《ISO-TR-11728-1993.pdf》由会员分享，可在线阅读，更多相关《ISO-TR-11728-1993.pdf（9页珍藏版）》请在三一文库上搜索。
1、TECHNICAL REPORT IS0 TR 11728 First edition 1993-02-01 Anodized aluminium and aluminium alloys - Accelerated test of weather fastness of coloured anodic oxide coatings using cyclic artificial light and pollution gas Aluminium et alliages daluminium anodisb - Essai acc - type 2, when the subject is s
2、till under technical development or where for any other reason there is the future but not immediate possibility of an agreement on an International Standard; - type 3, when a technical committee has collected data of a different kind from that which is normally published as an International Standar
3、d (“state of the art“, for example). Technical Reports of types 1 and 2 are subject to review within three years of publication, to decide whether they can be transformed into Interna- tional Standards. Technical Reports of type 3 do not necessarily have to be reviewed until the data they provide ar
4、e considered to be no longer valid or useful. ISO/TR 11728, which is a Technical Report of type 2, was prepared by Technical Committee lSO/TC 79, Light metals and their alloys, Sub- Committee SC 2. Anodized aluminium. Two methods of evaluating the weathering property of materials in Inter- national
5、Standards exist; one is the outdoor exposure test and the other is the accelerated artificial test. However, there is no International Stan- dard which describes the relation between them or explains why current weathering test methods have been separated into two methods; one is 0 IS0 1993 All righ
6、ts reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without per- mission in writing from the publisher. International Organization for Standardization Case Postale 56 l CH-1211 Geneve 20 l
7、 Switzerland Printed in Switzerland ii Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 01:52:34 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/TR 1
8、1728:1993(E) a test method for the degradation due to light of organic materials and the other is a test method for the corrosion of inorganic materials. However, outdoor deterioration the other actually occurs in an environ- ment combining light degradation and corrosion, so that a combined test in
9、cluding both factors should be considered. For reference, a Japanese standard (JIS-H-8602:1992, Coatings combined with anodic oxidation and organic finishing on aluminium and aluminium alloys) has already adopted a test combining the open-flame (sunshine) carbon arc test and the CASS test. This Tech
10、nical Report intends to provide the most reliable accelerated test method that simulates the outdoor exposure test and can estimate the service life of a material. It is based on the study, which was conducted by lSO/TC 79/SC 2/WG 7 member bodies for about seven years, for planning and executing the
11、 accelerated tests and the outdoor exposure. This study was carried out at three sites for five years, from August 1984 to August 1989, and significant results were obtained. From this point of view, it was considered preferable to publish, in the form of a Technical Report, a new technique for asse
12、ssing the weather fastness of coloured anodized oxidation coatings. . . . Ill Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 01:52:34 MDTNo reproduction or networking permitted
13、without license from IHS -,-,- TECHNICAL REPORT ISO/TR 11728:1993(E) Anodized aluminium and aluminium alloys - Accelerated test of weather fastness of coloured anodic oxide coatings using cyclic artificial light and pollution gas 1 Scope This Technical Report describes an accelerated test method for
14、 assessing the weather fastness, using ar- tificial light and pollution gas, of coloured anodic oxide coatings on aluminium and its alloys. It specifies the apparatus and procedure to be used in conducting a cyclic test of the light exposure to a xenon arc or an open-flame carbon arc, and of the exp
15、osure to sulfur dioxide at a specified concentration under specified conditions of temperature and relative humidity. This test is used to evaluate the weather resistance of coloured anodic oxide coatings under atmospheric conditions, but it does not specify the type of test specimen and the exposur
16、e period. WARNING - The gas used for this test is so haz- ardous that care must be taken when handling it. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this Technical Report. At the time of publication, the editions
17、 indicated were valid. All standards are subject to revision, and parties to agreements based on this Technical Report are encouraged to investi- gate the possibility of applying the most recent edi- tions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid
