Salt spray testing is commonly used in underwater environments and is commonly used to assess the corrosion resistance of metal connector housings by checking insulation resistance to confirm the properties of exposed parts and to determine that the housing seals are effective.
Salt spray testing is also sometimes used in the evaluation of automotive connector mold factories, where a car or truck may be in contact with water splashing on tires while walking, especially after snow in the northern winter when salt is applied to roads to speed up snow melting. These connectors are usually tested with salt spray to verify their corrosion resistance. The criterion for verification is also to check the reliability of the contact resistance, not by checking its appearance. Most of the time these connector molds are processed with the sealing ring to improve its salt spray resistance.
These are all special cases of connectors that come in direct contact with harsh environments. Connectors are commonly used in protected areas within buildings or transport vehicles where salt spray testing is not required. In these applications, for the application of precious metal coatings, the common failure mechanisms are pore corrosion and corrosion creep, which are assessed by MFG tests. Fretting corrosion is the main failure mechanism of non-noble metal coatings. Vibration and high frequency temperature and humidity cycle tests are used to evaluate the failure mechanism.
Salt spray environments are primarily application environments used in military and special equipment automotive and Marine applications. Under normal circumstances, salt spray environment refers to the salt spray environment formed by 5% salt solution, which can be used for effective evaluation of equipment or components directly exposed to sea and land salt environment. For applications in a protected environment, it is not a real environment. Normal exposure time is between 48 and 96 hours.
Salt spray tests are sometimes used to evaluate electrochemical corrosion failures of copper-aluminum connections. Since electrochemical corrosion is protected by isolation from external air, the purpose of salt spray tests is to verify the effectiveness of this isolation protection.
Salt is a highly corrosive material and coats a variety of connector systems, including both noble and non-noble metal plating failures. If the salt spray test is to be carried out in the original application environment, it is very suitable for connector failure to occur during the test. The purpose of the salt spray test is to evaluate the performance of the product, not to cause total damage. Salt spray test is applicable to the evaluation of connectors used in Marine environments.
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