Hiểu biết về ASTM B117 cho Máy thử phun muối
Ngày phát hành:12/05/2025 Phân loại:Bài viết kỹ thuật Lượt xem:10802
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
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How to Select a Salt Spray Chamber for ASTM B117
Volume, atomizer quality, and control features that matter
Decision 1 — Chamber Volume
Match chamber volume to your largest specimen. A 270 L chamber fits panels up to 150×300 mm and is the lab workhorse. A 480 L chamber is the most common industrial size. 110 L chambers are entry-level for fastener QC. 800–2000 L chambers are for large automotive body panels and aerospace components.
Decision 2 — Chamber Material
PP (polypropylene) and PVC are the most common. FRP (fiberglass-reinforced plastic) is more durable for continuous operation. Stainless steel is unsuitable (corrodes in salt spray). For ASTM B117 compliance, the chamber material does not affect test results as long as it is corrosion-resistant and does not contaminate the spray.
Decision 3 — Atomizer Quality
The atomizer is the heart of the chamber. Look for: (1) 0.7mm nozzle diameter, (2) borosilicate glass saturator tower to humidify and warm the air, (3) two atomizers for redundancy, (4) adjustable atomizer pressure gauge. Cheap atomizers produce inconsistent droplet size and clog quickly — this is the #1 reason for failed B117 tests.
Decision 4 — Solution Tank & Plumbing
40 L external solution tank is standard. Confirm the tank has a level sensor (alarms when low) and is plumbed to the atomizer via corrosion-resistant tubing (PTFE or PP). For ASTM B117, the solution should be replaced every 7 days maximum, even if the tank is not empty.
Decision 5 — Data Logging
ASTM B117 §11 requires continuous temperature recording. A chamber with built-in data logging (chamber temp, pH, spray rate) creates a defensible audit trail. For ISO 17025 accredited labs, look for calibration certificates traceable to NIST or NIST-equivalent.
Chamber Construction, Maintenance, and Safety
Long-term reliability and operator safety considerations
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Câu hỏi thường gặp
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Sự khác biệt giữa ASTM B117 và ISO 9227 là gì?
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