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ICS English price group 13 www. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member.
A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by January , and conflicting national standards shall be withdrawn at the latest by January Therefore, the test results should not be regarded as a direct guide to the corrosion resistance of the tested metallic materials, in all environments where these materials may be used.
Also, the performance of different materials, during the test should not be taken as a direct guide to the corrosion resistance of these materials in service. Nevertheless, the method described gives a means of checking that the comparative quality of a metallic material, with or without corrosion protection, is maintained.
Salt spray tests are generally suitable as corrosion protection tests for rapid analysis for discontinuities, pores and damage in organic and inorganic coatings. In addition, for quality control purposes, comparison can be made between specimens coated with the same coating. As comparative tests, however, salt spray tests are only suitable if the coatings are sufficiently similar in nature. It is often not possible to use results gained from salt spray testing as a comparative guide to the long-term behaviour of different coating systems, as the corrosion stress during these tests differs significantly from the corrosion stresses encountered in practice.
It also describes the method employed to evaluate the corrosivity of the test-cabinet environment. It does not specify the dimensions of test specimens, the exposure period to be used for a particular product, or the interpretation of results.
Such details are provided in the appropriate product specifications. The salt spray tests are particularly useful for detecting discontinuities, such as pores and other defects in certain metallic, organic, anodic oxide and conversion coatings.
The neutral salt spray test applies to:? It has also been found suitable for testing anodic coatings on aluminum. The salt spray methods are all suitable for checking that the comparative quality of a metallic material, with or without corrosion protection, is maintained. They are not intended to be used for comparative testing, to rank different materials relative to each other with respect to corrosion resistance.
For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document including any amendments applies. ISO , Paints and varnishes — Standard panels for testing ISO —1 , Paints and varnishes — Determination of film thickness ISO , Cold-reduced carbon steel sheet of commercial and drawing qualities ISO — 2 , Corrosion of metals and alloys — Removal of corrosion products from corrosion test specimens ISO — 3 , Paints and varnishes — Guidelines for the introduction of scribe marks through coatings on metallic panels for corrosion testing 3 Test solutions 3.
Check the pH using electrometric measurement or in routine checks, with a short-range pH paper, which can be read in increments or 0,3 pH units or less. Make any necessary correction by adding hydrochloric acid, sodium hydroxide or sodium bicarbonate solution of analytical grade. Revision of ISO 2 To be published. Revision of ISO 3 To be published. If the pH of the solution initially prepared is 3,0 to 3,1, the pH of the sprayed solution is likely to be within the specified limits.
Make any necessary correction by adding glacial acetic acid or sodium hydroxide of analytical grade. Adjust the pH using the procedures described in 3. For large-capacity cabinets, it is necessary to ensure that the conditions of homogeneity and distribution of the spray are met. The upper parts of the cabinet shall be designed so that drops of sprayed solution formed on its surface do not fall on the specimens being tested.
The size and shape of the cabinet shall be such that the collection rate of solution in the cabinet is within the limits specified in Table 2, measured as specified in 8. It is preferred that the apparatus has a means to properly treat the fog after the test, prior to releasing it from the building for environmental conservation, and also to drain water prior to discharging it to the drainage system.
The temperature shall be measured at least mm from the walls. The compressed air supplied to the atomizers shall be passed through a filter to remove all traces of oil or solid matter, and the atomizing pressure shall be at an overpressure of 70 kPa 4 to kPa. The appropriate temperature depends on the pressure used and on the type of atomizer nozzle and shall be adjusted so that the rate of collection of spray in the cabinet, and the concentration of the collected spray, are kept within the specified limits see 8.
In Table 1, guiding values for the hot water temperature in the saturation tower at different pressures are given. The level of the water shall be maintained automatically to ensure adequate humidification. Baffles may be used to prevent direct impact of spray on the test specimens, and the use of adjustable baffles is helpful in obtaining uniform distribution of the spray within the cabinet. For this purpose, a dispersion tower equipped with an atomizer may also be helpful.
The level of the salt solution in the salt reservoir shall be maintained automatically to ensure uniform spray delivery throughout the test. Suitable funnels have a diameter of mm, which corresponds to a collecting area of approximately 80 cm2. The collecting devices shall be placed in the zone of the cabinet where the test specimens are placed, one close to an inlet of spray and one remote from an inlet.
They shall be placed so that only mist, and not liquid falling from specimens or from parts of the cabinet, is collected. However, in this circumstance, the equipment shall be thoroughly cleaned, and then checked by the method described in Clause 5; particularly ensuring that the pH of the collected solution is correct throughout the entire spraying period. After this procedure, the specimens to be tested are placed in the cabinet. NOTE During permanent operation, a reasonable time period between two checks of the corrosivity of the apparatus is generally considered to be 3 months.
To determine the corrosivity of the tests, reference-metal specimens of steel shall be used. As a complement to reference-metal specimens made of steel, high-purity zinc reference-metal specimens may also be exposed in the tests, to determine the corrosivity against this metal as described in Annex B. Cut these reference specimens from cold-rolled plates or strips. Clean the reference specimens carefully, immediately before testing. Besides the specification given in 6.
Carry out the cleaning in a vessel full of solvent. After cleaning, rinse the reference specimens with fresh solvent and then dry them. Protect one face of the reference specimens with a removable coating, for example an adhesive plastic film. The edges of the reference test specimens may be protected by the adhesive tape as well. The support for the reference specimens shall be made of, or coated with, inert materials such as plastics.
