1、 Reference numberISO 11997-1:2005(E)ISO 2005INTERNATIONAL STANDARD ISO11997-1Second edition2005-03-15Paints and varnishes Determination of resistance to cyclic corrosion conditions Part 1: Wet (salt fog)/dry/humidity Peintures et vernis Dtermination de la rsistance aux conditions de corrosion cycliq
2、ue Partie 1: Brouillard salin/scheresse/humidit Copyright International Organization for Standardization Reproduced by IHS under license with ISO Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ISO 11997-1:2005(E) PDF disclaimer This PDF file may contain embedded t
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7、stale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2005 All rights reservedCopyright International Organization for Standardization Reproduced by IHS under license with ISO Not for ResaleNo reproduction or n
8、etworking permitted without license from IHS-,-,-ISO 11997-1:2005(E) ISO 2005 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope 1 2 Normative references . 1 3 Principle . 2 4 Required supplementary information . 2 5 Salt fog test solution. 2 6 Apparatus. 3 7 Sampling 4 8 Test p
9、anels 4 9 Method of exposure of test panels 5 10 Operating conditions 5 11 Procedure. 5 12 Examination of test panels. 6 13 Precision 6 14 Test report 6 Annex A (normative) Required supplementary information 8 Annex B (informative) Factors to be considered in the design and construction of salt spra
10、y cabinets 9 Annex C (normative) Cycle A 10 Annex D (normative) Cycle B 11 Annex E (normative) Cycle C 12 Annex F (normative) Cycle D. 13 Copyright International Organization for Standardization Reproduced by IHS under license with ISO Not for ResaleNo reproduction or networking permitted without li
11、cense from IHS-,-,-ISO 11997-1:2005(E) iv ISO 2005 All rights reservedForeword 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 techni
12、cal 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 w
13、ith 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 2. The main task of technical committees is to prepare International Standards. Draft Int
14、ernational 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 document m
15、ay be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 11997-1 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General test methods for paints and varnishes. This second edition cancels and repl
16、aces the first edition (ISO 11997-1:1998) (including Technical Corrigendum ISO 11997-1:1998/Cor.1:1998), in which cycle A has been revised and cycle D has been added to correlate with ISO 14993:2001, Corrosion of metals and alloys Accelerated testing involving cyclic exposure to salt mist, “dry” and
17、 “wet” conditions. ISO 11997 consists of the following parts, under the general title Paints and varnishes Determination of resistance to cyclic corrosion conditions: Part 1: Wet (salt fog)/dry/humidity Part 2: Wet (salt fog)/dry/humidity/UV light Copyright International Organization for Standardiza
18、tion Reproduced by IHS under license with ISO Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ISO 11997-1:2005(E) ISO 2005 All rights reserved vIntroduction Coatings of paints, varnishes and similar materials are exposed to one of four cycles of wet and dry conditi
19、ons using specified salt solutions in a cabinet in order to simulate, in the laboratory, processes occurring in aggressive outdoor conditions, such as marine environments. Generally, correlation between such outdoor weathering and laboratory testing cannot be expected because of the large number of
20、factors influencing the breakdown process. Correlation can only be expected if the effect on the coating of important parameters (e.g. the nature of the pollutant, the spectral distribution of the incident irradiance in the relevant photochemical region, the temperature of the specimen, the type and
21、 cycle of wetting and relative humidity) is known. In contrast to outdoor weathering, laboratory testing in a cabinet is performed with a reduced number of variables which can be controlled, and therefore the effects are more reproducible. The method described may also give a means of checking that
22、the quality of a paint or paint system is being maintained. The method has been found to be useful in comparing the cyclic salt spray resistance of different coatings. It is most useful in providing relevant ratings for a series of coated panels exhibiting significant differences in cyclic salt spra
23、y resistance. The test cycles included in this part of ISO 11997 have been used successfully, with documented evidence, in the industry for the assessment of performance. The cycles can be summarized as follows. Cycle A (see Annex C): This cycle is specified in Japanese Automobile Standards JASO M 6
24、09-91, Corrosion test method for automotive materials, and JASO M610-92, Cosmetic corrosion test method for automotive parts. Cycle B (see Annex D): This is based on the VDA 621-415 cycle and is widely used in Europe. It has also been shown to give good correlation with natural weathering for thermo
25、setting paints in vehicle corrosion. Cycle C (see Annex E): This cycle was developed in the UK for use with water-soluble and latex paint systems, and has been shown to give good correlation with natural weathering. Cycle D (see Annex F): This cycle is specified in Japanese Standard JIS K 5621-2003,
26、 Anticorrosive paint for general use. It is intended that other cycles will be added at later revisions of this part of ISO 11997, as they are developed for evaluating other paint types. ISO 11997-2 describes a method for determining the cyclic corrosion resistance of paints which includes UV exposu
27、re as part of the cycle. It has been found to give good correlation with natural weathering for industrial maintenance coatings. Copyright International Organization for Standardization Reproduced by IHS under license with ISO Not for ResaleNo reproduction or networking permitted without license fro
