Application of salt spray test chamber in real life

Salt spray test chamber is a kind of environmental test which mainly uses the artificial simulated salt spray environment conditions created by salt spray test equipment to assess the corrosion resistance of products or metal materials It can be divided into two categories, one is natural environmental exposure test, the other is artificial accelerated simulated salt spray environmental test Artificial simulated salt spray environment test is to use a kind of test equipment with a certain volume space, salt spray test chamber, in its volume space with artificial methods, resulting in salt spray environment to assess the salt spray corrosion resistance quality of products Compared with the natural environment, the salt concentration of chloride in the salt spray environment can be several times or dozens of times of that in the general natural environment, which greatly improves the corrosion rate and shortens the time to get the result of salt spray test on the product If a product sample is tested in natural exposure environment, it may take one year to corrode it However, if it is tested in artificial simulated salt spray environment, it only takes 24 hours to get similar results The artificial simulated salt spray test includes 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 a kind of accelerated corrosion test method which has been widely used in Zui for a long time It uses 5% NaCl solution, and the pH of the solution is in neutral range (6~7) as a spray solution The test temperature is 35 ℃, and the sedimentation rate of salt spray is required to be between 1-2ml / 80cm2 H 2 The acetate spray test (ASS test) is developed on the basis of the neutral salt spray test It is to add some glacial acetic acid into 5% sodium chloride solution to reduce the pH value of the solution to about 3, the solution becomes acid, and the salt mist formed after Zui also changes from neutral salt mist to acid Its corrosion rate is about three times faster than NSS test 3 Cass (copper salt accelerated acetate spray test) is a kind of rapid salt spray corrosion test recently developed abroad The test temperature is 50 ℃, and a small amount of copper salt copper chloride is added into the salt solution, which strongly induces corrosion Its corrosion rate is about 8 times that of NSS test 4 Alternating salt spray test is a comprehensive salt spray test, which is actually a neutral salt spray test plus a constant heat and humidity test It is mainly used for the whole machine products of cavity type Through the infiltration of damp environment, salt spray corrosion occurs not only on the product surface, but also inside the product It is to change the product alternately in salt fog and hot and humid environment After Zui, check whether the electrical and mechanical properties of the whole product have changed.