Principles for placing test pieces in salt spray test chamber
The salt spray test chamber uses a certain concentration of salt solution or acidic salt solution to conduct accelerated salt spray corrosion tests at a certain temperature and under a certain relative humidity environment through the method of salt spray. The salt spray test chamber is mainly used to evaluate the resistance of the sample materials and their protective coatings such as coatings and electroplated layers to the corrosion of salt spray, as well as the comparison of the process quality between similar and identical protective layers. The working temperature of the salt spray test chamber is between room temperature and 55 ° C and can be kept constant. The salt spray corrosion test is performed on the material or product under the condition that the relative humidity and temperature are constant in the chamber of the salt spray test chamber with the specified studio volume (generally 150L, ​​250L, 750L, 1000L, 2000L, etc.). So, when the salt spray test box is tested, how to place the test samples in the salt spray test box? The scientific placement method is: 1. The test sample is placed in the salt spray test chamber and the test surface is facing upwards, so that the salt spray generated during the spray of the salt spray test chamber can freely settle and deposit on the test surface of the sample. The salt spray cannot be directly sprayed on the test surface of the sample on. 2. The test sample should be flat in general. In the salt spray test chamber, the test surface of the sample should be 15 ° ~ 30 ° to the vertical direction, and as far as possible 20 °. For irregular samples (such as the entire workpiece), it should also be as close to the above requirements as possible. 3. The test samples can be placed on different horizontal surfaces in the salt spray test box, but they must not touch the box or contact each other. The distance between the test samples shall not affect the free fall of the salt spray on the test surface, and the salt spray droplets collected on the test sample shall not drip onto other test samples. For a new salt spray test with a total test period of more than 96 hours, the sample can be shifted. 4. The sample holder is made of glass, plastic and other materials resistant to salt spray and acid and alkali corrosion. If the sample needs to be hung on the holder, then the material of the suspended sample cannot be made of metal. Generally, cotton fiber and artificial fiber are used Or other non-metallic materials such as insulating materials. The test brackets are generally 8-10, and the "V" shaped sample brackets are corresponding 8-10. Of course, according to the number, size, test period and other conditions of the customer's test sample, it can be appropriately increased or decreased. Be explained.
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