28、m IHS-,-,-Copyright International Organization for Standardization Reproduced by IHS under license with ISO Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-INTERNATIONAL STANDARD ISO 11997-1:2005(E) ISO 2005 All rights reserved 1Paints and varnishes Determination o
29、f resistance to cyclic corrosion conditions Part 1: Wet (salt fog)/dry/humidity 1 Scope This part of ISO 11997 describes a method for the determination of the resistance of coatings to one of four defined cycles of wet (salt fog)/dry/humidity conditions using specified solutions. 2 Normative referen
30、ces The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1513, Paints and varnishes Examination an
31、d preparation of samples for testing ISO 1514, Paints and varnishes Standard panels for testing ISO 2808, Paints and varnishes Determination of film thickness ISO 3270, Paints and varnishes and their raw materials Temperatures and humidities for conditioning and testing ISO 3696, Water for analytica
32、l laboratory use Specification and test methods ISO 4628-1, Paints and varnishes Evaluation of degradation of paint coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance Part 1: General introduction and designation system ISO 4628-2, Paints and varni
33、shes Evaluation of degradation of paint coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance Part 2: Assessment of degree of blistering ISO 4628-3, Paints and varnishes Evaluation of degradation of paint coatings Designation of quantity and size of
34、defects, and of intensity of uniform changes in appearance Part 3: Assessment of degree of rusting ISO 4628-4, Paints and varnishes Evaluation of degradation of paint coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance Part 4: Assessment of degree
35、of cracking ISO 4628-5, Paints and varnishes Evaluation of degradation of paint coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance Part 5: Assessment of degree of flaking ISO 15528, Paints, varnishes and raw materials for paints and varnishes Samp
36、ling Copyright International Organization for Standardization Reproduced by IHS under license with ISO Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ISO 11997-1:2005(E) 2 ISO 2005 All rights reserved3 Principle A coated test panel is exposed to a cyclic wet (salt
37、 fog), drying and humidity test schedule and the effects of exposure are evaluated by criteria agreed in advance between the interested parties, these criteria usually being of a subjective nature. 4 Required supplementary information For any particular application, the test method described in this
38、 part of ISO 11997 needs to be completed by the supplementary information given in Annex A. 5 Salt fog test solution Prepare the salt fog test solution by dissolving the salt or salts as given in Annexes C, D, E and F in water conforming to at least grade 2 of ISO 3696, to produce the required conce
39、ntration. The salts shall be of analytical grade or visually white, and conform with the purity requirements given in Table 1. Table 1 Purity of salts Impurity Maximum mass fraction of impurity % Method of determination Total 0,5 Calculated as a percentage of the dry salt Iodide 0,1 Calculated as a
40、percentage of the dry salt Copper 0,001 Determined by spectrophotometry or another method of similar accuracy Nickel 0,001 Determined by spectrophotometry or another method of similar accuracy If the pH of the solution is outside the required range (see Annexes C, D, E and F), the presence of undesi
41、rable impurities in the salt or the water or both shall be investigated. The pH determination shall be based on electrometric measurement at 25 C, but a narrow-range indicator paper which can be read in increments of 0,3 pH-units or less and which has been calibrated against electrometric measuremen
42、ts may be used in routine checks. Any necessary corrections shall be made by adding hydrochloric acid, sodium hydrogen carbonate (both of purity conforming to the requirements of Table 1) or analytical-grade sodium hydroxide, of appropriate concentrations. NOTE Attention is drawn to the possible cha
43、nges in pH resulting from loss of carbon dioxide from the solution when it is sprayed, or from dissolution of carbon dioxide from the ambient atmosphere. Such changes may be avoided by reducing the carbon dioxide content of the solution by, for example, heating it to a temperature above 35 C before
44、it is placed in the cabinet or making the solution from freshly boiled water. Filter the solution before placing it in the reservoir of the cabinet, in order to remove any solid matter which might block the apertures of the spraying device. Copyright International Organization for Standardization Re
45、produced by IHS under license with ISO Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ISO 11997-1:2005(E) ISO 2005 All rights reserved 36 Apparatus Ordinary laboratory apparatus and glassware, together with the following: 6.1 Spray cabinet, made of, or lined with,
46、 material resistant to corrosion by the sprayed solution and having a roof which prevents condensed moisture dripping onto the test specimens. The cabinet shall have a capacity of not less than 0,4 m3in order to ensure even distribution of the spray. The size and shape of the cabinet shall be such t
47、hat the salt fog deposition rate is within the limits given in Annexes C, D, E and F. NOTE Cabinets with a volume greater than 2 m3will be difficult to operate unless careful consideration is given to their design and construction. Factors to be taken into consideration in the design and constructio
48、n of the cabinet are given in Annex B. If the cabinet has been used for a spray test, or for any other purpose, using a solution differing from that specified for the current test cycle, it shall be thoroughly cleaned before use. 6.2 Hot-air blowers, capable of maintaining the cabinet and its conten
49、ts at the specified temperatures and achieving the required heating rates (see Annexes C, D, E and F). The temperature shall be controlled by a thermostat element placed within the cabinet at least 100 mm from the walls of the cabinet. 6.3 Means for spraying the salt solution, comprising a supply of clean co
