Corrosion is one of the leading causes of product failure in automotive, electronics, marine, aerospace, and industrial applications. A coating that appears durable outdoors may begin to rust, blister, or peel after prolonged exposure to salt-laden environments. Waiting months or years for natural corrosion to occur is often impractical during product development.
To accelerate evaluation, manufacturers rely on standardized salt fog testing to reproduce corrosive environments in a controlled laboratory setting. This article explains which salt is required for ASTM B117 Salt Fog Corrosion Testing, how the test differs from natural exposure, and how to select between a conventional LIB ASTM B117 Salt Fog Corrosion Test Chamber and a Cyclic Salt Fog Corrosion Test Chamber.
Salt For ASTM B117 Salt Fog Corrosion Test: Understanding the Fundamentals
1. Which Salt Is Used for ASTM B117, NSS, AASS, and CASS Testing?
The quality and composition of salt directly affect corrosion test accuracy. ASTM B117 and ISO 9227 require high-purity sodium chloride (NaCl) free from contaminants that could alter corrosion behavior.
Three common salt fog test methods are used worldwide:
| Test Type | Solution Composition | pH Range | Typical Application |
|---|---|---|---|
| NSS (Neutral Salt Spray) | 5% NaCl Solution | 6.5–7.2 | General corrosion testing |
| AASS (Acetic Acid Salt Spray) | 5% NaCl + Acetic Acid | 3.1–3.3 | Decorative coatings |
| CASS (Copper Accelerated Acetic Acid Salt Spray) | 5% NaCl + Acetic Acid + 0.26 g/L CuCl₂ | 3.1–3.3 | High-performance plated coatings |
ASTM B117 specifically requires a 5% sodium chloride solution prepared with purified water. The solution is atomized at approximately 83 kPa and deposited at 1–2 mL/80 cm²/hour within a chamber maintained at 35 ± 2°C.
2. Salt Fog Corrosion Testing vs. Natural Outdoor Exposure
Natural corrosion testing may require six months, one year, or even several years before meaningful results appear. Environmental factors
such as rainfall, humidity, temperature, pollutants, and coastal distance constantly change, making results difficult to compare.
Salt Fog Corrosion Testing accelerates the process by creating a controlled environment with fixed parameters. Salt concentration, temperature, pH value, spray rate, and exposure duration remain stable throughout testing. This allows manufacturers to obtain repeatable corrosion data within days or weeks instead of years.
For example, an automotive bracket that may require one year of coastal exposure can often be evaluated through accelerated salt fog testing within several hundred hours.
3. Standards Compliance and Industry Applications
ASTM B117 remains the most widely recognized salt fog corrosion standard globally. Many industries require compliance before products can enter the market.
Common standards include:
① ASTM B117 Salt Fog Corrosion Test
② ASTM G85 Modified Salt Spray Tests
③ ASTM D5894 Cyclic Corrosion Test
④ ISO 9227 NSS, AASS, CASS
⑤ SAE J2334 Automotive Cyclic Corrosion Test
⑥ DIN 50021
⑦ EN 60068-2-52
⑧ISO 11997
⑨ JIS Z 2371
These standards are widely applied in:
① Automotive components
② Fasteners and hardware
③ Electronic enclosures
④ Marine equipment
⑤ Aerospace structures
⑥ Fire protection devices
⑦ Industrial coatings and paints
Brazilian Customer Praises LIB Cyclic Salt Fog Corrosion Test Chamber Performance
During a recent after-sales performance verification project, a Brazilian customer evaluated coated automotive components using a LIB
Cyclic Salt Fog Corrosion Test Chamber.
The customer required testing according to ASTM B117, ASTM G85, SAE J2334, and ISO 9227 protocols. Their previous equipment struggled to maintain stable fog density during long test cycles, resulting in inconsistent corrosion results.
After installation and validation, the customer highlighted several advantages:
① Stable salt fog concentration throughout extended testing periods.
② Uniform chamber temperature maintained within ±0.5°C.
③ Precise humidity control reaching 98% RH.
④ Convenient removable specimen racks for faster loading and unloading.
⑤ Automatic transitions between salt spray, humidity, drying, and temperature phases.
⑥ Easy touchscreen programming for complex cyclic profiles.
