AS 60068.2.52:2003

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Environmental testing – Tests – Test Kb: Salt mist, cyclic (sodium chloride solution)

Published By	Publication Date	Number of Pages
AS	2003-06-19	16

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Categories: 19.040 - Environmental testing, 29.020 - Electrical engineering in general, AS

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Description

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. automobiles and their parts.
Severities (3) to (6), compared to severities (1) and (2), therefore include an additional
storage under a standard atmosphere for testing.
The period of dry atmosphere may happen, in practice, during breaks of operation, e.g. during
the weekend. This inclusion of such a dry period in severities (3) to (6) leads to corrosion
mechanism which can be quite different from those under constant humid conditions.
The test is accelerated compared with most service conditions. However, it is not possible to
establish an overall acceleration factor for all kinds of specimens (see IEC 60355).

Additional information

Published Code	AS
Published By	Australia Standards
Publication Date	2003-06-19
Pages Count	16
Language	English
Edition	1
File Size	194.6 KB
ISBN	0733752802
ICS Codes	19.040 - Environmental testing 29.020 - Electrical engineering in general

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AS 60068.2.52:2003

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