The large-scale salt spray corrosion test chamber is used to simulate the corrosion process of materials and products in a salt spray environment, in order to evaluate their corrosion resistance and service life. Salt spray corrosion testing is widely used in fields such as metal materials, coatings, and electronic devices, especially in industries such as automotive, aerospace, and electronic equipment, where it plays an important role.
The standards for salt spray corrosion testing are mainly determined by the testing methods and environmental conditions, and are commonly used international and domestic standards. The following are several main salt spray corrosion test standards:
1、 International standards
Salt spray test method
This standard specifies the basic requirements and methods for salt spray testing, used to evaluate the corrosion resistance of materials, coatings, and anti-corrosion products in salt spray environments. Its main contents include:
Test conditions: The environmental conditions, salt solution concentration, temperature, and test period of the laboratory are specified.
Salt spray solution preparation: It is recommended to use sodium chloride (NaCl) solution, with a concentration of usually 5 ± 1% (mass percentage).
Test equipment: It is required to use a salt spray corrosion test chamber that meets the standards to ensure stable conditions such as temperature and humidity inside the chamber.
Environmental testing of electronic equipment for electric vehicles (salt spray test)
For the salt spray corrosion test of electronic devices in electric vehicles, the standard specifies the testing of electronic devices at different salt spray concentrations, temperatures, and test times to evaluate their resistance to salt spray corrosion.
2、 American Standard
ASTMB117 Salt Spray Corrosion Test
ASTMB117 is one of the commonly used salt spray corrosion testing standards, widely used for corrosion resistance testing of metal materials, coatings, and anti-corrosion products. The key contents include:
Test conditions: Use sodium chloride (NaCl) solution with a concentration of 5 ± 1% (mass percentage) and a test temperature of 35 ° C ± 2 ° C.
Salt spray type: Testing includes neutral salt spray test (NSS) and acidic salt spray test (AASS), suitable for testing different materials and anti-corrosion coatings.
Test cycle: Generally, according to the requirements of the sample, the test time can range from a few hours to several thousand hours, depending on customer or standard requirements.
ASTMG85- Salt Spray Corrosion Test (Accelerated Acid Salt Spray Test)
ASTMG85 is an accelerated salt spray corrosion test standard suitable for evaluating the corrosion resistance of coatings, metals, and electronic devices in harsh environments. It is usually used for corrosion testing of products under extreme conditions.
3、 Domestic standards (Chinese standards)
salt spray test
This standard is the basic requirement for salt spray corrosion testing in China, mainly used for testing the salt spray corrosion resistance of electrical and electronic products and their components. The key contents include:
Test solution: Sodium chloride (NaCl) solution with a concentration of 5 ± 1% (mass percentage) in salt spray solution.
Test conditions: The temperature of the salt spray corrosion test chamber is usually set at 35 ° C ± 2 ° C, and the duration of the test depends on the sample requirements.
Test method: spray the salt spray solution on the sample through the spray device in the test chamber, observe its corrosion and record it.
Metal and alloy salt spray corrosion test
This standard is applicable to salt spray corrosion testing of metals, alloys, and their coatings, including detailed regulations on temperature, humidity, salt solution concentration, and test period. It is widely used in industrial production, especially in corrosion resistance testing of automobiles, machinery manufacturing, and electronic products.
Coating salt spray corrosion test method
A standard specifically designed to evaluate the salt spray corrosion performance of coatings, applicable to the corrosion resistance testing of various metal surface coatings (such as spray coating, hot-dip coating, etc.).
4、 Main technical parameters of salt spray test chamber
According to the above standards, the main technical parameters of the salt spray corrosion test chamber usually include:
Temperature control range: generally required between 35 ° C ± 2 ° C, adjustable according to experimental requirements.
Salt solution concentration: The concentration of sodium chloride solution is generally 5 ± 1% (mass percentage), and some standards allow the use of salt solutions of different concentrations for testing.
Spray volume and spray intensity: the salt spray solution is sprayed to the sample surface through the spray device in the test chamber, and the spray intensity usually needs to be controlled within a certain range.
Test cycle: Depending on the corrosion resistance requirements of different materials, the test cycle usually ranges from several hundred hours to several thousand hours.
Sample placement: The placement of the sample in the test chamber should ensure that the salt spray is evenly covered and not affected by external factors.
5、 Evaluation of Salt Spray Corrosion Test
After the experiment is completed, the samples are usually evaluated using the following methods:
Visual inspection: Observe whether there are signs of corrosion, spots, discoloration, etc. on the surface of the sample.
Weight loss method: Evaluate the degree of corrosion of the sample by weighing the difference in weight before and after the test.
Electrochemical testing: using electrochemical methods to measure the corrosion rate and electrochemical behavior of materials.
SEM (Scanning Electron Microscopy) observation: By observing corrosion products and corrosion mechanisms through an electron microscope, analyze the corrosion mode of materials.
summary
The salt spray corrosion test standard plays a very important role in testing the corrosion resistance of materials and products. By following standards, the accuracy and consistency of experiments can be ensured, thereby helping companies ensure the durability and safety of their products in product design, production, and quality control.