The method of evaluating the corrosion of the salt spray test chamber is as follows:
1. Reference sample:
In order to verify the corrosion rate of the equipment, four samples of the following materials are used as reference samples: CR4 grade steel is used according to ISO3574, the surface has no holes or scratches, and is subjected to texturing (the average roughness of the centerline Ra = 0.8um ± 0.3um), high-purity zinc, the impurity mass percentage is less than 0.1%, the reference sample should be carefully cleaned before the test to remove all impurities (dust, oil or other impurities) that may affect the test result, and the reference is measured after drying The quality of the sample is accurate to ± 1mg. The reverse side of the test surface of the reference sample should be protected by a peelable water-resistant coating material (such as tape). If necessary, the test surface should also be protected from 5mm-10mm from the end. To cover the edges of the sample.
2. The position of the reference sample:
The four reference samples are placed in the four corners of the salt spray test box, with the unprotected surface facing upwards, and 20 ° C ± 5 ° C from the vertical. If the salt spray test box is not full of samples, it is recommended to place the empty part The size of the inert flat simulated sample to ensure the uniformity of the spray. The simulated sample material should be plastic, glass or other inert insulating material, which will not affect the corrosion rate of the tested sample. The reference sample holder should be made of inert material For example, plastics or similar materials coated on the surface, the lower part of the reference sample should be level with the top of the salt spray collector.
3. Test time
The test time should be 48H (6 cycles) for Method A and 96H (2 cycles) for Method B
4. Determination of quality loss
Immediately after the test, the reference sample should be taken out of the salt spray test chamber, the coating for protecting the sample should be removed, and then repeatedly cleaned according to the standard to remove corrosion products
5. Equipment operation detection
If the mass loss of each reference sample is within the specified range, the test equipment is considered to be operating well. Evaluation method for corrosion of salt spray test chamber
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