ISO 9022-4:2002

Optics and optical instruments — Environmental test methods — Part 4: Salt mist

This part of ISO 9022 specifies methods for the testing of optical instruments and instruments containing optical components, under equivalent conditions, for their ability to resist salt mist. Exposure to salt mist mainly results in the corrosion of metals; effects may also occur by way of clogging or binding of moving parts. The purpose of testing is to assess as early as possible the ability of the instrument, and particularly of the surfaces and protective coatings of the instrument, to resist the effects of a salt atmosphere. Normally, representative samples or complete small units are used for testing. Complete large instruments or assemblies are only tested as specified in this part of ISO 9022 in exceptional cases.

Optique et instruments d'optique — Méthodes d'essais d'environnement — Partie 4: Brouillard salin

General Information

• Status: Withdrawn
• Publication Date: 20-Oct-2002
• Withdrawal Date: 20-Oct-2002
• ICS: 37.020 - Optical equipment
• Technical Committee: ISO/TC 172/SC 1 - Fundamental standards
• Drafting Committee: ISO/TC 172/SC 1/WG 3 - Environmental test methods
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 29-Oct-2014

Relations

• Revised: ISO 9022-4:2014 - Optics and photonics — Environmental test methods — Part 4: Salt mist
• Effective Date: 03-May-2014
• Revises: ISO 9022-4:1994 - Optics and optical instruments — Environmental test methods — Part 4: Salt mist
• Effective Date: 15-Apr-2008

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 9022-4
Second edition
2002-10-15
Optics and optical instruments —
Environmental test methods —
Part 4:
Salt mist
Optique et instruments d'optique — Méthodes d'essais d'environnement —
Partie 4: Brouillard salin

