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Impact of salt spray chamber test results - 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 in the salt spray test chamber 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.
The International Electrotechnical Commission IEC60355:1971 "AN APPRAISAL OF THE PROBLEMS OF ACCELERATED TESTING FOR ATMOSPHERIC CORROSION" standard states: "For every 10 °C increase in temperature, the corrosion rate is increased by 2 to 3 times, and the conductivity of the electrolyte is increased by 10 to 20%."
This is because of the increase in temperature, the increase in molecular motion, and the accelerated rate of chemical reactions. For the neutral salt spray test, most scholars believe that the test temperature is more appropriate at 35 °C. If the test temperature is too high, the salt spray corrosion mechanism is quite different from the actual situation.
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