GB/T 2423.18-2012
Environmental testing.Part 2:Test methods.Test Kb:Salt mist,cyclic(sodium chloride solution) (English Version)

Standard No.

GB/T 2423.18-2012

Language

Chinese, Available in English version

Release Date

2012

Published By

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

Status

Be replaced 2021-12

Replace By

GB/T 2423.18-2021

Latest

GB/T 2423.18-2021

Replace

GB/T 2423.18-2000

Scope

This test is applicable to components or equipment intended to withstand saline atmospheres, and the corresponding severity level is selected according to the degree of tolerance during the test. Salts can degrade the performance of metallic and/or non-metallic materials. The mechanism of salt corrosion of metallic materials is electrochemical corrosion, while the deterioration of non-metallic materials is caused by the comprehensive chemical reaction of salt and materials. The corrosion rate depends largely on the amount of oxygen-containing salt solution supplied to the surface of the 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 time of spraying salt solution is sufficient to fully wet the entire sample. Since this wetting is repeated after storage under hot and humid conditions (severity levels (1) and (2)), in some cases supplemented by storage under the test standard atmosphere (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 rating (1) is suitable for testing products that are exposed to this environment for most of their service life (e.g. 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 (1) 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) contain an additional storage under test standard atmospheric conditions compared to severity levels (1) and (2). In fact, dry atmospheres may occur during periods of interruption to work, for example on weekends. This drying 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, this test method cannot establish a comprehensive acceleration factor for various types of samples (see IEC 60355:1971).

GB/T 2423.18-2012 Referenced Document

• GB/T 2421.1-2008 Environmental testing for electric and electronic products.General and guidance
• GB/T 2423.3-2006 Environmental testing for electric and electronic products-Part 2:Tesing method-Test Cab：Damp heat,steady state
• IEC 60355:1971 Appraisal of the Problems of Accelerated Testing for Atmospheric Corrosion (Edition 1.0)

GB/T 2423.18-2012 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 2423.18-2012 -All Parts