ASTM B117: Standard Practice for Operating Salt Spray Tester

ASTM B117 is a widely recognized standard published by ASTM International that provides guidelines for operating a salt spray tester, also known as a salt fog chamber or salt spray cabinet. A salt spray tester is a laboratory instrument used to simulate and evaluate the corrosion resistance of materials and coatings exposed to a salt-laden environment.

Here are some key points covered in ASTM B117 regarding the operation of a salt spray tester:

1. Test Chamber:The standard specifies the requirements for the design and construction of the test chamber. It includes details such as the dimensions, material, and sealing mechanisms to ensure proper operation and containment of the salt spray.

2. Test Solution:ASTM B117 provides guidelines for preparing the salt solution used in the test. The standard specifies the composition of the solution, typically a 5% sodium chloride (NaCl) solution, and may include additional requirements for pH adjustment and chemical purity.

3. Test Conditions:The standard defines the test conditions, including temperature, humidity, and duration of the test. The most common test condition is a continuous exposure to a salt spray at a temperature of 35°C (95°F). The duration of the test can vary depending on the specific application and requirements.

4. Test Specimens:ASTM B117 describes the preparation and mounting of test specimens in the test chamber. It provides guidelines on the size, shape, and orientation of the specimens to ensure consistent and reproducible results.

5. Monitoring and Evaluation:The standard outlines procedures for monitoring and evaluating the test specimens during and after the test. This includes regular inspection, measurement of corrosion products, and assessment of any changes in appearance or performance.

6. Test Report:ASTM B117 specifies the information that should be included in the test report. This typically includes detailssuch as the test conditions, specimen preparation, duration of exposure, observations, and any relevant test results or measurements.

It's important to note that ASTM B117 provides general guidelines for operating a salt spray tester, but it does not cover specific test methods or acceptance criteria for corrosion resistance. Different industries and applications may have their own specific standards or requirements that should be followed in conjunction with ASTM B117.

When operating a salt spray tester, it is crucial to carefully read and understand the entire ASTM B117 standard to ensure compliance with the recommended practices. Additionally, regular maintenance, calibration, and validation of the test equipment are necessary to ensure accurate and reliable results.