The lower edge of the reference specimens shall be level with the top of the salt spray collector. The test duration shall be 48 h.
Test specimens of types different from the reference specimens shall not be placed in the test cabinet during the verification procedure. Remove the corrosion products by mechanical and chemical cleaning as described in ISO After each stripping, thoroughly clean the reference specimens at ambient temperature with water, then with ethanol, followed by drying. Weigh the reference specimens to the nearest 1 mg. Divide the determined mass loss by the area of the exposed surface area of the reference specimen, to assess the metal mass loss per square metre of the reference specimen.
It is recommended to use freshly prepared solution during every procedure for removal of corrosion products. Carry out 6 See Bibliography, Reference .
After cleaning, rinse the reference specimens with fresh solvent, and then dry them. The edges of the reference test specimens may be protected by the adhesive tape as well 5. The test duration shall be 24 h. After cleaning, rinse the reference specimens with fresh solvent, then dry them.
The test duration is 24 h. Test specimens of types different from the reference specimens shall not be placed in the test chamber during the verification procedure. When not so specified, these details shall be mutually agreed between the interested parties. Annex C describes how test panels with organic coatings are to be prepared for testing. Annex D gives supplementary information needed for testing of test panels with organic coatings. The cleaning method employed shall depend on the nature of the material, its surface and the contaminants, and shall not include the use of any abrasives or solvents which may attack the surface of the specimens.
Care shall be taken that specimens are not recontaminated after cleaning by careless handling. Unless otherwise specified, the cut edges shall be adequately protected by coating them with a suitable material, stable under the conditions of the test, such as paint, wax or adhesive tape. In the case of irregular surfaces, for example entire components, these limits shall be adhered to as closely as possible.
The specimens may be placed at different levels within the cabinet, as long as the solution does not drip from specimens or their supports at one level onto other specimens placed below. However, for a new examination or for tests with a total duration exceeding 96 h, location permutation of specimens is permitted If it is necessary to suspend specimens, the material used shall not be metallic but shall be synthetic fibre, cotton thread or other inert insulating material.
After it has been confirmed that the test conditions are within a specified range, fill the test chamber with test specimens and start the test. The average rate of collection of solution in each device shall be measured over a minimum period of 24 h of continuous spraying. When not specified, this period shall be agreed upon by the interested parties.
Recommended periods of exposure are 2 h, 6 h, 24 h, 48 h, 96 h, h, h, h, h and 1 h. The cabinet shall be opened only for brief visual inspections of the test specimens in position and for replenishing the salt solution in the reservoir, if such replenishment cannot be carried out from outside the cabinet. For this reason, this type of specimen should not be tested with other specimens requiring tests of predetermined durations. Before they are examined, carefully remove the residues of spray solution from their surfaces.
How to treat specimens after testing should, in line with good engineering practice, be included in the test specification.
NOTE It is good engineering practice to define the appropriate criteria in the specification for a coating or a product to be tested. Report the result obtained for each specimen tested and, when appropriate, the average result for a group of replicate test specimens. Photographic records of the tested specimens may, if required, accompany the report.
This information may vary according to the purpose of the test and to the directions prescribed for it, but a general list of the details likely to be required is as follows: a a reference to this International Standard; b type and purity of salt and water used; c the description of the material or product tested; d dimensions and shape of the test specimen, and the nature and area of the surface tested; 15 Normen-Download-Beuth-Bayerische Motoren Werke AG-KdNr.
Before testing, the reference specimens shall be cleaned carefully with a hydrocarbon solvent, in order to remove all evidence of dirt, oil, or other foreign matter capable of influencing the result from the corrosion-rate determination.
After drying, the reference specimens shall be weighed to the nearest 1 mg. The support for the reference specimens shall be made of, or coated with, inert materials such as plastic, and be placed at the same level as the test specimens.
Then remove the corrosion products by repetitive cleaning as described in ISO
BS EN ISO 17872:2019
It is intended as a guideline only, being based on the results of a collaborative trial with no subsequent corrosion testing having been carried out to determine the suitability of the introduced scribe marks for such tests. This document covers the scribing of metallic panels or test pieces chemically treated or not made from:. Check out our FAQs. Buy this standard. This document covers the scribing of metallic panels or test pieces chemically treated or not made from: — steel; — galvanized steel; — aluminium alloys; — magnesium alloys. It does not cover the scribing of electroplated metal or clad aluminium panels. CHF Buy.
ISO describes methods of scribing coated steel or test-pieces for corrosion tests, where the coating system is applied at dry film thicknesses of less than micrometres. It is intended as a guideline only, being based on the results of a collaborative trial with no subsequent corrosion testing having been carried out to determine the suitability of the introduced scribe marks for such tests. Check out our FAQs. This standard has been revised by ISO ISO covers the scribing of metallic panels or test pieces made from steel, chemically treated steel, aluminium or aluminium alloy, and chemically treated aluminium. It does not cover the scribing of galvanized or electroplated metal or clad aluminium panels.
It is intended as a guideline only, being based on the results of a collaborative trial with no subsequent corrosion testing having been carried out to determine the suitability of the introduced scribe marks for such tests. This document covers the scribing of metallic panels or test pieces chemically treated or not made from:. It does not cover the scribing of electroplated metal or clad aluminium panels. Multi-user access to over 3, medical device standards, regulations, expert commentaries and other documents.