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Working principle and test steps of salt spray test chamber
Category: Industry News
The salt spray test chamber, also known as a salt spray test machine or saline spray test machine, is used to test corrosion resistance by simulating extreme natural and operating conditions. It primarily measures the corrosion resistance of samples. Currently, it's widely used in aerospace, automotive electronics, electrical and electronic engineering, mobile digital devices, plastics, and metal materials industries. Let's explore the working principle and test steps of a salt spray test chamber!
Existing salt spray test chambers have evolved from simple neutral salt spray tests to include acetic acid salt spray tests, copper-accelerated acetic acid salt spray tests, and cyclic salt spray tests. China also has detailed national standards for salt spray testing.
I. Working Principle of the Salt Spray Test Chamber:
The working principle of a salt spray test chamber is relatively simple. This test can be conducted continuously or cyclically until corrosion appears on the sample. It mainly involves compressing a corrosive solution into an air spray to spray the sample, ensuring the spray covers all sides of the sample for a specific corrosion time.
The corrosive solution in the salt spray test chamber is primarily a 5% concentration of sodium chloride solution. Additionally, the salt spray test chamber can independently control the salt spray deposition and spraying amount. Alternatively, 0.26 grams of copper chloride per liter can be added to the sodium chloride solution to create a salt spray corrosive solution. Therefore, it is frequently used to test the corrosion resistance of everyday and industrial products. The test temperature is constant, the operation is convenient, and the test environment is stable.
The chamber maintains a constant temperature within the testing space, ranging from ambient temperature to 50°C. It does not react with saline or acidic saline solutions, ensuring the test results are not affected. The equipment is designed with internal and external pressure balance, allowing the salt spray to settle freely within the chamber. Under constant temperature and relative humidity within the chamber, salt spray corrosion tests are performed on materials or products. The equipment is manufactured using imported corrosion-resistant PVC plastic sheets.
II. Salt Spray Test Chamber
1. Prepare a 1.5% saline test solution. Using a measuring cup, take 13.3 liters of pure distilled water and add 700g of industrial sodium chloride (NaCl), stirring until evenly mixed.
2. Divide the prepared saline test solution into cups and place them into the solution inlet. Pour the saline test solution into the saline preheating tank.
3. Place the test samples on the racks. Before the test, the surface of the test samples should be clean, free of oil, and without any temporary protective layer.
4. Turn on the power switch of the salt spray test machine, and then turn on the immediate spray switch and the timer spray switch. The spraying begins, initiating the salt spray test. After 12 hours, set the test chamber temperature to 35°C, the pressure tank temperature to 45°C, and the test time to 12 hours. Proceed according to the contract.
5. After the test, gently rinse the salt deposits from the surface of the test samples with running water, then rinse in distilled water. The rinse water temperature should not exceed 35°C. The salt spray test machine will automatically shut down after the salt spray test is complete. For clients with specific time requirements in the contract, pass/fail criteria are determined by the absence or presence of corrosion, blistering, cracking, or rust. Samples are allowed to recover for 2 hours under indoor atmospheric conditions before further testing. The recovered metal test samples undergo a salt spray test.
6. Fill out the salt spray test report based on the test results. If the results are unsatisfactory, the IQC (Incoming Quality Control) person in charge will contact the supplier to analyze the causes and determine whether the product is acceptable or not. The report will then be submitted for upper-level review and approval. Corrective actions will be confirmed.
7. Please replace the saline test solution and the water in the heating tank every month, and clean the salt spray test chamber.
The above is an introduction to the working principle and test steps of the salt spray test chamber. For more information, please feel free to contact us!
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