Manually simulating high and low temperature boxes is a widely used method at present. The artificial simulated high and low temperature test chamber includes four different types: neutral high and low temperature test chamber, acetic acid high and low temperature test chamber, copper salt accelerated acetic acid high and low temperature test chamber, and alternating high and low temperature test chamber. The neutral high and low temperature test chamber (NSS test) is the earliest and most widely used accelerated corrosion test method. The high and low temperature test chamber is an environmental test method that uses salt spray environmental conditions to assess the corrosion resistance of products or metal materials. It uses 5% sodium chloride salt water solution, and the PH value of the solution is adjusted to a neutral range (6-7) as a spray solution. The test temperature is 35 â„ƒ, and the sedimentation rate of salt spray is required to be between 1 and 2ml / 80cm2.h. Acetic acid high and low temperature test chamber (ASS test) is developed on the basis of neutral high and low temperature test chamber. It is to add some glacial acetic acid to the 5% sodium chloride solution to reduce the PH value of the solution to about 3, the solution becomes acidic, and the salt mist formed at the end of the high and low temperature chamber also changes from neutral salt mist to acidic. Its corrosion rate is about 3 times faster than the NSS test.
The copper salt accelerated acetic acid high and low temperature test chamber (CASS test) is a rapid salt spray corrosion test recently developed abroad. The test temperature is 50 Â° C. A small amount of copper salt-copper chloride is added to the salt solution to strongly induce corrosion. Its corrosion rate is about 8 times that of the NSS test. High and low temperature test chambers are generally divided into two categories: one is the natural environment exposure test, and the other is the artificial acceleration simulated salt spray environment test. The alternating high and low temperature test box is a comprehensive high and low temperature test box, which is actually a neutral high and low temperature test box plus a constant damp heat test. It is mainly used for hollow machine products. Through the penetration of the tidal environment, the salt spray corrosion not only occurs on the surface of the product, but also occurs inside the product. It converts the product alternately under the two environmental conditions of salt spray and humid heat, and finally assesses whether the electrical and mechanical properties of the whole product have changed.
What is the high and low temperature test box, what is its principle, and what are the advantages in use? The high and low temperature test box is a kind of test equipment used to artificially simulate the salt spray environment test. The working principle of the high and low temperature test box is: in the volume space of the high and low temperature test box, artificial methods are used to create a salt spray environment to assess the quality of the salt spray corrosion resistance of the product. Compared with the natural environment, the salt concentration of the chloride in the salt spray environment can be several times or tens of times that of the general natural environment. The high and low temperature box greatly improves the corrosion rate. , The time to get results is also greatly reduced. For example, in a naturally exposed environment, a sample of a product is tested, and its corrosion may take 1 year, and a test under artificially simulated salt spray environment conditions, as long as 24 hours, you can get similar results, saving a lot of time .
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