Reference number
ISO 9022-4:2002(E)
© ISO 2002

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ISO 9022-4:2002(E)
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ISO 9022-4:2002(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bodies). The work of preparing International Standards is normally carried out through ISO technical
committees. Each member body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, governmental and non-governmental, in
liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this part of ISO 9022 may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO9022-4 was prepared by Technical Committee ISO/TC172, Optics and optical
instruments, Subcommittee SC 1, Fundamental standards.
This second edition cancels and replaces the first edition (ISO 9022-4:1994), which has been technically revised.
ISO 9022 consists of the following parts, under the general title Optics and optical instruments — Environmental test
methods:
— Part 1: Definitions, extent of testing
— Part 2: Cold, heat and humidity
— Part 3: Mechanical stress
— Part 4: Salt mist
— Part 5: Combined cold, low air pressure
— Part 6: Dust
— Part 7: Drip, rain
— Part 8: High pressure, low pressure, immersion
— Part 9: Solar radiation
— Part 10: Combined sinusoidal vibration and dry heat or cold
— Part 11: Mould growth
— Part 12: Contamination
— Part 13: Combined shock, bump or free fall and dry heat or cold
— Part 14: Dew, hoarfrost, ice
— Part 15: Combined digitally controlled broad-band random vibration and dry heat or cold
— Part 16: Combined bounce or steady-state acceleration and dry heat or cold
— Part 17: Combined contamination, solar radiation
— Part 18: Combined damp heat and low internal pressure
— Part 19: Temperature cycles combined with sinusoidal or random vibration
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ISO 9022-4:2002(E)
— Part 20: Humid atmosphere containing sulfur dioxide or hydrogen sulfide
— Part 21: Combined low pressure and ambient temperature or dry heat
Annex A of this part of ISO 9022 is for information only.
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ISO 9022-4:2002(E)
Introduction
Optical instruments are affected during their use by a number of different environmental parameters which they are
required to resist without significant reduction in performance.
The type and severity of these parameters depend on the conditions of use of the instrument (for example, in the
laboratory or workshop) and on its geographical location. The environmental effects on optical instrument
performance in the tropics and subtropics are totally different from those found when they are used in the arctic
regions. Individual parameters cause a variety of different and overlapping effects on instrument performance.
The manufacturer attempts to ensure, and the user naturally expects, that instruments will resist the likely rigours of
their environment throughout their life. This expectation can be assessed by exposure of the instrument to a range of
simulated environmental parameters under controlled laboratory conditions. The severity of these conditions is often
increased to obtain meaningful results in a relatively short period of time.
In order to allow assessment and comparison of the response of optical instruments to appropriate environmental
conditions, ISO 9022 contains details of a number of laboratory tests which reliably simulate a variety of different
environments. The tests are based largely on IEC standards, modified where necessary to take into account features
special to optical instruments.
It should be noted that, as a result of continuous progress in all fields, optical instruments are no longer only
precision-engineered optical products, but, depending on their range of application, also contain additional
assemblies from other fields. For this reason, the principal function of the instrument must be assessed to determine
which International Standard should be used for testing. If the optical function is of primary importance, then
ISO 9022 is applicable, but if other functions take precedence then the appropriate International Standard in the field
concerned should be applied. Cases may arise where application of both ISO9022 and other appropriate
International Standards will be necessary.
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INTERNATIONAL STANDARD ISO 9022-4:2002(E)
Optics and optical instruments — Environmental test methods —
Part 4:
Salt mist
1 Scope
This part of ISO 9022 specifies methods for the testing of optical instruments and instruments containing optical
components, under equivalent conditions, for their ability to resist salt mist.
Exposure to salt mist mainly results in the corrosion of metals; effects may also occur by way of clogging or binding
of moving parts.
The purpose of testing is to assess as early as possible the ability of the instrument, and particularly of the surfaces
and protective coatings of the instrument, to resist the effects of a salt atmosphere.
Normally, representative samples or complete small units are used for testing. Complete large instruments or
assemblies are only tested as specified in this part of ISO 9022 in exceptional cases.
2 Normative reference
The following normative document contains provisions which, through reference in this text, constitute provisions of
this part of ISO 9022. For dated references, subsequent amendments to, or revisions of, this publication do not apply.
However, parties to agreements based on this part of ISO 9022 are encouraged to investigate the possibility of
applying the most recent edition of the normative document indicated below. For undated references, the latest
edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid
International Standards.
ISO 9022-1:1994, Optics and optical instruments — Environmental test methods — Part 1: Definitions, extent of
testing
3 General information and test conditions
3.1 Limitations of testing
3.1.1 General
The aim of salt mist testing is unlikely to be achieved unless the deficiencies and limitations of such testing as
detailed in 3.1.2 and 3.1.3 are fully recognized.
3.1.2 Suitability
Salt mist testing is considered suitable for:
a) the assessment of the resistance of optical and other functional layers;
b) assessing the anticorrosion effect of metallic and non-metallic coatings;
c) early detection of the unacceptability of material combinations.
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ISO 9022-4:2002(E)
3.1.3 Unsuitability
Salt mist tests as specified in this part of ISO 9022 shall not be performed in the following cases:
a) as a general corrosion test, as no verified data are available showing that there is a direct relationship between
salt mist corrosion and corrosion caused by other attacking corrosive media or environments;
b) on separate components or assemblies that are used only in assembled or any other configurations protected
from corrosion;
c) as a true duplication of natural marine environment.
NOTE Generally the salt mist test is unreliable for comparing the corrosion resistance of different materials, or the anticorrosive
effect of coatings, exposed to varying climatic conditions, nor is it suitable for predicting the service life of such materials or
coatings. Some idea of the service life of different specimens of identical or closely related metals, or of different specimens of
identical or comparable protective coating combinations, can be gained by the salt mist test provided that, by correlating field
service test data with laboratory tests, such relationships can be demonstrated as exist in the case of aluminium alloys. Such
correlation tests are essential if data are required on the accelerating effect (if any) of laboratory testing as compared to
performance under natural service conditions.
3.2 Specimens
Specimens shall be made of the basic materials used for the instrument under test; coatings (finishing coatings,
protective coatings, thin films on optical parts), if any, shall be of the same structure as those used for the instrument
components and surfaces to be assessed.
Specimens for testing metallic and non-metallic coatings shall preferably be metal sheets (sample sheets) as shown
in Figure 1. The coating under test shall completely cover the sample sheet, especially the outer edges and edges of
holes. Where this is not feasible, exposed metal edges shall be protected by a means that does not affect the coating
under test. Marking of the sample sheets shall not damage the coating to be tested (e.g. punch-marking shall be
carried out prior to applying the coating).
Dimensions in millimetres
t = thickness of sample sheet
a
Marking area (on the back)
Figure 1 — Sample sheet
Where the instruments or instrument components to be assessed are made of cast material, the use of specimens
originating from the same batch shall be agreed upon and documented in the test report.
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ISO 9022-4:2002(E)
In the test of optical and other functional layers, specimens shall be used as test-pieces which consist of the same
basic materials as the original components.
Complete large instruments and assemblies, or separate components that are used in assembled configurations
only, shall not be tested in accordance with this part of ISO 9022 unless as an exception. If necessary, essential
areas of such specimens and of specimens other than sample sheets (e.g. electrically insulated components, open
assemblies) may be used for assessment by agreement between the parties concerned.
3.3 Apparatus (see Figure 2)
The test apparatus essentially comprises the components described below. All parts of the test apparatus that come
into contact with the salt mist or the test solution shall be made of a material that will not affect the corrosiveness of
the test solution or the salt mist.
3.3.1 Test chamber, used for salt mist tests including a heated exposure chamber providing pressure balance and
◦ ◦
measuring/controlling means to adjust and maintain the test temperature to 35 C± 2 C within the closed chamber.
400 l
The test chamber shall have a volume of not less than ; it shall be constructed so as to prevent condensate
dripping from overhead, and from the sidewalls, onto the specimens. The dripping of condensate from overhead can
◦
30
be avoided by inclining the exposure chamber at least to the horizontal.
Test solution once atomized shall not return into the salt solution reservoir.
The exposure zone is that part of the test chamber which is not covered by the cone-shaped spray, and where
uniform distribution of the mist can be demonstrated in accordance with 3.5.2.
3.3.2 Atomizing nozzles, made of polymethylmethacrylate or polyvinylchloride and having an orifice of 1mm
◦
diameter; their dispersion angle is approximately 30 and they are operated at a positive pressure of between 70 kPa
and 140 kPa, and a suction level of 200 mm to 500 mm. Salt mist has proved to be best produced by self-priming
compressed-air nozzles without a regulating or quick-cleaning needle. It is useful to provide a means for measuring
and controlling the flow of fluid (see Figure 2), serving to adjust and control the a
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