What materials need to be prepared for salt spray test? Professional third-party salt spray detection organization

Date：2022-07-04 17:18:36Views：714

What is salt spray test? Salt spray test is an accelerated corrosion resistance evaluation method of artificial atmosphere. It atomizes a certain concentration of salt water; Then spray it into a closed constant temperature box to reflect the corrosion resistance of the tested sample by observing the change of the tested sample after being placed in the box for a period of time. It is an accelerated test method. The salt concentration of chloride in the salt fog environment is several times or dozens of times that of the salt fog content in the general natural environment, which greatly improves the corrosion rate. The time to obtain the results of salt fog test on products is also greatly shortened. What materials should be prepared for salt spray test? In order to help you understand in depth, the following contents are sorted out by Chuangxin testing network for your reference.

Common standards for salt spray test

GB/T2423.17—1993； Basic environmental test procedures for electrical and electronic products Test Ka: salt spray test method,

GB/T2423.18—2000； Environmental tests for electric and electronic products Part 2: Tests Test Kb: salt spray, alternating (sodium chloride solution),

GB5938—86； Test method for corrosion resistance of metallic coatings and chemically treated coatings of light industrial products

Salt spray test method

1. Neutral salt spray test (NSS test)

It is an accelerated corrosion test method that appeared early and has been widely used in many fields. It uses 5% sodium chloride saline solution, and the pH value of the solution is adjusted to the neutral range (6 ~ 7) as the solution for spray. The test temperature is 35 ℃, and the sedimentation rate of salt spray is required to be 1 ~ 2ml/80cm2 H.

2. Acetate spray test (ASS test)

It is developed on the basis of neutral salt spray test. It is to add some glacial acetic acid to the 5% sodium chloride solution, so that the pH value of the solution is reduced to about 3, and the solution becomes acidic, and the salt mist formed later also changes from neutral salt mist to acidic. Its corrosion rate is about 3 times faster than that of NSS test.

3. Copper salt accelerated acetate spray test (CASS test)

It is a rapid salt spray corrosion test developed recently abroad. The test temperature is 50 ℃, and a small amount of copper salt copper chloride is added to the salt solution to strongly induce corrosion. Its corrosion rate is about 8 times that of NSS test.

4. Alternating salt spray test

It is a comprehensive salt spray test, which is actually a neutral salt spray test plus a constant damp heat test. It is mainly used for cavity type complete machine products. Through the penetration of the humid environment, salt spray corrosion occurs not only on the surface of the product, but also inside the product. It is to alternately convert the product under salt fog and humid and hot environmental conditions, and then check whether the electrical and mechanical properties of the whole product have changed.

Specific procedures for salt spray test:

1. Prepare the salt solution according to the test conditions, place the tested sample according to the sample placement requirements, turn on the power switch of the salt spray box, and the box and the pressure saturation barrel enter the heating stage;

2. After the temperature meets the temperature range required by the test conditions, check whether the spray pressure is maintained at 1kgf;

3. Set the timer according to the requirements of continuous atomization time and turn on the switch of the timer. After the set spray time is met, the spray will be stopped automatically;

4. After the test, first turn off the spray switch, and then turn on the demist switch for demisting for about 20 minutes;

5. After the salt mist in the box is removed, turn off all switches of the equipment, and then open the box door to take out the sample;

6. During the test, it is forbidden to open the box door halfway without special requirements;

7. In the spray state, it is strictly forbidden to remove fog at the same time, because the reverse airflow may damage the equipment;

8. When the salt mist gas in the box is not cleaned, it is forbidden to open the box door to prevent corrosion of other equipment around the box due to the leakage of salt mist gas;

9. After the spray test, the test piece is not allowed to stay in the box for more than 30 minutes, so as not to affect the test results due to the long stay time.

Application field of salt spray test:

1. Road traffic: electronic and electrical equipment of road vehicles, equipment and devices of rail transit rolling stock, auto parts, etc;

2. Computers: computers, display screens, mainframe, computer components, medical equipment and other precision instruments;

3. Electronic communication: mobile phones, RF devices, electronic communication components, PCBs, PCBAs, etc;

4. Electrical appliances: household appliances, lamps, transformers and other household appliances and electrical equipment, instruments and meters, medical devices;

5. Others: electroplating, coating, packaging, transportation equipment, etc.

The above is the salt spray test related content compiled by the core detection team. I hope it will be helpful to you. Shenzhen Chuangxin Online Testing Technology Co., Ltd. is a well-known professional testing institution for electronic components in China, with 3 standardized laboratories covering an area of more than 1000 square meters. The scope of testing services covers: electronic component testing and verification, IC authenticity identification, product design and material selection, failure analysis, function testing, factory incoming material inspection, component X-ray testing, taping and other test items.