The salt spray test, also known as the salt fog test, is a popular corrosion testing method. The accelerated standardized test measures the corrosion resistance of metallic products exposed to salt spray or fog. In the salt spray test, samples are placed in an enclosed salt spray testing cabinet or chamber and subjected to uninterrupted indirect fog or spray of a salt water solution. This environment is maintained throughout the duration of the test. Chamber construction, testing procedure and testing parameters are standardized under national and international standards, like ASTM B117 and ISO 9227. There are three variations to this test and they include neutral salt spray (NSS), acetic acid salt spray (AASS), and copper-accelerated acetic acid salt spray (CASS). At Alfa Chemistry, we offer salt spray tests to test the salt or mist resistance of electroplated parts.
Neutral salt spray (NSS) uses 5% sodium chloride solution with a pH range of 6.5-7.2 while being atomized under a controlled environment.
Acetic acid salt spray (AASS) uses the same 5% salt solution with the exception of glacial acetic acid to lower the pH range to about 3.1-3.3.
The copper accelerated acetic acid salt spray (CASS) is similar to the AASS method by using glacial acetic acid to obtain a pH range from 3.1-3.3 but copper chloride is another additive in the solution.
The advantages of the salt spray test
The salt spray test has many advantages over other corrosion testing methods. The following shows the main advantages of this test.
- The test is relatively inexpensive.
- The test duration is rather short compared to the natural environment.
- The test is suitable for multi-material.
- The test applies to both the shaped parts or equipped items.
The applications of the salt spray test
The salt spray test has a wide range of promising applications in the field of electroplating. The following shows the main applications of this test.
With a solid theoretical foundation, Alfa Chemistry has the ability to provide salt spray testing services to test the salt or mist resistance of electroplated parts. Our salt spray testing service strictly follows STM B117 and ISO 9227 reference standards.
ASTMB117, also known as Standard Practice for Operational Salt Spray (Fog), is used to analyze the relative corrosion of plated samples exposed to various simulated climatic conditions in a controlled environment.
ISO 9227 is a corrosion test in artificial atmospheres. It is used as a technique to assess a plated sample’s resistance to corrosion. By producing an attack to plated specimens, it is possible to determine if the protecting plating is suitable.
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For many years, Alfa Chemistry has been providing customers with engineered solutions in metal finishing. Regardless of the industry, surface treatment or application, the principle issues surrounding the art and science of metal finishing remain the same. You can trust Alfa Chemistry for:
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