What are the advantages of D-SUB connectors?

I.What are the advantages of D-SUB connectors?1. Anti-corrosion function of connector coating: Most of the contact shrapnel of electrical connectors are made of copper alloy, which is easy to be corroded in the typical working environment of electrical connectors, such as oxidation and vulcanization. In fact, the contact coating is used to isolate the contact shrapnel from the working environment to prevent copper corrosion. Of course, the coating material must not be damaged (at least to a harmful extent) in its working environment. As an important function of corrosion protection, optimization of the interface is a consideration in the selection of a suitable contact coating material.2. Connector coatings contribute to mechanical properties: Parameters related to mechanical properties are mainly factors affecting the durability or wear and bonding of the coating. Important mechanical properties include the hardness, ductility and coefficient of friction of the coating material. All these properties depend on the inherent properties of the coating material and its processing.3. Connector coatings help to improve electrical performance: One of the main requirements for the electrical performance of connectors is to establish and maintain a stable connector impedance. For this purpose, a metallic contact interface is required to provide this inherent stability. The establishment of this contact interface requires a surface film that can be avoided or cracked during contact and mating. These two different options clarify the difference between precious or rare metals and common metals.4. Connectors are characterized by precious metal plating:Precious metal coatings (e.g., gold, palladium, and their alloys) are intrinsically free of the surface film to varying degrees. For these coatings, it is relatively simple to make metal contact at the interface, as it only requires that the partners of the contact surface move during mating. In order to maintain a stable impedance at the contact interface, connector design requires that the precious metals on the contact surfaces should remain unchanged to protect against contaminants, diffusion of the base metal, contact wear, and other external factors.5. Let the connector take advantage of the properties of ordinary metal plating:Ordinary metal coatings, especially tin or tin alloys, are naturally covered with a layer of oxidized film. The role of the tin contact coating is that this layer of oxidized layer is easily destroyed during mating, so that the metal contact is easy to establish. The requirements of electrical connector design is to ensure that the oxide film will rupture when the connector is mated, and the contact interface will not re-oxidize during the life of the electrical connector. Re-oxidizing corrosion in wear corrosion is the main mechanism for degradation of tin contact plating performance. Silver contact plating should be regarded as common metal plating as much as possible because it is susceptible to corrosion by sulfides and chlorides. Nickel plating is usually considered to be a common metal due to the classic formation of valves.

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