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The role and main types of salt spray test chambers
Category: Industry News
With the increasing application of salt spray test chambers, their advantages are widely known. Currently, they are widely used in aerospace, aviation, petroleum, chemical, electronics, and communications industries. Let's learn about the functions and main types of salt spray tests!
Salt spray test chambers mainly simulate the salt spray environment in the atmosphere to evaluate whether the performance of samples is affected in the salt spray environment. Users configure test solutions with corresponding concentrations according to certain test conditions. The bottom of the chamber is equipped with heating tubes. Through the control system, a certain salt spray humidification environment is formed inside the chamber. The external connected gas source is humidified and heated through a saturator. Through the air tube and spray tower, it sprays the test samples, causing salt spray corrosion.
The main function is to artificially simulate the main marine climate to evaluate the salt spray corrosion resistance of materials, products, and their protective layers, and to evaluate the technical quality of the protective layers.
It can be said that using salt solutions or acidic salt solutions, under certain temperature and relative humidity conditions, accelerates the corrosion of materials or products, reproducing the degree of damage suffered by materials or products within a certain period. The equipment can be used to evaluate the salt spray corrosion resistance of materials and their protective layers and compare the technical quality of similar protective layers. It can also be used to evaluate the salt spray corrosion resistance of certain products.
Salt spray test chambers are mainly divided into several experiments:
1. Neutral salt spray test: The test piece cannot directly contact the chamber body of the salt spray test chamber; it must be placed or hung on a rack. When the object is plate-shaped, it needs to have an angle of 15~30 degrees relative to the plane. There are two types of spraying methods: continuous and intermittent. Continuous spraying, as the name suggests, is to continuously spray and observe according to the specified time.
2. Acetic acid salt spray test: The corrosion rate of the acetic acid salt spray test is about 3 times faster than that of the neutral salt spray test. In this test chamber, after adding some acetic acid to a 5% concentration salt solution (sodium chloride), the pH of the solution is reduced to about 3 to make it acidic, and then the neutral salt spray is made acidic.
3. Copper salt accelerated acetic acid salt spray test: This is a rapid salt spray corrosion test developed abroad. The test temperature is 50℃, and the corrosion rate of this test is about 8 times that of the neutral salt spray test. This is because a small amount of copper salt, copper chloride, is added to the salt solution of this test, which can quickly induce corrosion.
4. The steady-state humid heat test of the laboratory plus the neutral salt spray test, a comprehensive salt spray test with penetration in a humid environment—alternating salt spray test. The salt spray corrosion in this test chamber exists not only on the surface of the test piece but also inside it.
Advantages of salt spray test chamber: controllable corrosion environment, good environmental reproducibility.
The above is an introduction to the functions and main types of salt spray tests. If you need to learn more, please feel free to contact us!
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