In the previous section, the factors affecting the test results of the salt spray test chamber were the test temperature and humidity, the sample placement location, the salt water ratio (the pH value of the salt solution), in addition to the salt spray sedimentation amount and spray method , The concentration of the salt solution,

The finer the salt spray particles in the salt spray test chamber, the larger the surface area formed, the more oxygen is adsorbed, and the stronger the corrosion. In nature, more than 90% of the salt spray particles have a diameter of less than 1 micrometer. The research results show that the amount of oxygen adsorbed on the surface of the salt spray particles with a diameter of 1 micrometer and the amount of dissolved oxygen in the particles are relatively balanced. No matter how small the salt spray particles are, the amount of oxygen absorbed no longer increases.

The effect of the concentration of the salt solution on the corrosion rate in the salt spray test chamber is related to the type of material and coating. When the concentration is below 5%, the corrosion rate of steel, nickel and brass increases with the increase of concentration; when the concentration is greater than 5%, the corrosion rate of these metals decreases with the increase of concentration. This phenomenon can be explained by the oxygen content in the salt solution. The oxygen content in the salt solution is related to the salt concentration. In the low concentration range, the oxygen content increases with the increase of the salt concentration, but when the salt concentration increases to At 5%, the oxygen content reaches relative saturation. If the salt concentration continues to increase, the oxygen content decreases accordingly. When the oxygen content decreases, the depolarization ability of oxygen also decreases, that is, the corrosion effect is weakened. But for zinc, cadmium, copper and other metals, the corrosion rate of the salt spray test chamber always increases with the increase of the salt solution concentration.

What are the reasons why the test results of the salt spray test box are not allowed (2)

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