1、raising standards worldwide NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI Standards Publication BS ISO 6370-2:2011 Vitreous and porcelain enamels Determination of the resistance to abrasion Part 2: Loss in mass after sub-surface abrasionBS ISO 6370-2:2011 BRITISH STANDAR
2、D National foreword This British Standard is the UK implementation of ISO 6370-2:2011. It supersedes BS ISO 6370-2:1991 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee STI/36, Vitreous enamel coatings. A list of organizations represented on this commi
3、ttee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. BSI 2011 ISBN 978 0 580 74996 4 ICS 25.220.50 Compliance with a British Standard cannot confer immunity from l
4、egal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2011. Amendments issued since publication Date Text affectedBS ISO 6370-2:2011 Vitreous and porcelain enamels Determination of the resistance to abrasion Part 2: Lo
5、ss in mass after sub-surface abrasion maux vitrifis Dtermination de la rsistance labrasion Partie 2: Perte de masse aprs abrasion de la couche superficielle ISO 2011 Reference number ISO 6370-2:2011(E) Second edition 2011-11-01 ISO 6370-2 INTERNATIONAL STANDARDBS ISO 6370-2:2011 ISO 6370-2:2011(E)CO
6、PYRIGHT PROTECTED DOCUMENT ISO 2011 All rights reserved. Unless otherwise specified, 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 permission in writing from either ISO at the address bel
7、ow or ISOs member body in the country of the requester. ISO copyright office Case postale 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 2011 All rights reservedBS ISO 6370-2:2011 Foreword ISO (the Internation
8、al 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 e
9、stablished 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 standard
10、ization. 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 International Standards adopted by the technical committees are circulated to the member bodies for vo
11、ting. 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 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all su
12、ch patent rights. ISO 6370-2 was prepared by Technical Committee ISO/TC 107, Metallic and other inorganic coatings. This second edition cancels and replaces the first edition (ISO 6370-2:1991), of which it constitutes a minor revision. ISO 6370 consists of the following parts, under the general titl
13、e Vitreous and porcelain enamels Determination of the resistance to abrasion: Part 1: Abrasion testing apparatus Part 2: Loss in mass after sub-surface abrasion ISO 6370-2:2011(E) ISO 2011 All rights reserved iiiBS ISO 6370-2:2011 Introduction Extensive tests have shown that, with the comparative me
14、thod described in this part of ISO 6370, the uncertainty of measurement of test results is 5 %. Furthermore, absolute quantities for the amount of wear give little information, because abrasives used in practice differ considerably in their effect on enamelled surfaces. Each abrasion test with a sta
15、ndardized method can only be carried out with the aim of providing a general classification of various vitreous and porcelain enamels in relation to each other. Absolute quantities for the amount of wear are therefore not required. Numerous tests have shown that the three required test periods of 30
16、 min were sufficient to obtain comparable results. If the vitreous and porcelain enamel coat to be tested is thicker than 0,2 mm, it is not necessary to determine the loss in mass after each 30 min test period, because the abrasion under the conditions described in this part of ISO 6370 is directly
17、proportional to the test duration. ISO 6370-2:2011(E)iv ISO 2011 All rights reservedBS ISO 6370-2:2011 INTERNATIONAL STANDARD ISO 6370-2:2011(E) Vitreous and porcelain enamels Determination of the resistance to abrasion Part 2: Loss in mass after sub-surface abrasion WARNING This International Stand
18、ard may not be compliant with some countries health and safety legislations and calls for the use of substances and/or procedures that may be injurious to health if adequate safety measures are not taken. This International Standard does not address any health hazards, safety or environmental matter
19、s and legislations associated with its use. It is the responsibility of the user of this International Standard to establish appropriate health, safety and environmentally acceptable practices and take suitable actions to comply with any national and international regulations. Compliance with this I
20、nternational Standard does not in itself confer immunity from legal obligations. 1 Scope This part of ISO 6370 specifies a test method for determining the resistance of vitreous and porcelain enamel coatings to abrasion by rubbing, grinding or other mechanical effects. 2 Normative references The fol
21、lowing 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 648, Laboratory glassware One-mark pipettes ISO 683-
22、17, Heat-treated steels, alloys steels and free-cutting steels Part 17: Ball and roller bearing steels ISO 3696, Water for analytical laboratory use Specification and test methods ISO 6344-2, Coated abrasives Grain size analysis Part 2: Determination of grain size distribution of macrogrits P12 to P
23、220 ISO 6370-1:1991, Vitreous and porcelain enamels Determination of the resistance to abrasion Part 1: Abrasion testing apparatus ISO 28722, Vitreous and porcelain enamels Production of specimens for testing enamel on sheet steel, sheet aluminium and cast iron 3 Principle Mounting of three similarl
24、y enamelled test specimens and three reference glass plates in the testing apparatus; simultaneous exposure of the separated test specimens and reference glass plates to the abrasion attack of a mixture of fused aluminium oxide grains, steel balls and water for three periods of 30 min; calculation o