18、 International Standards. IS0 2135: 1984, Anodizing of aluminium and its alloys - Accelerated test of light fastness of co/owed anodic oxide coatings using artificial light. IS0 7668:1986, Anodized aluminium and aluminium alloys - Measurement of specular reflectance and specular gloss at angles of 2
19、0 degrees, 45 degrees, 60 degrees or 85 degrees. ISO/TR 8125: 1984, Anodizing of aluminium and its al- loys - Determination of colour and colour difference of coloured anodic coatings. IS0 8993: 1989, Anodized aluminium and aluminium alloys - Rating system for the evaluation of pitting corrosion - C
20、hart method. CIE Publication No. 85:1989, Solar spectra/ irradiance. 3 Principle Exposure of anodized samples to cyclic artificial light and a pollution gas atmosphere, and regular observa- tion of any change in colour and gloss, and generation of corrosion. 4 Apparatus 4.1 Light exposure test 4.1.1
21、 Light source Use of either of the two items of equipment de- scribed in 4.1 .l .l and 4.1 .I .2 is recommended. 4.1.1.1 Xenon-arc type Quartz jacketed xenon long-arc lamps emit radiation in a range which extends from below 270 nm in the ultraviolet through the visible spectrum and into the infrared
22、. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 01:52:34 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/TR 11728:1993(E) The radiant energy shoul
23、d be filtered to provide a spectral power distribution that closely approximates that of terrestrial daylight, as described in CIE Publi- cation No. 85. (See table 1 .I Table 1 - Relative spectral irradiance for artificial weathering 280 to 320 I,0 f 02 320 to 360 4,o f or5 360 to 400 68 f 18 I 1) T
24、he spectral irradiance between 280 nm (or 300 nm) and 800 nm is defined as 100 %. I I 1 When using xenon arcs and filters, their character- istics are subject to due to ageing and they shall therefore be replaced at appropriate intervals. Fur- thermore, they are subject to changes due to the ac- cum
25、ulation of dirt and they shall therefore be cleaned at appropriate intervals, The spectral irradiance in the band-pass 280 nm to 800 nm shall preferably be 550 W/m* at the test specimen face. However, when desired and agreed upon by all the parties concerned, another irradiance may be specified for
26、the same or different spectral band-pass. In any case, those values shall be stated in the test report. The irradiance on the test specimen area shall not vary by more than + 10 % at any specimen position. 4.1 .1.2 Open-flame carbon arc The performances or the specifications of the light source and
27、the glass filter are shown in table2. Type 1 glass was specified in most test methods based upon historical precedence. Types 2 and 3 may be used by mutual agreement between the con- cerned parties. Type 1 filter transmits small amounts of radiant en- ergy below the wavelength of daylight that could
28、 be very efficient in producing photochemical reactions. Type 2 filter will remove this short wavelength energy that is not normally present in daylight. Type 3 filter is representative of single strength window glass. 4.1.2 Test enclosure The radiant source(s) shall be located, with respect to the
29、specimens, so that the irradiance at the specimen face complies with 4.1 .l. Should any ozone be generated from operation of the lamp, it shall be isolated from the test specimens and operating personel. If it is in an air stream, it shall be vented directly outside the building. 4.1.3 Black-panel t
30、hermometer The operating temperature shall be determined by maintaining the specified temperature of a black-panel thermometer consisting of a stainless steel panel coated on its exposed surface with a non-selectively absorbing black coating, the spectral reflectance of which shall not exceed 10 % t
31、hroughout the wave- length region 400 nm to 2 500 nm. The normal di- mensions of the panel shall be 70 mm x 150 mm x 1 mm thick. TvDe Table 2 - Performance and use of glass filter Type 11) Type 22) Type 33) _* % % % Spectral transmittance prior 255 nm : 1 275 nm : 2 295 nm : 1 to use 302 nm : 68 320
32、 nm : 75 320 nm : 40 375 nm to 700 nm : 90 400 nm to 700 nm : 65 400 nm to 700 nm : 90 I) Corex D is an example of a suitable glass available commercially. This information is given for the convenience of users of this Technical Report and does not constitute an endorsement by IS0 of the glass named
33、. Equivalent glass products may be used if they can be shown to lead to the same results. 2) Pyrex 7740 is an example of a suitable glass available commercially. This information is given for the convenience of users of this Technical Report and does not constitute an endorsement by IS0 of the glass
