4 types of salt spray tests that can be carried out in the salt spray corrosion test chamber

The salt spray corrosion test chamber uses salt-containing solutions or salt-containing acid solutions to accelerate the corrosion of materials or products under a certain temperature and relative humidity environment, and reproduce the corrosion of materials or products experienced within a certain time range. . level of destruction. The equipment can be used to evaluate the salt spray corrosion resistance of materials and their protective layers, as well as to compare the process quality of similar protective layers. It can also be used to evaluate the salt spray corrosion resistance of certain products.
The salt spray corrosion test chamber can conduct four types of tests: neutral salt spray test, acetate salt spray test, rapid copper salt acetate salt spray test and alternating salt spray test.

Neutral salt spray test:
When the test tube is placed in the box, do not directly touch the box, but should be hung or placed on the shelf, if it is in sheTo form, it must form an angle of 15° to 30° with the plane. Spray tests are carried out intermittently or continuously. Typically, a 24-hour period is used as the observation period. The intermittent type sprays for 8 hours and stops for 16 hours. The continuous type sprays continuously. Different observation times can also be agreed upon as required. Customers can customize test duration based on product usage and transportation location/environment.

Salt spray test on acetate:
Salt spray corrosion test chamber The laboratory that can perform the salt spray test on the The acetate has a reliability of approx.Iron and Electromagnetic Compatibility Testing Service Center, Third Aerospace Academy, etc. The acetate salt spray test (ASS test) was developed based on the neutral salt spray test. He adds a little glacial acetic acid to a 5% sodium chloride solution to reduce the pH value of the solution to about 3, making the solution acidic and the result.g salt spray also passes salt spray neutral to acid. Its corrosion rate is approximately 3 times faster than the NSS test.

Copper Salt Acetate Accelerated Salt Spray Test:
The salt spray test chamber can perform salt spray test Copper Salt Accelerated Acetate Saline (CASS Test) is a rapid salt spray corrosion test recently developed abroad. The test temperature is 50°C. A small amount of copper salt-copper chloride is added to the sa solutionline to strongly induce corrosion. Its corrosion rate is about 8 times that of the NSS test. Currently, laboratories that can conduct neutral salt spray testing include the Environmental Reliability and Electromagnetic Compatibility Testing Service Center, the Third Aerospace Academy, etc.

Alternating salt spray test:
The alternating salt spray test is a complete salt spray test, which is actually a fog test neutral saline plus a constant moist heat test. It is mainly used for cavity type complete machine products. Through the penetration of the humid environment, salt spray corrosion occurs not only on the surface of the product, but also inside the product. It alternately transforms the product in two environmental conditions: salt spray and humid heat, and finally evaluates whether there ischanges in the electrical and mechanical properties of the complete product.

In addition, the electrical control system of the salt spray corrosion test chamber is mainly composed of power supply safety control, temperature and an ultra-high temperature protection device, a heating circuit and an electromagnetic gas path. control circuit. ElectricityIn addition to over-voltage and over-current protection, the circuit is also designed with an ultra-high temperature protection device. That is, when the temperature of the test chamber exceeds the set value, the device will cut off the power supply in time to protect the safety of the test chamber. The temperature is controlled by a temperature controller to control the heating device of the test chamber and the saturator. Temperature changesWorking hours are randomly and continuously sampled by two temperature sensors and displayed on the instrument. The temperature controller will show the actual temperature and the set temperature value. After comparison, a heating or heating stop command is issued for temperature control. When the temperature reaches the set value, it enters the constant temperature state. The saturator setting temperature is generally 1 to 5°C slightly higher than the laboratory setting temperature.

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