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Salt Spray Test

Salt spray corrosion is a common and highly destructive atmospheric corrosion.

The Salt Spray Test is an environmental test that uses artificial salt spray environments created by salt spray test equipment to evaluate the corrosion resistance of products or metal materials.

Salt Spray Test Classification

The Salt Spray Test is divided into two major categories: 1. Natural environment exposure test, 2. Artificially accelerated simulation salt spray environment test.

Artificial simulation of salt spray environment test is a testing equipment with a certain volume space called 'salt spray test box', which uses manual methods to create a salt spray environment in its volume space to assess the quality of the product's salt spray corrosion resistance performance. Compared with the natural environment, the chloride salt concentration in its salt spray environment can be several times or tens of times higher than the salt spray content in general natural environments, greatly increasing the corrosion rate. The time required to obtain the results of salt spray testing on products is also greatly shortened.

Artificially Simulated Salt Spray Test Classification

(1) Neutral Salt Spray Test (NSS Test)

It is the earliest and currently most widely used accelerated corrosion testing method. It uses 5% sodium chloride saline solution, and the solution PH value is adjusted in the neutral range (6-7) as the solution for spray. The experimental temperature is set at 35 ℃, and the settling rate of salt spray is required to be between 1-2ml/80cm ². h.

(2) Acetic Acid Salt Spray Test (ASS Test)

It is developed based on the neutral salt spray test. It is added with some glacial acetic acid in the 5% chloride sodium solution, making the solution PH value drop to around 3, and the solution becomes acidic. The final salt spray also changes from neutral to acidic. Its corrosion speed is about 3 times faster than the NSS test.

(3) Copper Salt Accelerated Acetic Acid Salt Spray Test (CASS Test)

It is a new and rapid salt spray corrosion test developed abroad. The test temperature is 50℃, and a small amount of copper salt—copper chloride is added to the salt solution, strongly inducing corrosion. Its corrosion speed is about 8 times faster than the NSS test.

(4) Alternating Salt Spray Test

It is a comprehensive salt spray test, which is actually a neutral salt spray test plus a constant humidity and heat test. It is mainly used for cavity type whole machine products, and through the infiltration of humid environment, salt spray corrosion not only occurs on the surface of the product, but also inside the product. It alternates the product between two environmental conditions of salt spray and humid heat, and finally assesses whether the electrical and mechanical properties of the entire product have changed.