34、 named. Equivalent glass products may be used if they can be shown to lead to the same results. 3) Heat resistant glass. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 01:52:34
35、MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/TR 11728:1993(E) The temperature of the panel shall be determined by either a black-coated stem-type bimetallic dial thermometer or a resistance bulb thermometer, which is centrally positioned and firmly attached to the ex
36、posed surface of the black panel. The black panel shall be mounted on the specimen frame with the coated surface facing the lamp. The control of the black-panel temperature should preferably be accomplished by air flowing over the specimen at a controlled temperature. 4.1.4 Relative humidity The rel
37、ative humidity of the air passing over the test specimens may be controlled at an agreed value, if necessary, and measured by suitable instruments in- serted into the test space and shielded from the lamp radiation. 4.1.5 Specimen holders When it is necessary to support specimens for mounting on the
38、 specimen frame, use specimen holders that are made from inert materials which will not interact with the test specimen to influence test results. The specimen holder should not cover any part of the specimen that may critically influence the test result. Unless a specimen backing is specified, the
39、specimen holder shall expose the back of the specimen to the air. Non-oxidizing aluminium alloy and stainless steel have been found to be satisfactory materials. Brass, steel or copper shall not be used. 4.1.6 Radiation meter (optional) If it is mutually agreed upon by the concerned parties, the irr
40、adiance E and the radiant exposure H on the surfaces of the test panels in the test chamber should be measured using a radiation meter with a photoelectronic receptor. The receptor should receive the radiation in a solid angle of 2 sr and evaluate it according to the cosine. The measuring instrument
41、 is to be calibrated accord- ing to the relative spectral distribution of the carbon arc over the wavelength interval specified by the spectral response of the detector. The calibration is to be rechecked after an operation period of 1 year, at the latest. The photoelectronic receptor is prefer- abl
42、y mounted on a support for a test panel, in such a way that it receives the same radiation as a flat test panel surface on the same support. The used irradiance E is to be stated in the test report. 4.2 Gas (SO,) corrosion test The equipment required for this test shall be consti- tuted of a test ch
43、amber equipped with controls of gas concentration, temperature and humidity, sample supports, a gas cylinder suitable for the selected method, a gas quantitative dilution apparatus, and an exhaust air treatment apparatus. Furthermore, the test equipment shall meet the following conditions. a) b) cl
44、d) e) f) It is made from materials which have no effect on the corrosion resistance of the gas employed, and are corrosion-proof themselves. No drop of solution accumulated on the ceiling of the test chamber shall fall on the specimens being tested. It is equipped with a fan capable of foreing the a
45、ir upwards in the chamber, at a rate of 0,l m/s to 0,5 m/s, near the surface of test specimen. It maintains the concentration of a gas within a specified range, with a chamber. gas detector built into the The volume of the test chamber is optional, if the specified test condition is obtained. The te
46、st equipment shall be constructed so that polluted gas does not leak during the test. A schematic diagram of typical apparatus is shown in figure 1. 5 Test specimen 5.1 Preparation 5.1 .I Sampling A test specimen shall be taken from the significant surface of the product or prepared so as to represe
47、nt the product. 5.1.2 Shape and size of test specimen The size of the sample shall be at least 100 mm x 50 mm, preferably 150 mm x 70 mm. However, other sizes may be used upon agreement between the concerned parties. 5.2 Treatment before test The test specimens shall be thoroughly cleaned be- fore t
48、esting. The cleaning method shall depend on the nature of the surface and the contaminants, and shall not include the use of any abrasive or solvent which may attack the surface. 3 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical
49、 Standards 1/9972545001 Not for Resale, 04/25/2007 01:52:34 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/TR 11728:1993(E) 1 2 3 4 5 6 ; 9 10 11 12 13 14 3 2 1 26 10 11 12 13 14 15 16 17 Front section 4 9 12 13 Test chamber Exhaust port Lid Test specimens Water-shield Packing Sample support Air deflecter Chamber heater Fan Gas injection Humidifier Humidifier heater G