All equipment needed in the test: Spray nozzle, salt water barrel, test piece support, spray liquid collection container, test chamber, salt water, supply tank, pressure tank, supply equipment and exhaust equipment required for compressed air, the device is shown in Fig, and test as followed. 1.Blunt material is required, it is required that the material itself cannot be corroded, and it can not affect the corrosion test. 2.The fog nozzle cannot spray the test liquid directly to the sample , the solution at the top of the spraying chamber cannot drop on the test piece. 3.The test liquid dropped from test piece cannot flow back to the salt bucket again for the test. 4.The solution should not contain grease and dust, so you have to prepare an air cleaner. 5.Spray liquid should be collected at least 16 hours, an average per hour can be collected 2ml to 1ml solution. Use the final average to represent the amount of spray. 6.The concentration of the Sodium Chloride Solution should be maintained at 40~60g/L. 7.The temperature of the pressure barrel should be kept in 47+1 degree,temperature of the brine barrel should be kept in 35+1 degree. Sample placement: 1.If you need to test many pieces, make sure that every major surface can be detected by salt fog at the same time. 2.Permutation of samples, the spray should be free to drop on all the test pieces, preventing the situation of blocking the spray. 3.Each sample cannot be in contact with each other. 4.Salt spray can’t drop from one test piece to another one. 5.Sample identification mark should be marked on the bottom of the test piece. Items include: 2 bottles of (NO include)， Nozzel*1， Hydrometer*1， 1 pack of PH test pape, Instuction*1， Measuring cup*1，
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