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ASTM Salt Spray Testing: The Ultimate Guide to Corrosion Protection

The ASTM salt spray test serves as a valuable tool in evaluating the corrosion resistance and durability of materials and coatings. By subjecting test specimens to controlled salt fog, The test provides accelerated corrosion conditions, enabling manufacturers to make informed decisions and improvements in product design, material selection, and coating techniques. Adhering to the ASTM B117 standard ensures consistency, accuracy, and reliable results across different industries. Understanding and implementing the ASTM salt spray test is crucial for achieving effective corrosion protection and ensuring the long-term performance of products in demanding environments.

The ASTM salt spray test, also known as ASTM B117 test, is a widely recognized industry standard for evaluating the corrosion resistance of metals and coated materials. It mimics the natural corrosive environment, particularly those found near coastal areas with high levels of salt content in the air. By subjecting test specimens to a controlled salt spray, The ASTM salt spray test aims to simulate and accelerate the corrosion process, allowing engineers and manufacturers to assess the durability and effectiveness of various protective coatings and materials.

astm salt spray test
Equipment Model NSS-ACSS-270L NSS-ACSS-800L NSS-ACSS-2700L
Internal Dimensions (mm) 900*500*600 1600*500*1000 2000*600*1200
Overall Dimensions (mm) 1400*1280*900 2300*1400*1300 2700*1500*1500
Interior Volume (L) 270 Liters 800 Liters 1450 Liters
Temperature Range Ambient +60 ℃ RT10℃ ~ +60℃ RT10℃ ~ +58℃
Temperature Fluctuation ± 0.5 ℃ ± 0.5 ℃ ± 1.0 ℃
Temperature Deviation ± 2.0 ℃ ± 2.0 ℃ ± 2.0 ℃
Spraying System Atomizer Tower, Spray Nozzles Atomizer Tower, Spray Nozzles Atomizer Tower, Spray Nozzles
Humidity Range 95% ~ 98% RH 95% ~ 98% RH 90% ~ 98% RH
Salt Fog Deposition 1~2ml / 80cm2 · h 1~2ml / 80cm2 · h 1~2ml / 80cm2 · h
Salt Spray Type Continuous / Periodic Continuous / Periodic Continuous / Periodic
Heating Element Nichrome Heater Nichrome Heater Nichrome Heater
Salt Fog Collected Fog Collector and  Fog Measure Cylinder Fog Collector and 
Air Preheating Saturated Air Barrel (25 Liter) Saturated Air Barrel (40 Liter) Saturated Air Barrel (40 Liter)
Controller System PID Controller + LED PID Controller + LED PID Controller + LED
Temperature Sensor PT100Ω / MV A-class PT100Ω / MV A-class PT100Ω / MV A-class
Material Type Glass Fiber Reinforced Plastics Glass Fiber Reinforced Plastics Glass Fiber Reinforced Plastics
Standard Configuration 6 Round Bbars and  5 V-shaped Grooves 6 Round Bbars and 
Power Supply 220V 50Hz, 1 Phase 220V 50Hz, 1 Phase 220V 50Hz, 1 Phase
Maximum Noise 60 dBA 60 dBA 65 dBA
Environmental Terms +5℃~+35 ℃ ≤85% RH +5℃~+35 ℃ ≤85% RH +5℃~+35 ℃ ≤85% RH
Testing Standard ASTMB117, ISO9227 ASTMB117, ISO9227 ASTMB117, ISO9227

The ASTM salt spray test has become a critical tool in assessing the quality and longevity of coatings and materials in environments with high levels of salt content in the air. These environments can be particularly harsh on metal structures, equipment, and coatings, causing significant damage and deterioration over time. The ASTM salt spray test allows manufacturers to identify the most effective coatings and materials for use in coastal areas and other corrosive environments, ultimately leading to more durable and reliable products.

In addition to evaluating corrosion resistance, The ASTM salt spray test can also be used to compare different coatings and materials and identify any potential weaknesses or areas for improvement. As a recognized industry standard, The ASTM salt spray test offers valuable insights to engineers, manufacturers, and consumers on the longevity, effectiveness, and durability of different products in harsh environmental conditions.

The ASTM B117 salt spray test procedure follows specific guidelines to ensure consistent and accurate results. It involves exposing test specimens to a continuous salt fog for a predetermined duration, typically measured in hours. The test chamber used for this procedure is specially designed to maintain the desired environmental conditions, including temperature, humidity, and salt concentration. The test specimens are visually inspected at regular intervals to assess the extent of corrosion and determine the test duration required to reach a specific corrosion level. ASTM B117 Salt Spray Test Procedure
The duration for conducting the ASTM B117 salt spray test can vary depending on the requirements and industry standards. Common test durations include 24, 48, 72, or even up to 1,000 hours. The chosen test duration typically reflects the expected or desired durability of the materials and coatings being evaluated. The longer the test duration, the more severe the corrosion and the better the assessment of long-term performance and protection. ASTM B117 Salt Spray Test Hours
The results of the ASTM B117 salt spray test are based on the visual inspection of the test specimens after the designated test duration. The evaluation includes assessing the appearance of corrosion, such as the formation of blisters, rust, or other surface abnormalities. Additionally, measurements like the extent of corrosion, corrosion spread, and coating adhesion are recorded. These results play a crucial role in determining the suitability of materials or coatings for specific applications and aid in product development and quality control processes. ASTM B117 Salt Spray Test Results
salt spray cabinet

What is ASTM B117 Salt Spray Test? The ASTM B117 salt spray test is an empirical method to evaluate the corrosion resistance of materials and coatings when exposed to a salt-laden environment. As mentioned earlier, it provides accelerated corrosion conditions, enabling manufacturers to determine the durability and effectiveness of their products. By subjecting the test specimens to a controlled salt fog, the test simulates the corrosive effects caused by saltwater exposure, helping identify potential weaknesses and areas for improvement.

The ASTM salt spray test is governed by the ASTM B117 standard, which provides comprehensive guidelines and procedures for conducting the test. This standard ensures consistency and reliability across different industries and allows for meaningful comparisons between products and coatings. ASTM salt spray test provides detailed instructions for preparing test specimens, operating the salt spray chamber, conducting visual inspections, and reporting the results. Adhering to the ASTM standard is essential to ensure accurate and reproducible testing.

ASTM B117 salt spray testing is widely performed in various industries, including automotive, aerospace, marine, electronics, and more. It is used to assess the corrosion resistance of materials such as metals, alloys, plated or coated surfaces, and even organic or inorganic coatings. Manufacturers and engineers rely on these test results to make informed decisions about material selection, coating application methods, and product design improvements. This testing method ensures that the final products meet industry standards, perform reliably, and have extended lifetimes even in harsh environments.

Corrosion is a significant concern for many industries, especially those dealing with metal products. To ensure the longevity and performance of these products, various corrosion protection methods are implemented. One such method is the ASTM salt spray test, which assesses the corrosion resistance of materials or coatings. In this article, we will provide a comprehensive guide to understanding and implementing the ASTM salt spray test, along with its critical procedures and results.

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