoiding radiation corrosion. But if it is purely to better the corrosion of the spring, the phosphating layer and the cadmium layer of electroplating process should generally be used.

  Zinc is relatively stable in dry air, hardly changes, and does not fade easily. In the humid and cold air, it will be transformed into a layer of milky white plastic film of active zinc oxide or carbon zinc carbonate. This high-density plastic film can prevent corrosion again. Therefore, the hot-dip galvanized layer is used as a corrosion protection layer for the spring under the general air standard. All springs that come into contact with aqueous solutions such as hydrochloric acid, sulfuric acid, and anhydrous aluminum chloride, and springs that work in humid and cold air such as sulfur trioxide, are not suitable for zinc coating.

  Generally, the hot-dip galvanized layer is passivated by stainless steel, and the passivation treatment can improve the maintenance characteristics of the coating and enhance the appearance of the surface.

  In oceanic climates or high-temperature air, and springs in contact with the sea, springs used in 70°C boiling water have relatively stable cadmium and strong corrosion resistance. Cadmium coating is brighter and more beautiful than zinc coating, softer, better ductile than zinc, and less alkali-brittle. It is most suitable for spring as a protective layer. However, cadmium is scarce, expensive, and cadmium salt has great side effects, which is very harmful to air pollution. Therefore, it is limited in application. Therefore, most of the springs commonly used in airlines, ocean shipping and electronics industries use cadmium plating as a protective layer.

  In order to better improve the corrosion resistance of the cadmium coating, stainless steel passivation can be carried out after plating.

  The thickness of zinc and cadmium coatings determines how much maintenance work capacity is. The size of the thickness should generally be selected according to the office environment during application. The strength of the hot-dip galvanized layer is strongly recommended to be selected in the range of 6~24μm; the thickness of the cadmium layer is strongly recommended to be selected in the range of 6~12μm.


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