Salt fog test box should meet what conditions should meet the salt spray test chamber is a simulation of marine weathering environmental weathering test equipment, is China's "three defenses" one of the salt spray corrosion. According to the relevant manufacturing standards of our country's test equipment, the salt spray corrosion test box equipment should be made of materials that are not affected by the salt spray test.
First, the salt spray chamber equipment should meet the following conditions:
1. The salt spray test conditions should be within the specified tolerance range.
2. The volume of the salt spray test chamber is large enough to be free from the influence of the suffocating flow and the test sample, with constant and uniform conditions.
3. During the test, salt spray shall not be directly injected on the test sample.
4. The liquid condensed on the top plate, side wall and other parts of the salt spray chamber equipment should not fall on the tested product.
5, salt spray test chamber equipment should be provided with appropriate ventilation holes, so that the inside and outside the air pressure balance, and evenly distributed salt spray. The exhaust end of the vents should be such as to avoid strong drafts and produce strong salt spray streams.
6. The sprayer should be made of materials that are not affected by the salt spray test, and can produce tiny, dispersed, moist, dense salt spray.
7. The sprayed salt solution should not be reused.
8, if you use compressed air, should not contain any oil and dust and other impurities.
Second, salt spray test chamber salt solution conditions:
1, 5% nacl solution; mass percentage concentration of 5% ± 1%.
2. The dry weight NaI content does not exceed 0.1%, and the impurity content does not exceed 0.3%.
3. The relevant specification may require the use of other salt solutions. The composition and pH of the solution shall be given.
4. The pH of the nacl solution should be maintained between 6.5 and 7.5 at 20°C ± 2K. The pH must be determined for each new batch of solution and recorded in the report.
5, when preparing nacl solution, you can use dilute hydrochloric acid or nacl to adjust the PH, but the concentration of nacl solution should still be within the required range.
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