1、May 2013 Translation by DIN-Sprachendienst.English price group 6No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 25.
2、220.99; 77.060!%(Dq“2053378www.din.deDDIN 50018Testing in a saturated atmosphere in the presence of sulfur dioxide,English translation of DIN 50018:2013-05Prfung im Kondenswasser-Wechselklima mit schwefeldioxidhaltiger Atmosphre,Englische bersetzung von DIN 50018:2013-05Essai dans une atmosphre satu
3、re en prsence de dioxyde de soufre,Traduction anglaise de DIN 50018:2013-05SupersedesDIN 50018:1997-06www.beuth.deDocument comprises 7 pagesIn case of doubt, the German-language original shall be considered authoritative.10.13 DIN 50018:2013-05 2 A comma is used as the decimal marker. Contents Page
4、Foreword . 3 1 Scope . 4 2 Normative references . 4 3 Terms and definitions 5 4 Apparatus and material 5 5 Designation . 5 6 Test specimens . 5 7 Arrangement of test specimens 5 8 Procedure 5 8.1 Test conditions and procedure . 5 8.2 Test duration . 5 9 Performance checks . 6 9.1 General . 6 9.2 Tes
5、t specimens used for performance checks . 6 9.3 Preparation of test specimens 6 9.4 Performance check . 7 9.5 Removal of corrosion products 7 9.6 Weighing of test specimens 7 9.7 Evaluation of results 7 10 Test report . 7 DIN 50018:2013-05 3 Foreword This document has been prepared by Working Commit
6、tee NA 062-01-71 AA Korrosion und Korrosionsschutz of the Normenausschuss Materialprfung (NMP) (Materials Testing Standards Committee). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. DIN shall not be held responsible for identify
7、ing any or all such patent rights. Amendments This standard differs from DIN 50018:1997-06 as follows: a) designations of test atmospheres have been revised to comply with DIN EN ISO 6270-2; b) procedures of performance checks on the apparatus have been revised to ensure compliance with the requirem
8、ents on dummy specimens according to DIN EN ISO 6988; c) the standard has been editorially revised. Previous editions DIN 50018: 1963-12, 1978-05, 1988-06, 1997-06 DIN 50018:2013-05 4 1 Scope This standard specifies the general conditions and procedures for the testing of test specimens in condensat
9、ion atmospheres in the presence of sulfur oxide and specifically for sulfur dioxide concentrations that are not included in DIN EN ISO 6988:1997-03 and which are required to be complied with to ensure that the results of tests carried out in different laboratories are reproducible. If a particular c
10、oncentration has not been specified, testing is to comply with DIN 50018 AHT 1,0 S. It is advisable to test only same-type anti-corrosion systems at the same time in any one apparatus, as interactions between test specimens of different systems cannot be excluded. If more than one anti-corrosion sys
11、tem is tested on more than one test material, it needs to be taken into account that the effect of sulfur dioxide on the test specimens might vary. The shape and preparation of test specimens, the duration of the test and the assessment of the test results are not covered in this standard. For infor
12、mation regarding these, the relevant standards and regulations shall be consulted or shall be agreed on a case-to-case basis. For the purpose of these tests, the specifications of DIN 50905-1 to DIN 50905-3 in particular shall be complied with. Further information is given in the Introduction to DIN
13、 EN ISO 6988:1997-03. The tests described in this standard serve to assess the effectiveness of anti-corrosion systems and to quickly diagnose corrosion defects. The tests described here are assigned to the category accelerated corrosion tests as in DIN EN ISO 8044. Unless the anti-corrosion systems
14、 applied are similar to one another, it may be difficult to compare their effectiveness under service conditions. This is due to the fact that corrosive test conditions may differ considerably from those occurring in service, thus inducing corrosion to take different routes and to employ different m
15、echanisms. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (includin
16、g any amendments) applies. DIN 50900-2, Corrosion of metals Terms Part 2: Electrochemical terms DIN 50905-1, Corrosion of metals Corrosion testing Part 1: General guidance DIN 50905-2, Corrosion of metals Corrosion testing Corrosion characteristics under uniform corrosion attack DIN 50905-3, Corrosi
17、on of metals Corrosion testing Corrosion characteristics under nonuniform and localized corrosion attack without mechanical stress DIN EN 10130, Cold rolled low carbon steel flat products for cold forming Technical delivery conditions DIN EN ISO 6988:1997-03, Metallic and other non-organic coatings
18、Sulfur dioxide test with general condensation of moisture (ISO 6988:1985) DIN EN ISO 8044, Corrosion of metals and alloys Basic terms and definitions ISO 8407, Corrosion of metals and alloys Removal of corrosion products from corrosion test specimens DIN 50018:2013-05 5 3 Terms and definitions For t
19、he purposes of this document, the terms and definitions given in DIN 50900-2 and DIN EN ISO 8044 apply. 4 Apparatus and material DIN EN ISO 6988:1997-03, Clause 3 shall apply. 5 Designation The designations for both tests (see Table 1) shall read: Test DIN 50018 AHT 1,0 S, Test DIN 50018 AHT 2,0 S.
