What is the composite salt spray test standard of the composite salt spray test chamber

The composite salt spray test chamber, also known as the programmable composite salt spray testing machine, breaks through the concept of traditional salt spray chambers. In addition to having the functions of regular salt spray testing machines, it also combines the functions of alternating (cyclic) salt spray testing, providing testing environments such as idiomorphic corrosion and filamentous corrosion, and providing testing environments such as hot air drying, humid heat, forced drying, and salt spray.

Compared with traditional salt fog test chamber s, the effects of cyclic corrosion such as salt spray, drying, and humid heat on products are more practical because products are transported, stored, and used in dry and wet environments. Therefore, accelerated corrosion testing machines should be able to simulate this environment more realistically. Foreign research has also shown that cyclic corrosion is not close to outdoor corrosion in terms of corrosion rate, structure, and morphology, and has an excellent correlation with outdoor corrosion, And it is included in the commonly used testing category, and more and more tests in the automotive industry require multi-step aggregation. Combine salt spray, drying, and moisture heat for circulation.

The principle of a composite salt spray test chamber:
1. Aerosol effect: During the aerosol effect period, the composite salt spray test chamber is only used for general salt spray testing.
2. Low temperature drying effect: During the low temperature drying period, the blower motor sends indoor air quality through the air heater and then into the chamber, generating a low temperature drying standard. The temperature of the chamber is controlled by the electric heater and air heater.
3. Moisture effect in the body: During the period of moisture effect in the body, hot water vapor is blown into the chamber to maintain the chamber at 100% air humidity standard, and the electric heater of the gas steam boiler maintains the temperature of the programmed trading chamber.
4. Water removal effect: During the water removal period, the test chamber is formed by gas compression to discharge water vapor from the chamber.

Characteristics of composite salt spray test chamber:
1. The equipment structure design is advanced and reasonable, and the supporting products and functional components have advanced domestic levels, which can adapt to long-term stable, safe, and reliable testing needs. And it is easy to use, operate, and maintain, with a long service life, beautiful appearance, and a good user interface, making user operation and monitoring more simple and intuitive.
2. The main components of the equipment are selected from high-quality products from well-known international and domestic brands to ensure the quality and performance of the entire machine.

3. The equipment breaks through the concept of traditional salt spray chambers, and has the function of salt spray corrosion, combined with the function of alternating (cyclic) salt spray testing, providing testing environments such as salt spray, damp heat, and freezing. Compared with traditional salt spray chambers, the effects of cyclic corrosion such as salt spray, drying, humid heat, and freezing on products are more practical because products are transported, stored, and used in dry and wet environments. Therefore, accelerated corrosion testing machines should be more practical in simulating this environment. Foreign studies have also shown that cyclic corrosion is very close to outdoor corrosion in terms of corrosion rate, structure, and morphology, It has an excellent correlation with outdoor corrosion and is included in the commonly used testing category. More and more automotive industry tests require multi-step cycling that combines salt spray, drying, damp heat, and freezing.

4. The inner chamber is designed for placing two layers of samples. In order to improve the performance of the test chamber, two layers of sample placement have been specially designed. The upper layer can be used for small hanging component testing and standard sample testing, while the lower layer can be used for testing larger three-dimensional components, greatly increasing the usable area of the test chamber.
5 .Two stage inlet pressure reduction ensures stable spray pressure.
6. imported anti clogging nozzles, corrosion-resistant, small in size, and uniform in sedimentation.
7. Complete protection functions (water shortage, excessive humidity, overload, etc.) and equipped with sound, alarm, and shutdown functions.
8. Saturate the compressed air used for spray to ensure stable test environment conditions and effectively prevent nozzle blockage.

The composite salt spray test usually consists of three parts: salt spray test stage, wet test stage, and dry test stage.
Salt spray test stage: Generally speaking, in addition to sodium chloride, electrolytes containing other chemicals can also be used to simulate acid rain or other industrial corrosion.
Wet test stage: The testing program usually requires high humidity conditions, with a relative humidity requirement of 95-100%.
Drying test stage: The relative humidity of the sample during the drying stage is generally ≤ 30%.

Result determination:
The function must be normal, and product failure or performance parameters exceeding the design margin are considered unqualified;
Corrosion causing a reduction of more than 25% in any structural physical properties is considered unqualified (including but not limited to important product parameters such as yield strength, hardness, penetration strength, mass, and bending impedance);
The exposed surface should not exhibit corrosion, neither the coating nor the substrate should corrode, and there should be no adverse phenomena such as bubbles or cracks that affect the appearance and image of the product.
On non exposed surfaces, the substrate should not exhibit corrosion, the corrosion depth of the coating should not exceed 5% of the surface, and the corrosion area should not exceed 10%;
Comparison between composite salt spray test and neutral salt spray test:
Composite salt spray test and neutral salt spray test are common methods for testing the corrosion resistance of materials or products, but there are differences in testing conditions and results.

1. Test conditions
The test solution for neutral salt spray test is 5%! MISSING sodium chloride aqueous solution, pH value 6.5-7.2, temperature 35 ℃, humidity 95%!. The MISSING composite salt spray test is based on the neutral salt spray test, adding sulfur vapor and nitrogen oxide to simulate a more severe corrosion environment.

2 .Test results
The neutral salt spray test is mainly used to test the corrosion resistance of general anti-corrosion materials and coatings, while the composite salt spray test is more suitable for testing the corrosion resistance of high demand products, such as components and coatings in industries such as automobiles, electrical appliances, aerospace, etc. In terms of test results, the corrosiveness of the composite salt spray test is stronger, which can more realistically simulate the corrosion situation in the actual use environment, making the evaluation of the corrosion resistance performance of the product more accurate.
Overall, both neutral salt spray test and composite salt spray test are effective testing methods, but there are differences in testing conditions and results. The specific method chosen should be evaluated based on actual needs.

 YWX/Q-150X series Composite Salt Spray Test Machine fullly compliance with GB/T 2423. 18, GB/T-10125, IEC 60068-2-11, GMW 14872, TCSAE 71, VCS 1027_1449, PV 1210,etc standards requirements. It do measurement through simulating conditions that are more commonly encountered in the natural environment such as  salt spray, hot air drying, humidity, low temperature combined and loop in any order. It is widely used to test items used in drastically changing environments, such as automobile parts, aviation equipment, building materials, coating, electric and electrical machinery so on.

Composite Salt Spray Test Machine YWX/Q-150X

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