GB/T 2423.18-2000: Environmental testing for electric and electronic products - Part 2: Tests - Test Kb: Salt spray, alternating (sodium chloride solution)

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Scope

This test is intended for application to components or equipment designed to
withstand a salt-laden atmosphere, depending on the chosen severity. Salt
can degrade the performance of parts manufactured using metallic and/or
non-metallic materials.
The mechanism of salt corrosion on metallic materials is electrochemical,
whereas the degradation effects experienced on non-metallic materials are
caused by complex chemical reactions of the salts with the materials involved.
The rate at which corrosive action takes place is dependent, to a large extent,
on the supply of oxygenated salt solution to the surface of the test specimen,
the temperature of the specimen and the temperature and humidity of the
environment.
Apart from the corrosive effects, this test may be used to indicate
deterioration of some non-metallic materials by assimilation of salts. In the
following test methods, the period of spraying with the relevant salt solution is
sufficient to wet the specimen thoroughly. Because this wetting is repeated
after intervals of storage under humid conditions (severities (1) and (2)) and -
in some cases severities ((3) to (6)) - supplemented by storage under a
standard atmosphere for testing, it goes some way to reproducing the effects
of natural environments.
Severities (1) and (2) are intended to be used for testing products which are
used in a marine environment, or in close proximity to the sea. Severity (1)
should be used to test products which are exposed to the environment for
much of their operational life (e.g. ship radar, deck equipment). Severity (2)
should be used to test products which may be exposed to the marine
environment from time to time but will normally be protected by an enclosure
(e.g. navigational equipment which will normally be used on the bridge or in a
control room).
Additionally, severities (1) and (2) are commonly used as a general corrosion
test in component quality assurance procedures.
Severities (3) to (6) are intended for products where, under normal use, there
is a frequent change between salt-laden and dry atmosphere, e.g.

Basic Data

Standard ID	GB/T 2423.18-2000 (GB/T2423.18-2000)
Description (Translated English)	Environmental testing for electric and electronic products Part II: Tests - Test Kb: Salt spray, alternating (sodium chloride solution)
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	K04
Classification of International Standard	19.040
Word Count Estimation	7,762
Date of Issue	2000-01-03
Date of Implementation	2000-08-01
Older Standard (superseded by this standard)	GB/T 2423.18-1985
Quoted Standard	GB/T 2421-1999; GB/T 2423.3-1993; GB/T 2424.10-1993
Adopted Standard	IEC 60068-2-52-1996, IDT
Regulation (derived from)	National Standards Bulletin No. 28 of 2012
Issuing agency(ies)	State Quality and Technical Supervision
Summary	This standard applies to a predetermined tolerance of salinity atmospheric components or equipment, the tolerance level with selected severities may be. Salt can reduce the metal parts and (or) non-metallic parts of the performance.