ASTM B117 ning tuzilishini va tuzilmalarini anglash uchun tuzilgan tuzilma
E'lon qilish vaqti:12/05/2025 Turi:Texnik maqolalar Ko'rishlar soni:10797
Understanding ASTM B117 for Salt Spray Test Machines: Setup, Compliance, and Best Practices
The definitive procurement and operations reference for ASTM B117 neutral salt spray (fog) testing — covering chamber design, solution preparation, specimen mounting, and the differences between ASTM B117, ISO 9227, and ASTM G85.
At a Glance
Why ASTM B117 Remains the Reference Salt Spray Standard
History, scope, and the cost of running B117 incorrectly
ASTM B117 — the Standard Practice for Operating Salt Spray (Fog) Apparatus — has been the dominant corrosion test standard for over a century. First published in 1939, it specifies the apparatus, test solution, operating conditions, and procedures for neutral salt spray (NSS) testing of metallic and non-metallic coatings. Despite the rise of more realistic cyclic corrosion tests like ASTM G85 and GM9540P, B117 remains the most-cited salt spray test in specifications across automotive, fastener, coating, and electronics industries.
A salt spray test machine for ASTM B117 compliance is a controlled environment chamber that atomizes a 5% sodium chloride solution into a fine mist, maintains chamber temperature at 35°C ± 1°C, and continuously exposes test specimens to this corrosive fog. The standard does not specify pass/fail criteria — it specifies how to run the test. Pass/fail criteria come from the product specification (e.g., 240 hours with no red rust = ASTM B117 + spec).
Derui Salt Spray Chamber: ASTM B117 Compliance Specs
Chamber, atomization, and control specifications
Chamber & Air System
Solution & Specimen
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Ko‘p so‘raladigan savollar
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ASTM B117 va ISO 9227 o‘rtasidagi farq nimada?
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What pH should the collected spray be?
6.5–7.2 for ASTM B117 NSS. Measure the pH of the spray collected in a clean beaker placed in the chamber (not the solution in the tank, which can differ). Adjust with dilute HCl (lower pH) or NaOH (raise pH). Recheck daily.
Can I run ASTM B117 and ASTM G85 in the same chamber?
Yes. The chamber hardware is the same. ASTM G85 A1 (acetic acid salt spray) uses the same atomizer and temperature; G85 A3 (prohesion) uses a different solution and a heated soak cycle. Most modern chambers support both via a programmable profile.
Why is my ASTM B117 test failing despite following the standard?
Most common causes: (1) atomizer clogged or dirty, (2) chamber temperature out of spec, (3) spray rate not 1–2 mL/80cm²/h, (4) solution pH drift, (5) specimen preparation inconsistent. Run the ASTM B117 §11 verification (temperature uniformity, spray rate, pH) before re-testing. Our Derui chambers include a verification procedure on the controller.
What is the cost of ASTM B117 chamber?
A 270 L ASTM B117 compliant chamber starts at $3,500–$5,000. 480 L chambers run $5,500–$9,000. Larger 800–2000 L walk-in chambers run $12,000–$30,000+. Pricing varies with control sophistication, data logging, and accessories. Contact Derui for a quote based on your chamber size and standard requirements.
