ASTM B117 Salt Spray Testing: The Gold Standard for Corrosion Testing

What is ASTM B117 Salt Spray Test? ASTM B117 Salt Spray Test, also known as the Salt Fog Test, is a standardized method used to determine the corrosion resistance of materials or coatings. This test creates an accelerated corrosive environment by subjecting the test specimens to a continuous and controlled salt spray mist. The purpose is to simulate various weathering conditions, such as coastal or industrial environments, where the risk of corrosion is high.

Corrosion is a major concern for industries that rely on metals and alloys, such as automotive, aerospace, and marine. It can lead to significant damage, decreased lifespan, and increased maintenance costs. To combat these issues, various methods are employed to test the corrosion resistance of materials. One of the most widely recognized standards for corrosion testing is ASTM B117 Salt Spray Testing. ASTM B117 Salt Spray Testing serves as the gold standard for corrosion testing, providing valuable information about the corrosion resistance of materials and coatings.

This widely recognized test, Following ASTM standards, Enables manufacturers to choose suitable materials for specific environments, enhance product performance, and increase customer satisfaction. By incorporating the ASTM B117 salt spray test into their quality assurance processes, industries can mitigate the detrimental effects of corrosion and prolong the lifespan of their products.

astm b117 salt spray
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

In addition to the step-by-step overview of the ASTM B117 salt spray test procedure, It is important to note that this test is commonly used in the corrosion resistance testing of various materials and coatings. The duration of the test can range from a few hours to several hundred hours, dependent on the specific requirements of the test. After the ASTM B117 salt spray test has been completed, The test specimen is evaluated based on the appearance of corrosion products, such as rust, as well as other criteria specific to the test requirements.

This ASTM B117 salt spray test is widely recognized in the industry and is often referenced in material and coating specifications. It is important to note that while the test can provide valuable information, It should not be used as a sole determinant of material or coating performance in real-world applications. Additional testing and evaluation, such as exposure to specific environmental conditions, May be required to fully assess the performance of a material or coating.

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The salt spray test is widely used in industries such as automotive, aerospace, and marine to evaluate the durability and performance of materials and coa

The ASTM B117 salt spray test follows a set of standards defined by the American Society for Testing and Materials (ASTM). These standards ensure uniformity and consistency in the testing process, enabling accurate comparisons between different materials and coatings. The most common ASTM standard for salt spray testing is ASTM B117-19, which provides detailed guidelines for conducting the test and evaluating the results.

The results of the ASTM B117 salt spray test provide valuable insights into the performance and durability of materials or coatings. The corrosion resistance is typically assessed based on the appearance and extent of corrosion on the test specimens. The evaluation criteria may vary depending on the specific industry and application requirements. By comparing the results against established standards, manufacturers can make informed decisions about the suitability of materials for specific environments.

The specimens are thoroughly cleaned and, if required, coated with the material or coating being tested. 1. Preparation of Test Specimens:
The test specimens are placed in a specially designed salt spray chamber, which ensures consistent and controlled conditions throughout the test. 2. Salt Spray Chamber Setup:
A concentrated salt solution is mixed with deionized water to create the desired salt spray solution. The solution is carefully regulated to maintain the required salinity and pH level. 3. Salt Spray Solution Preparation:
The specimens are exposed to the salt spray mist within the chamber for a specified number of hours. This duration varies depending on the test requirements and the materials being evaluated. 4. Test Specimen Exposure:
After the exposure period, the specimens are removed from the chamber and thoroughly examined for signs of corrosion, such as rust, blisters, or discoloration. The extent of corrosion is evaluated visually or by measuring the corrosion products. 5. Evaluation of Corrosion Resistance:
salt spray cabinet

The ASTM B117 salt spray test has found applications in a wide range of industries where the resistance to corrosion is a crucial consideration. For instance, in the aerospace industry, The salt spray test is performed to evaluate the durability and sustainability of metal components that are exposed to harsh environments, such as saltwater spray. In the automotive industry, Tests are conducted on automotive parts, coatings, and finishes to examine their suitability for use under extreme weather conditions.

The marine industry uses these tests to ensure that marine equipment and offshore structures such as pipelines and vessels can withstand the corrosive effects of saltwater. The ASTM B117 salt spray test’s wide-ranging applications make it an essential tool in determining the durability and reliability of materials used in numerous industries, ranging from manufacturing to construction.

Salt spray testing helps assess the effectiveness of protective coatings on car parts, such as exteriors, chassis, and underbody components, which are exposed to harsh road conditions and deicing salts. Automotive Industry:
Components used in aircraft, such as airframes, wings, landing gears, and engine parts, undergo salt spray testing to ensure their resistance to corrosive gases, moisture, and salt-laden atmospheres during flight and storage. Aerospace Industry:
Saltwater environments pose significant corrosion challenges. Salt spray testing is employed to evaluate the ability of marine coatings, naval equipment, and offshore structures to withstand the aggressive marine environment. Marine Industry:
Manufacturers of protective coatings and surface treatments utilize salt spray testing to validate and improve their product formulations. This ensures that their coatings meet or exceed industry standards and customer expectations. Coating Manufacturers:
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