Salt spray corrosion test results How to look at the neutral salt spray test and the salt spray test temperature of the salt spray chamber is 35 °C ± 2 °C. The temperature of the salt spray chamber for the copper accelerating acetate spray test is 50°C ± 2°C. During the test, the temperature fluctuations in the entire salt spray box should be as small as possible. After the salt mist container has been placed as planned in the salt spray box, and the rate and conditions of salt spray collection are within the specified range, the test is started.
First, the speed of salt spray deposition (salt spray deposition rate), after 24h spray, each 80cm2 area is l ~ 2ml / h; nacl concentration of 50g / L ± 5g / L; pH range is: Neutral salt The fog test was 6.5 to 7.2, the acetate spray test was 3.1 to 3.3, and the copper accelerated acetate spray test was 3.1 to 3.3.
Second, salt spray corrosion test spray solution can not be reused.
Third, the temperature and pressure during the test should be stable within the specified range.
Fourth, salt spray corrosion test cycle
1, the test cycle should be based on the test material or product selection criteria. If there is no standard, the customer can decide according to the product's own conditions. The recommended test period for Wuhan Shangchen Test Equipment Co., Ltd. is 2h, 4h, 6h, 8h, 24h, 48h, 72h, 96h, 144h, 168h, 240h, 480h, 720h. , 1000h;
2. The spraying shall not be interrupted during the specified test period. Only when the sample is required to be observed for a short time can the salt spray box be opened.
3. If the end point of the test depends on the time at which corrosion has started, the sample should be checked frequently. Therefore, these specimens cannot be tested together with specimens that require a predetermined test period;
4. Specimens of a predetermined test cycle may be visually inspected on a regular basis, but during the inspection process, the surface of the test cannot be destroyed. The time and frequency of opening the salt spray tester should be as few as possible.
Fifth, the salt spray test after the test
After the end of the test, the sample is taken out. In order to reduce the loss of corrosion products, the sample is naturally dried in the room for 0.5 to 1 hour before cleaning, and then gently cleaned with clean flowing water at a temperature of not higher than 40° C. to remove the remaining surface of the sample. Salt spray solution, immediately blow dry with a hair dryer.
Sixth, evaluation of salt spray corrosion test results
The evaluation criteria of the test results should usually be put forward by the test material or product standards. The general test only needs to consider the following aspects:
1, the appearance after the test;
2, remove the appearance of surface corrosion products;
3, corrosion defects such as pitting, cracks, bubbles and other distribution and number, according to GB 6461, GB12335, GB/T 9798-1997 Appendix C (ISO1462: 1973) specified by the method of assessment;
4, the beginning of corrosion time;
5, weight changes;
6, microscope observation;
7, changes in mechanical properties.
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