In the laboratory of an automobile factory, a salt spray test chamber is in continuous operation. The surface of the brake caliper tested has been spotted with rust, and engineers are recording corrosion data at 768 hours.
Such scenes are staged every day in major car companies around the world, which confirms the key position of salt spray test in automobile quality control. With the increase of consumers' requirements for vehicle durability, the salt spray test chamber has become an indispensable "corrosion laboratory" in the automotive industry.
The working principle of the salt spray test chamber is the accurate restoration of the natural environment. Through the precision atomization system, the 5% concentration of sodium chloride solution is converted into salt spray particles with a diameter of only 1-5 microns, forming a high-concentration corrosive atmosphere in a constant temperature environment of 35℃. This accelerated corrosion test simulates years of natural corrosion in coastal areas, pushing the "fast forward button" for product validation.
Taking the DIN 50021 standard adopted by Volkswagen as an example, its core parameter system includes:
Atomization control: 1.5ml/h·80cm² precision spray
Temperature control accuracy: ±1℃ constant temperature guarantee to ensure the consistency of test conditions
PH value balance: 6.8 neutral environment simulation, restore the real road melting agent corrosion scene
Circulation system: 3 air displacements per hour to maintain a dynamic corrosion environment
Temperature Range | Ambient ～ +60 ℃ |
Temperature Fluctuation | ± 0.5 ℃ |
Temperature Deviation | ± 2.0 ℃ |
Humidity Range | 95% ~ 98% RH |
Salt Fog Deposition | 1～2ml / 80cm2 · h |
Spray Type | Continuous / Periodic |
Salt Fog Collected | Fog collector and fog measure cylinder |
Air Preheating | Saturated air barrel |
Spraying System | Atomizer tower and Spray nozzles |
Controller | PID controller |
Safety Device | Humidifier Dry-combustion Protection; Over-temperature Protection; Over-current Protection; Water Shortage Protection; Earth leakage Protection |
Material | Glass fiber reinforced plastics |
Standard Configuration | 6 round bars and 5 V-shaped grooves |
The body and chassis of a car are the most vulnerable parts to corrosion, especially in coastal cities or cold areas, where salt is suspended in the air and the vehicle is frequently exposed to salty moisture. Salt spray test chambers test the corrosion resistance of body metal, chassis and other exposed components. The chassis components of the Mercedes-Benz G-Class off-road vehicle are subjected to 1008 hours of salt spray test to ensure that they do not rust on the salt road for 10 years.
Many auto parts (such as doors, hoods, wheels, etc.) are painted, chromed, or galvanized to enhance appearance and corrosion resistance. The salt spray test chamber ensures that the quality of the coating process meets the standard requirements of the automotive industry.
The Tesla battery connector has increased its corrosion resistance life from 5 to 8 years through improved salt spray test (adding SO2 gas) .Volvo adopts cyclic salt spray test (alternating dry and wet), which improves the corrosion resistance of bolts by 40%.
The use environment of automobiles is very different, and the climatic conditions in different regions have different effects on the corrosion of automobiles. LIB can customize the salt spray test chamber according to the specific needs of customers, such as size, increase functions, etc.
With the development of technology, the salt spray test chamber itself is also constantly innovating. The new test chamber may integrate more advanced features, such as more accurate corrosion rate detection, more comprehensive environmental simulation, etc., making it better able to adapt to the constant changes and technological upgrades in the automotive industry.
Industry standards are also being upgraded, with the latest version of ISO 9227 adding a cyclic corrosion test method that requires the test chamber to have automatic temperature and humidity regulation.
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