Salt spray environment test of coaxial connector
The salt spray environment mainly refers to the application environment used in military and special vehicles and marine applications. The salt spray environment under normal conditions refers to a salt spray environment formed by a 5% salt solution, which is generally used to effectively evaluate coaxial connectors in environments such as salt directly exposed to the ocean or land. For applications in a protected environment, it is not a real natural environment. The normal exposure time is between 48 hours and 96 hours.
Salt spray testing is commonly used in marine environments and is commonly used to evaluate the corrosion resistance of metal connector housings (such as verifying the corrosion protection of nickel coatings on zinc alloy die-cast parts). Determining exposed parts by verifying DWV and insulation resistance. The performance to clarify the housing seal is effective.
Salt spray testing is sometimes also used for the evaluation of connectors for automotive applications. When a car or truck is walking, the part to which the connector belongs may be exposed to splashed water on the tire, especially after snowing in winter in the northern region. Salt to accelerate the melting of snow. Such connectors are typically subjected to a salt spray test to verify their corrosion resistance. The standard of verification is also to verify the reliability of the contact resistance, and not to verify the appearance by inspection. Many times these connectors are used with a sealing ring to improve its salt spray resistance.
Salt spray testing is also sometimes used as a coaxial connector for evaluating aerospace applications, such as accessories for internal landing gear, which may also be exposed to salt-laden water or other potentially corrosive chemicals. Some of its other uses are for connectors installed in coastal/coastal environments where salt spray is present in the air.
All of the above are all special cases of connectors that are in direct contact with extreme natural environments. Connectors are typically used inside buildings or in protected areas of transport vehicles such as cars, where salt spray testing is not required in such environments. In this application, the common failure mechanisms for precious metal coating applications are pore corrosion and corrosion creep, which are evaluated by MFG (mixed gas streams such as HCl, SO2, H2S, etc.). For contact interfaces of non-noble metal coatings, the primary failure mechanism is fretting corrosion, which is evaluated based on vibration and high frequency temperature and humidity cycling tests.
Salt spray testing is sometimes used to assess the electrochemical corrosion failure of copper-aluminum connections. Since electrochemical corrosion is protected by means of blocking outside air, the purpose of the salt spray test is to verify the practical effect of such isolation protection.
Salt spray is highly corrosive to many materials and has been identified as causing failure of various connector coating systems, including precious and non-precious metal coatings. If the test is carried out with salt spray, the connector that was originally suitable for the application environment will fail during the test. The purpose of the salt spray test is to evaluate the performance of the product without damaging it.
The salt spray test is applicable to the evaluation of the connector for the marine environment. The specifications for the salt spray test are EIA 364-26. The properties of salt spray measurement are mostly appearance inspection and weight detection and resistance measurement. The actual test content and evaluation method are not mentioned here.
It should be noted that there have been many misunderstandings about the use of salt spray. Many companies use salt spray for the inspection of the tin-plated products of the connector terminals, and the property of the monitoring is the appearance inspection. This is a very serious wrong way.
First of all, these inspected connectors may not be in contact with the salt or marine environment at all, and these products may be installed in a protected environment, in which case the use of salt spray tests does not show up. A consistent application of the effect.
Second, the tin-plated product itself has an oxide film on its surface, and its main failure mechanism is fretting corrosion after compounding. In this case, the salt spray test has no relationship with its failure mechanism. Even if the oxide layer on the surface of the salt spray test becomes black, in actual use, the electrode can be easily pushed off by the matching terminal and contacted with the pure tin inside to form a metallic connection.
Third, there is no acceleration factor for the salt spray test. The salt spray after 48 hours does not represent how many years the product can be used under certain circumstances.
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