Salt Test Standard for Salt Test

A salt spray test chamber is used to assess the corrosion resistance of the tested samples by subjecting them to salt spray corrosion. Salt spray refers to a dispersed system of tiny salt-containing droplets in the atmosphere, commonly found in the marine environment. Many companies require their products to withstand the destructive effects of marine climatic conditions, leading to the use of salt spray test chambers.

The working principle of a salt spray test chamber is relatively simple. It involves compressing a corrosive solution into an air spray and spraying it onto the samples, ensuring full coverage of all surfaces. This test can be carried out continuously or cyclically until corrosion appears on the samples. The time taken for corrosion to occur is recorded as the sample’s corrosion resistance. The longer the time, the better the corrosion resistance.

The corrosive solution typically used in salt spray test chambers is a 5% concentration of sodium chloride solution or a sodium chloride solution with 0.26 grams of cupric chloride added per liter. Additionally, salt spray test chambers can autonomously control the amount of salt spray and ensure a constant test temperature, convenient operation, and a stable test environment. Consequently, they are commonly used to assess the corrosion resistance of everyday or industrial products.

Salt test is a widely used method to test the corrosion performance of metal materials, coatings, or plating layers. By simulating the special weather conditions of the marine environment, it evaluates the materials’ corrosion resistance in humid environments. However, conducting salt spray testing requires adherence to specific criteria and operating procedures.

The judgment criteria for salt spray testing assess the corrosion resistance of materials based on the degree of corrosion. Some commonly used criteria include:
1. ASTM B117 standard: This is the most commonly used salt spray test standard, suitable for evaluating the corrosion resistance of coatings, paints, and materials. The degree of corrosion is classified into seven levels, ranging from 0 to 10, with increasing degrees of corrosion.
2. ISO 9227 standard: This is a salt spray test standard established by the International Organization for Standardization. It also classifies the degree of corrosion into different levels, similar to ASTM B117.
3. GB/T 10125 standard: This is a salt spray test standard developed by the Chinese National Standardization Organization. It is applicable for testing the corrosion performance of metal materials and coatings, categorizing materials into five levels based on the degree of corrosion.
In addition to these standards, there are industry-specific standards and company-specific standards that can be used for customized testing based on specific requirements.

During salt test, it is essential to follow specific operating procedures to ensure accurate and comparable results. The general operating procedures are as follows:
1. Sample preparation: Prepare the samples according to the requirements, including cleaning and removing oxide layers. For coatings or plating layers, additional preparations, such as cutting or treating the surfaces, may be necessary.
2. Saltwater solution preparation: Prepare the saltwater solution as per the standard requirements. Typically, a 5% concentration of saltwater solution is used. It is important to use high-quality table salt that meets the requirements.
3. Salt spray test chamber setup and calibration: Set up and calibrate the salt spray test chamber according to the equipment instructions. This involves adjusting parameters such as saltwater spray amount, atomizer pressure, temperature, and humidity.
4. Sample fixture and labeling: Fix the samples onto the test rack and label them for identification and tracking purposes. Ensure that the sample surfaces are fully exposed to the spray.
5. Salt spray testing: Adjust the salt spray test chamber to the appropriate temperature and humidity levels specified by the standard. Spray the saltwater solution onto the sample surfaces as required. The testing duration may range from 24 hours to 1000 hours, depending on the specific standard.
6. Post-testing procedures: After the test is complete, remove the samples from the test chamber and clean and evaluate them. Carefully clean the samples using suitable methods and solvents to avoid damaging the surfaces. Assess the degree of corrosion according to the standard requirements.
7. Recording and analyzing results: Record the test results and perform an analysis. Evaluate the corrosion resistance performance of the samples based on the results. If required, conduct statistical analysis and compare results from different samples or under different testing conditions.

In summary, adherence to specific criteria and operating procedures is crucial to ensure the accuracy and comparability of salt testing results. By following the correct criteria and procedures, the corrosion resistance performance of materials can be evaluated, providing important insights for product design and quality control. Different industries or companies may have specific criteria and requirements, so adjustments and selections should be made according to the specific circumstances. Effective salt testing can help companies enhance product quality and durability, leading to increased competitiveness.

Precautions for using a salt spray test chamber:
1. Before using the salt spray test chamber, check that the fogging tube on the equipment is properly connected to ensure the proper functioning of the test chamber. If the fogging tube is not properly connected, water can block the pipes and affect the progress of the test.
2. If the test chamber will not be used for a long period of time, the water in the saturator should be drained. During regular use, the water in the saturator should be replaced periodically.
3. Do not manually pour sodium chloride solution into the pressure tank. First, clean the measuring cylinder for the solution with distilled water before adding the necessary amount. These salt solutions can be highly hazardous to the human body, so caution must be exercised during the testing process.
4. Before conducting the test, ensure that the air inside the chamber is dry. If there is moisture present, it should be promptly removed, as it can affect the test results.

Salt Spray Test Chamber | Salt Fog Test | ASTM B117 Salt Spray ChamberSalt Spray Test Chamber is applicable to the salt spray corrosive test for the protection layer of components, parts, electronic and electrical parts and metal materials and industrial products. The salt fog test chamber meets the following standards: IEC60068-2-11 (GB/T2423.17), GB/T10125, GB/T1771, ISO9227, ASTM-B117, GB/T2423-18, QBT3826, QBT3827, IEC 60068-2-52, ASTM-B368, MIL-STD-202, EIA-364-26, GJB150, DIN50021-75, ISO3768, 3769, 3770; CNS 3627, 3885, 4159, 7669 etc.

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