20、6 Test specimens DIN EN ISO 6988:1997-03, Clause 4 shall apply. 7 Arrangement of test specimens DIN EN ISO 6988:1997-03, Clause 5 shall apply. 8 Procedure 8.1 Test conditions and procedure The test conditions are specified in Table 1, partly deviating from DIN EN ISO 6988:1997-03. Additionally, DIN
21、EN ISO 6988:1997-03, 6.1, 6.2 and 6.4 shall apply for test procedures. NOTE Much of the sulfur dioxide added at the beginning of the first test phase quickly dissolves into the water at the bottom of the test chamber. Thus, the effective sulfur dioxide concentration in the gas chamber is approximate
22、ly only 1/7 of the theoretical concentration. Also, the initial concentration does not remain constant during the first test phase, dropping rapidly at first and then more slowly. The second test phase starts with the switching off of the heating and the opening and/or venting of the test chamber; a
23、fter approximately 1 hour the test conditions given in Table 1 are required to be achieved. 8.2 Test duration Unless the test duration has been specified in specific test standards, tests shall preferably be performed in cycles of 1, 2, 5, 10, 15 or 20. The test may be terminated if a specified degr
24、ee of corrosion has been reached, or if the appearance or function of test specimens has otherwise been impaired to an unacceptable level. If, as usual, several test cycles are carried out, according to DIN EN ISO 6988:1997-03, 6.5.1, the water and sulfur dioxide in the test chamber shall be replace
25、d before the start of each new cycle. DIN 50018:2013-05 6 9 Performance checks 9.1 General In order to ensure the reproducibility and repeatability of test results obtained either with one or several test apparatuses, performance checks shall be carried out. The specifications of 9.2 to 9.7 shall ap
26、ply to a nominal test apparatus with a test chamber capacity of 300 l. 9.2 Test specimens used for performance checks 9.2.1 Five test specimens, each made of DC04B and with a width of 50 mm, a length of 100 mm and a thickness from 0,6 mm up to 1,5 mm, according to DIN EN 10130. 9.2.2 Two dummy speci
27、mens, made of DC04B as in DIN EN 10130, each with a width of 250 mm, a length of 400 mm and a thickness of 1 mm shall be used to reach the required total specimen surface1). 9.3 Preparation of test specimens Before the performance check is carried out, the test specimens and dummy specimens specifie
28、d in 9.2 shall be degreased with white spirit or some other suitable solvent using a soft, lint-free cloth or brush and the test specimens weighed to an accuracy of 1 mg as in 9.2.1. If the test specimens cannot be weighed immediately after degreasing, they are to be kept in a desiccator until weigh
29、ing can be carried out. Table 1 Test conditions Test conditions Theoretical concentration of SO2 volume at the beginning of a test cycle% (volume fraction) 0,33a0,67 Designation Test Test DIN 50018 AHT 1,0 S DIN 50018 AHT 2,0 S Test cycle 1. Test phase h 8 including heating 2. Test phase h 16 includ
30、ing cooling (test chamber opened or vented) Total h 24 Exposure conditions in the test chamber 1. Test phase Temperature C (40 3) Relative humidity % Approximately 100 % (with formation of condensate on the specimen) 2. Test phase Temperature C 18 to 28 Relative humidity % max. 75 Water at bottom of
31、 test chamber 0,67bAHT stands for condensation climate with alternating humidity and air temperature. aGiven an apparatus with a test chamber capacity of 300 l, the theoretical SO2concentration is equivalent to the addition of 1,0 l to 2,0 l of SO2per cycle. bThe concentration is based on a test cha
32、mber capacity of 300 l and equal to a water volume of 2 l. 1) See DIN EN ISO 6988:1997-03, 5.4 DIN 50018:2013-05 7 9.4 Performance check The five test specimens as in 9.2.1 shall be placed vertically in the test chamber. The dummy specimens as in 9.2.2 shall be positioned vertically on either side o
33、f the five test specimens. Five test cycles shall be carried out under the test conditions specified in DIN EN ISO 6988. 9.5 Removal of corrosion products The corrosion products shall be removed from the test specimens by pickling carried out at a temperature of 18 C to 28 C. For this, hydrochloric
34、acid with a density = 1,10 g/ml and inhibited with 3,5 g hexamethylenetetramine per litre can be used (e.g. by making up 500 ml of chemically pure HCI, = 1,19 g/ml, to 1 l with deonized water). Other solutions as specified in ISO 8407 may be used. After removal of the corrosion products the test spe
35、cimens shall be rinsed thoroughly in water, dried and stored in the desiccator at a temperature of 18 C to 28 C until weighing can be carried out. 9.6 Weighing of test specimens The specimens shall be weighed to an accuracy of 1 mg. 9.7 Evaluation of results The loss in mass determined shall be expr
36、essed as a function of the total area exposed to corrosion, in g/m2. The mean value shall be (125 25) g/m2. Individual values shall not deviate from the mean by more than 20 %. 10 Test report The test report shall include, as a minimum: a) a reference to this standard, b) the type and designation of the test specimens, c) the code letters of the test, d) the duration of the test, e) any interruptions during the test, f) the nominal test chamber capacity, g) any deviations from this standard if applicable, h) the date of the test.