The customer reported significantly improved test repeatability and expressed satisfaction with the chamber's compliance with ASTM B117, ASTM G85, ISO 9227, and SAE J2334 requirements.
LIB ASTM B117 Salt Fog Corrosion Test Chamber vs. Cyclic Salt Fog Corrosion Test Chamber
Choosing the right corrosion chamber depends on your testing objectives.
| Feature |
|
Cyclic Salt Fog Chamber |
| Main Function | Continuous Salt Spray | Multi-Phase Corrosion Cycles |
| Standards | ASTM B117, ISO 9227 NSS/AASS/CASS | ASTM B117, ASTM G85, ASTM D5894, SAE J2334, EN 60068-2-52 |
| Salt Solution | 5% NaCl | 5% NaCl + Programmable Cycles |
| Temperature Control | 35 ± 2°C | 10°C to 90°C |
| Humidity Control | Salt Fog Environment | 30–98% RH |
| Drying Function | No | Yes |
| Temperature Cycling | No | Yes |
| Automotive Testing | Basic | Highly Recommended |
| Equipment Cost | Lower | Higher |
| Real-World Simulation | Moderate | Excellent |
When Should You Choose an ASTM B117 Chamber?
Choose a standard Salt Fog Corrosion Test Chamber if you:
• Need ASTM B117 certification testing.
• Require NSS, AASS, or CASS testing.
• Focus on coating comparison and quality control.
• Need a cost-effective corrosion testing solution.
When Should You Choose a Cyclic Chamber?
Choose a Cyclic Salt Fog Corrosion Test Chamber if you:
• Develop automotive or transportation products.
• Require SAE J2334, ASTM G85, ASTM D5894, or EN 60068-2-52 testing.
• Need realistic wet-dry corrosion simulation.
• Want more accurate field-life prediction.
Popular Fog Corrosion and Climatic chambers
Cyclic Salt Fog Corrosion Test Chamber
Controlled Temperature, Humidity & Salt Spray for Realistic Simulation, Highly Popular.
ASTMB117 Salt Fog Corrosion Test Chamber
Temperature & Salt Spray Control Only, Precision Salt Spray Measurement, Standard Compliant.
ASTM G85 Salt And SO2 Salt Fog Corrosion Test Chamber
Controlled SO₂, Temperature, Humidity & Salt Spray for Industrial Environment Simulation.
Realistic Sunlight Simulation, Water-Cooled Lamp for Stability & Durability, Top Choice for Coating Companies.
UV Light Simulation Test, Stable Light Source, High Uniformity of Light Exposure.
Large Test Pieces, High-Volume Testing; Flexible Customization of Size & Function.
FAQs on the ASTM B117 Salt Fog Corrosion Test Chamber
Q1: What salt should be used in ASTM B117 testing?
ASTM B117 requires high-purity sodium chloride (NaCl) dissolved in purified water to create a 5% salt solution with a pH between 6.5 and 7.2.
Q2: Can one chamber perform NSS, AASS, and CASS testing?
Yes. LIB Salt Fog Corrosion Test Chambers can perform NSS, AASS, and CASS testing by adjusting solution composition and pH according to ISO 9227 requirements.
Q3: Can the Cyclic Salt Fog Chamber perform ASTM B117 tests?
Yes. LIB Cyclic Salt Fog Corrosion Test Chambers support continuous salt spray mode and fully comply with ASTM B117 requirements while also supporting advanced cyclic corrosion standards.
Q4: How long is LIB's warranty and technical support period?
Every LIB chamber includes a 3-year warranty and lifetime technical support. Our engineering team provides remote troubleshooting and operational guidance worldwide.
Q5: How are replacement parts delivered internationally?
LIB maintains an international logistics network and typically delivers spare parts within 7–15 days depending on destination and customs clearance requirements.
Q6: What happens if a major component fails?
If remote diagnosis cannot resolve the issue, LIB provides rapid service support and appropriate replacement solutions to minimize laboratory downtime.
Everything you need to understand and implement reliable corrosion testing-clearly presented in one practical guide. Contact LIB Industry today to discover how our Salt Fog Corrosion Test Chambers and Cyclic Salt Fog Corrosion Test Chambers can help validate product durability, accelerate development, and achieve international compliance.
