The role of salt spray test chamber

Update date:2018-05-10 Source:MAXGE

The role of salt spray test chamber

First, the importance of salt spray test chamber

        The salt spray test box for salt spray test is an important means to evaluate the salt spray corrosion resistance of products or materials. The scientific and rationality of the test results is very important. There are many reasons that affect the stability and consistency of salt spray test results. Therefore, to improve the effectiveness of salt spray test results, it is necessary to improve the test technology. Therefore, testers need to have not only solid professional knowledge and expertise, but also rich practical experience and comprehensive understanding of the product.

   Understanding the salt spray test of salt spray test chambers in chemical and environmental engineering, materials, structures and processes and other multi-disciplinary fields, scientifically and rationally expressing test results, better product selection, structural design, process selection, product transport storage And use to provide effective information to improve the salt spray corrosion resistance of the product or material.

Second, the role of salt spray test chamber in the actual

Salt spray test

   The salt spray test chamber is an environmental test that mainly uses the salt spray test chamber to create artificial simulated salt spray environmental conditions to evaluate the corrosion resistance of the product or metal material. It is divided into two categories, one is the natural environmental exposure test, and the other is One type is to artificially accelerate the simulated salt spray environment test. Artificially simulating the salt spray environment test is to use a test equipment with a certain volume space—salt spray test chamber, to artificially create a salt spray environment in its volumetric space. The salt spray corrosion resistance of the product is evaluated for its quality. Compared with the natural environment, the chlorine degree of the salt spray environment can be several times or dozens of times that of the normal natural environment. This will greatly increase the corrosion rate. The salt spray test is conducted on the product, and the time for obtaining the result is also greatly shortened. If a product sample is tested in a natural exposure environment, the corrosion may take one year, while the test under artificial simulated salt spray environment conditions takes only 24 hours. , you can get similar results.

   The salt spray test using a salt spray tester included neutral salt spray test, acetate spray test, copper salt accelerated acetate spray test, and alternating salt spray test.

1. Neutral salt spray test (NSS test) is one of the earliest currently used in the field of accelerated corrosion test method. It uses 5% saline solution, the solution PH value in the neutral range (6 ~ 7) as a spray The solution used. The test temperature is taken at 35 °C, the required salt spray sedimentation rate between 1 ~ 2ml/80cm2.h.

2. Acetate salt spray test (ASS test) was developed on the basis of the neutral salt spray test. It is to add some glacial acetic acid in 5% saline solution, so that the PH value of the solution is reduced to about 3. The solution changes. It becomes acidic, and the final salt fog is also changed from neutral salt fog to acidic. Its corrosion rate is about 3 times faster than the NSS test.

Salt spray test chamber

3. Copper Salt Accelerated Acetate Salt Spray Test (CASS Test) is a rapid salt spray corrosion test newly developed abroad. The test temperature is 50°C. A small amount of copper salt, copper chloride, is strongly induced in the salt solution. Corrosion. Its corrosion rate is about 8 times that of the NSS test.

4. Alternating salt spray test is an integrated salt spray test. It is actually a neutral salt spray test plus a constant damp heat test. It is mainly used for cavity-type whole product, through the penetration of the tide environment, so that salt Fog corrosion is not only produced on the surface of the product, but also generated inside the product. It is the product of alternating salt and hot and humid two environmental conditions, the final assessment of the overall product electrical properties and mechanical properties have no change.

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