Neutral salt spray test

Neutral salt spray test is to spray salt water containing (5± 0.5)% sodium chloride with a pH value of 6.5 ~ 7.2 through a spray device in a specific test box, let the salt spray settle on the test part to be tested, and observe its surface corrosion state after a certain period of time. The temperature of the test chamber is required to be (35±2)℃, the humidity is greater than 95%, the fog reduction is 1 ~ 2mL/(h·cm2), and the nozzle pressure is 78.5 ~ 137.3kPa(0.8 ~ 1.4kgf/cm2).

Acetate spray test

The acetate spray test was developed on the basis of the neutral salt spray test. It is to add some glacial acetic acid to 5% sodium chloride solution, so that the PH value of the solution is reduced to about 3, the solution becomes acidic, and the salt spray finally formed is also changed from neutral salt spray to acidic. Its corrosion rate is about 3 times faster than the neutral salt spray test.

Copper acetate accelerated salt spray test

Copper salt accelerated acetate salt spray test is a rapid salt spray corrosion test developed in recent years. The test temperature is 50℃, and a small amount of copper salt - copper chloride is added to the salt solution to strongly induce corrosion. Its corrosion rate is about 8 times that of the neutral salt spray test.