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1. As the core index of the salt spray test chamber, the salt spray settling amount is 1 ~ 2ml / 80cm2 · h. If one set is 1.2ml / 80cm2 · h, the other set 1.2ml / 80cm2 · h , Although they are all within the standard settlement, the test results will definitely be different. In this case, you can directly compare the total salt water consumption during the test;
Second, the problem of collection of settlement: the brine consumption is normal, but the settlement is very small. When encountering such problems, we must first consider whether there is leakage of salt water, that is to say, the consumed salt water has not been completely sprayed out. Secondly, we must consider whether the nozzle is broken, whether the mist collecting funnel is inclined, and whether the hose between the mist collector and the funnel is blocked. If the sedimentation amount cannot be truly reflected, it will cause misunderstanding to the user that the spraying amount is too small.
3. Temperature setting: If there is a difference in the temperature setting of the salt spray test chamber, it will undoubtedly cause a difference in the test results;
Fourth, the concentration of salt water: the standard salt spray test concentration is 5% (salt, water mass ratio is 5:95), if the concentration of salt water is too large, it will increase the degree of corrosion of the sample;
Fifth, the pH of the brine: After the standard brine is configured, its PH value should be neutral (PH value between 6.5 and 7.2). However, the purity of some salts does not meet the requirements, or is affected by the quality of the water, and the PH value of the brine is often not within the required range. Therefore, after the brine is required, the pH needs to be tested by PH test paper. If it is higher than this standard, add a few drops of Hcl to neutralize; if it is lower than this standard, add some NaoH to neutralize. Until the PH value is neutral. It is important to know that once non-neutral brine is used for the test, the degree of corrosion of the sample increases exponentially. (For example: when the PH value is equal to 3.5, the corrosion degree is 7 to 8 times that when the PH value is equal to 7.0).
If the above problems have not been solved, please call the technical department of Beijing Yashilin Salt Spray Test Chamber Factory for the reasons and solutions that affect the test results of the salt spray test chamber
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