Salt Fog Testing: How to Protect Your Products from Corrosion

Salt fog testing, also referred to as salt spray testing, is an internationally recognized and standardized method employed to evaluate the susceptibility of various materials, coatings, and finished products to corrosion. This rigorous testing procedure aims to replicate extreme and corrosive conditions typically found in salt-infested environments, notably coastal regions and industrial atmospheres where corrosion incidents are prone to transpire. By subjecting test samples to a continuous, controlled saline mist, salt fog testing effectively mimics the detrimental effects of salt-laden environments, enabling manufacturers and researchers to assess the long-term durability and corrosion resistance of their products.

As a valuable tool in the development and quality control processes, this form of testing aids in identifying vulnerabilities, optimizing material selection, and improving overall product performance in challenging environments. Such meticulous evaluation ensures that solutions can be tailored to withstand the deleterious impact of corrosion, fortifying reliability and extending the lifespan of various materials and products across industries. To conduct salt fog testing, a controlled environment is required. Salt fog test chambers are designed specifically for this purpose. These chambers create a controlled atmosphere where a solution of salt and deionized water is atomized and sprayed onto the test specimens.

salt fog testing
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

Salt fog testing offers several advantages in corrosion assessment. First, It provides a rapid and accelerated evaluation of corrosion resistance compared to natural exposure tests, which may require months or years. By condensing the test duration, manufacturers can efficiently assess the performance of their products and coatings in a shorter period. Furthermore, Salt fog testing allows for controlled environments, enabling consistent and repeatable testing, as opposed to unpredictable natural environments where variables are harder to control.

Salt fog testing helps manufacturers identify weaknesses in product designs, coatings, or materials concerning corrosion resistance. By pinpointing areas vulnerable to corrosion, appropriate measures can be implemented to improve product quality and reliability. This may include selecting corrosion-resistant materials, improving coating formulations, or implementing protective measures like sacrificial anodes or coatings with higher resistance to salt fog exposure.

icon of corrosion test chamber

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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

In today’s competitive market, Ensuring the durability and reliability of products is crucial. Salt fog testing provides an effective method to assess corrosion resistance and identify areas for improvement. By subjecting products to simulated salt-laden environments, companies can take proactive steps to protect their products from corrosion, enhancing customer satisfaction and reducing maintenance costs. Incorporating salt fog testing into your quality control processes will undoubtedly contribute to the longevity and performance of your products in corrosive environments.

Salt fog testing is particularly relevant for aluminum, as it is prone to corrosion in salt-laden environments. Aluminum, When exposed to salt fog, undergoes a corrosion process known as pitting, which compromises its structural integrity. Salt fog testing facilitates the assessment of aluminum’s corrosion resistance and aids in the development of protective coatings or surface treatments that can mitigate the effects of corrosion. The specimens are exposed to this corrosive environment for a predetermined period, allowing for the evaluation of their corrosion resistance.

salt spray cabinet

Corrosion is a critical issue for many industries, as it can cause equipment failure, safety hazards, unpredictable maintenance costs, and reduced product lifespan. Salt fog testing is a widely used method to evaluate the corrosion resistance of materials and coatings. It involves exposing samples to a highly corrosive environment created by a precisely controlled salt spray. This test helps identify how susceptible the samples are to corrosion and how durable they are under harsh conditions.

The results of salt fog testing can be used to select the most appropriate coating or material for a specific application or to optimize the design of a product or infrastructure. By choosing the right materials and coatings, industries can extend the lifespan of their products, reduce maintenance costs, and enhance their reputation for quality and reliability. Therefore, understanding the effectiveness of salt fog testing is critical for industries that want to ensure the longevity and performance of their products and infrastructure.

Several standards govern salt fog testing, with ASTM B117 being the most widely recognized. ASTM B117 provides guidelines for conducting salt fog testing and defines test conditions, such as salt concentration, temperature, and exposure duration. Adhering to these standards ensures consistency and comparability of test results across different industries. ASTM B117 Salt Fog Testing
The procedure for salt fog testing involves preparing the test samples, placing them in the salt fog test chamber, and initiating the test cycle. The test specimens should be carefully cleaned and pretreated, ensuring their surfaces are free from contaminants. Once the samples are secured in the test chamber, the salt fog is sprayed onto them for the specified duration. After the exposure period, the samples are evaluated for signs of corrosion, such as rust formation or coating degradation. Salt Fog Test Procedure:
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