Enter the “Salt Fog Test Box†in Baidu, you will find more than one hundred or even thousands of information about the salt spray test chamber. It can be seen that the salt spray test chamber is closely related to our life. Today, I will explain to you here. I don't know the salt spray test box knowledge.
In the salt spray test, the main factors affecting the salt spray test results include: test temperature and humidity, sample placement angle, pH value of salt solution, concentration of salt solution, salt spray settlement and spray method.
1. Test temperature and humidity: Temperature and relative humidity affect the corrosion of salt spray. The critical relative humidity of metal corrosion is approximately 70%. When the relative humidity reaches or exceeds this critical humidity, the salt will deliquesce to form an electrolyte with good electrical conductivity. When the relative humidity is lowered, the concentration of the salt solution will increase until the crystalline salt is precipitated, and the corrosion rate is correspondingly lowered. The higher the test temperature, the faster the salt spray corrosion rate.
2. Placement angle of the sample: The placement angle of the sample has a significant effect on the results of the salt spray test. The sedimentation direction of the salt spray is close to the vertical direction. When the sample is placed horizontally, its projected area is the largest, and the sample surface receives the most salt spray, so the corrosion is the most serious. The GB/T2423.17-93 standard stipulates that “the method of placing the flat sample should be such that the test surface is at an angle of 30 degrees to the vertical direction.â€
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