GB/T 2423.18-2000
Environmental testing-Part 2: Tests-Test Kb:Salt mist,cyclic(sodium chloride solution)

Be replaced

Standard No.

GB/T 2423.18-2000

Language

Chinese

Release Date

2000

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Replace By

GB/T 2423.18-2012

Lastest

GB/T 2423.18-2021

Scope

This test is applicable to components or equipment intended to withstand a saline atmosphere, the degree of resistance depends on the severity level selected. Salt can degrade the performance of metallic and/or non-metallic parts. The mechanism of salt corrosion of metal materials is electrochemical corrosion, while the degradation of non-metallic materials is caused by the complex chemical reaction between salt and materials. The corrosion rate depends largely on the amount of oxygen-containing salt solution supplied to the surface of the test sample, the temperature of the sample and the temperature and humidity of the environment. In addition to showing the corrosion effect, this test can also show the degree of deterioration of some non-metallic materials due to the absorption of salt. In the following test methods, the saline solution is sprayed for a time sufficient to fully wet the entire specimen. Since this wetting is repeated after storage under hot and humid conditions (severity levels (1) and (2)), in some cases supplemented with storage under the standard atmosphere used for the test (severity levels (3) to (6) ), so the effects of the natural environment can be more effectively reproduced. Severity classes (1) and (2) are suitable for testing products that are used in a marine environment or in offshore areas. Severity level (l) is suitable for testing products that are exposed to this environment for a large part of their service life (eg marine radar, deck equipment). Severity rating (2) is suitable for testing products that may be regularly exposed to the marine environment, but would normally be protected by enclosures (such as marine equipment typically used on the bridge of a ship or in a control room). Additionally severity levels (l) and (2) are often used as general corrosion tests in component quality assurance programs. Severity classes (3) to (6) apply to products that are normally used in frequent alternation between saline and dry atmospheres, such as automobiles and their parts. Therefore, severity levels (3) to (6) involve an additional storage under the standard atmospheric conditions used for the test compared to severity levels (1) and (2). In fact, during periods of interruption to work, for example on weekends, a dry atmosphere may occur. This dry stage included in severity levels (3) to (6) results in corrosion mechanisms that may be quite different from those under constant heat and humidity conditions. The test method is accelerated compared to the conditions of use. However, it is not possible to establish a comprehensive acceleration factor for various types of samples with this test method (see IEC 355).

GB/T 2423.18-2000 history

• 2021 GB/T 2423.18-2021 Environmental testing—Part 2: Test methods—Test Kb:Salt mist, cyclic（sodium chloride solution）
• 2012 GB/T 2423.18-2012 Environmental testing.Part 2:Test methods.Test Kb:Salt mist,cyclic(sodium chloride solution)
• 2000 GB/T 2423.18-2000 Environmental testing-Part 2: Tests-Test Kb:Salt mist,cyclic(sodium chloride solution)

GB/T 2423.18-2000 -All Parts