What is salt spray test as per ASTM B117?

Apologies for the confusion in my previous response. Let me provide you with a more accurate description of the salt spray test as per ASTM B117.

ASTM B117 is the standard test method for operating salt spray (fog) apparatus, and it outlines the procedure for conducting a salt spray corrosion test. The test is designed to simulate and assess the corrosion resistance of metallic materials and coatings when exposed to a salt-laden environment.

Here are the key aspects of the salt spray test according to ASTM B117:

1. Test Setup: A test chamber or cabinet is used to create a controlled environment for the test. The chamber typically includes a salt solution reservoir, an atomizer or spray nozzle, and a means to maintain a constant temperature and humidity level.

1. Salt Solution: The test uses a salt solution, usually a 5% sodium chloride (NaCl) solution, although other concentrations or specific solutions may be used based on the test requirements or relevant standards.

1. Test Specimens: Metallic materials or coated samples, prepared according to the relevant specifications, are placed in the test chamber. The specimens are positioned to allow uniform exposure to the salt spray.

1. Test Conditions: The test chamber is set to operate at a specific temperature, typically 35°C (95°F). The salt spray is atomized and sprayed onto the specimens continuously during the test period.

1. Test Duration: The duration of the test can vary depending on the requirements, but common test durations range from 24 to 1,000 hours or more. The specific test duration is determined by the applicable standard, industry specifications, or specific testing needs.

1. Evaluation: After the test period, the specimens are removed from the chamber and evaluated for corrosion effects. The evaluation typically involves visual inspection of the specimens for signs of corrosion, including rust formation, blistering, or other types of coating degradation.

It's important to note that ASTM B117 primarily provides guidelines for the operation of the salt spray apparatus and the general test procedure. The acceptance criteria or evaluation standards for corrosion effects may be specified in other industry-specific standards or specifications that are referenced alongside ASTM B117.

For detailed instructions, specific test conditions, and evaluation criteria, it is crucial to consult the latest version of ASTM B117 or adhere to the applicable standards relevant to your industry or specific testing requirements.