Salt SprayCorrosionASTM B117Coating
Published: 19 Jun 2026By Sohm Analytical Team
What Is Salt Spray Testing
Salt spray testing also called salt fog testing is an accelerated corrosion test used to evaluate the corrosion resistance of coated and uncoated metal samples. The sample is exposed to a controlled saline mist environment inside a sealed test chamber.
ASTM B117 Standard
ASTM B117 is the most widely used standard for salt spray testing. It specifies:
- 5 percent NaCl solution
- 35 degrees C test chamber temperature
- Continuous salt mist exposure
Interpreting Results
The test duration determines the result category:
- Fog Test: Visual assessment of corrosion products
- Protection Time: Hours before corrosion begins
- Corrosion Resistance: Comparative rating of coating performance
Common test durations:
- 24 hours — Basic screening
- 48 hours — General industrial applications
- 96 hours — Marine environments
- 200 plus hours — Severe corrosive conditions
What the Results Tell You
- Coating performance: How well protective coatings resist corrosion
- Material selection: Which alloys perform best in corrosive environments
- Quality control: Whether finished products meet specification requirements
When Is Salt Spray Testing Needed
- Before implementing protective coatings
- For automotive and industrial components
- When selecting materials for marine environments
- Quality assurance for imported components
---
Need salt spray testing for your project Contact Sohm Analytical for NABL-accredited testing in Navi Mumbai.