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Efficiency is key when it comes to testing metal durability and corrosion resistance. That’s the role ASTM and its broadly used standard B117 play, and knowing them can be a game-changer for manufacturers, engineers, and quality control personnel alike.
What is ASTM?
Table of Content
The full meaning of ASTM is American Society for Testing and Materials. An international organization that publishes standards to ensure that materials, products, and systems work safely, reliably, and consistently across the world.
What is ASTM B117?
ASTM B117 is the standard for salt spray (fog) testing, and it has an official title as follows:
“Standard Operating Practice for Salt Spray (Fog) Apparatus.”
It establishes a monitored laboratory setting to mimic salt corrosion and is mainly used for:
- Paint / Galvanization / Plating — Testing Metal Coatings
- Evaluating raw metal corrosion resistance
- Material or protective coating comparison under identical conditions
How Salt Spray Testing Works
B117 method consists of a strict protocol:
- Preparation — Clean and mount specimens in the test chamber.
- Salt Solution – 5% sodium chloride(NaCl) solution.
- Spray Application – The answer here is to atomize the solution into a salt fog or fine mist.
- Temperature Management – Maintain ~35°C chamber conditions.
- Observation – Focus on samples’ exposure for hours or days.
- Inspection — Look for rust, blistering, or coating failure.
This speeds up corrosion, which then enables engineers to predict how materials might perform over the long term, and more quickly.
Why ASTM B117 Matters
- Certainty: Reproducible results between laboratories and industries.
- Quality Control: Identify weak coatings before product release.
- Prevent failures early, save on maintenance costs.
- Comparative Analysis: Evaluate material and coatings correctly.
- Tips for Accurate Testing
- Never skip ASTM B117 procedures.
- They get results consistent with using fresh salt solutions.
- Maintain proper chamber temperature.
- Keep careful records of exposure times and results.
Conclusion
ASTM B117 is not just a standard, but the secret sauce of reliable salt spray testing. ASC B117: The Key to Harsh Environments ASTM provides a standardized method for testing corrosion rates and ensuring material performance in harsh environments; by understanding ASTM and following the B117 specification, companies can ensure their materials stand up to those dew scrubbing systems, saving precious time, money, and reputation.
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