25、f the relative amount of wear w rfrom the mean of the mass losses for the three test specimens and the three reference glass plates. 4 Reagents For cleaning the test specimens and the reference glass plates, use the following reagents. ISO 2011 All rights reserved 1BS ISO 6370-2:2011 4.1 Ethanol (C
26、2 H 5 OH), with a volume fraction between 96 % and 98 %. 4.2 Distilled water, or water of equivalent purity (grade 3 water complying with the requirements of ISO 3696). 5 Apparatus and materials 5.1 Abrasion testing apparatus, complying with the requirements of ISO 6370-1. 5.1.1 Balance, accurate to
27、 0,2 mg. 5.1.2 Pipette, of nominal capacity 25 ml , at least class B, complying with the requirements of ISO 648. 5.1.3 Drying oven, capable of maintaining temperatures of at least 130 C. 5.1.4 Desiccator, with an internal diameter of 200 mm. 5.1.5 Reference glass plates, square plates with a side l
28、ength of 100 mm and thickness 3 mm, consisting of float glass. For each test, a set of three reference glass plates is required. For identification of the float-bath surface of the glass plates, see Annex A. NOTE Float glass is made by a process in which a ribbon of hot glass is floated upon a heate
29、d liquid of density greater than that of the glass. 5.2 Material. 5.2.1 Steel balls. For each test on a set of three specimens and three reference glass plates, the following are required (see 7.3): 500 g of balls that are 4 mm in diameter; 400 g of balls that are 3 mm in diameter; 250 g of balls th
30、at are 2 mm in diameter. Balls shall consist of the same stainless steel of the type used for bearings and shall be hardened, for example, type of steel 20 complying with the requirements of ISO 683-17. 5.2.2 Abrasives, grains of fused aluminium oxide, of grain size P 80, complying with the requirem
31、ents of ISO 6344-2. 6 Test specimens 6.1 Prepare the test specimens in accordance with the International Standards for the appropriate basis metal. The production of the specimens for testing vitreous and porcelain enamels for sheet steel and cast iron is specified in ISO 28722. 6.2 Rinse each test
32、specimen and reference glass plate with water (4.2) and wipe it thoroughly with ethanol (4.1). Dry the test specimens and the reference glass plates in the drying oven (5.1.3) for 2 h at 120 C 5 C. Remove them from the oven and allow them to stand for at least 2 h in the desiccators (5.1.4) and weig
33、h each specimen to the nearest 0,2 mg (initial mass). ISO 6370-2:2011(E)2 ISO 2011 All rights reservedBS ISO 6370-2:2011 7 Procedure 7.1 Carry out one test with each set of at least three test specimens and three reference glass plates. 7.2 Fix the test specimens and the reference glass plates on th
34、e oscillating table of the abrasion testing apparatus (5.1) with the aid of the retaining rings, sealing rings and clamping devices, so that the cover coat sides of the test specimens and the float-bath surface (see Annex A) of the reference glass plates are facing the interior of the retaining ring
35、s (see ISO 6370-1:1991, Figure 1). 7.3 Fill each retaining ring with an abrading charge and close it with the stopper. The abrading charge consists of the following: 80 g of steel balls (5.2.1) that are 4 mm in diameter; 60 g of steel balls that are 3 mm in diameter; 35 g of steel balls that are 2 m
36、m in diameter; 20 ml 0,2 ml of water (4.2); 3 g + 0,01 g of abrasives (5.2.2). The limiting deviations in mass for the balls: mass of each single ball. 7.4 Start the oscillating table of the abrasion testing apparatus for a period of 30 min 1 min, corresponding to 9 000 rotations 300 rotations. Then
37、 remove the specimens and reference glass plates, and thoroughly rinse the test specimens, the reference glass plates, the retaining rings and the sealing rings under running water. Dry the test specimens and reference glass plates in air and replace them on the abrasion testing apparatus with a fre
38、sh abrading charge (7.3). The steel balls may be used again after thorough cleaning. If the thickness of the enamel coat to be tested is less than 0,2 mm, it is recommended to weigh the test specimen before the next test period. Start the oscillating table for a further period of 30 min and then rep
39、eat the whole procedure a third time. If the vitreous and porcelain enamel coat being tested has already disappeared, interrupt the test. 7.5 After three test periods of 30 min, remove the test specimens and the reference glass plates from the abrasion testing apparatus. Rinse them thoroughly under
40、running water and then with water (4.2). Dry the test specimens and the reference glass plates in the drying oven (5.1.3) for 2 h at 120 C 5 C. Then allow them to stand for at least 2 h in the desiccator (5.1.4) and weigh each to the nearest 0,2 mg (final mass). A porous surface of the test specimen
41、 after abrasion can cause an increase in mass due to the absorption of water. This phenomenon shall be stated in the test report (see Clause 9). 8 Expression of results 8.1 Calculate, for each test specimen and reference glass plate, the loss in mass, m, in milligrams (mg). Calculate the relative am
42、ount of wear w rusing Equation (1): (1) where m S1 , m S2 , m S3are the respective losses in mass of the three test specimens S1, S2 and S3 tested; m R1 , m R2 , m R3are the respective losses in mass of the three reference glass plates tested. ISO 6370-2:2011(E) ISO 2011 All rights reserved 3BS ISO
43、6370-2:2011 8.2 Calculate the value for the test specimen tested and the reference glass plates tested using Equation (2): m m m m m m m m m m m m (2) The abrasion test is considered as reliable if, for each test specimen tested, S 60 and, for each reference glass plate tested, R 60. If the values S
44、and/or R are less than 60, carry out a further test with new test specimens. For the calculation of uncertainty of measurement of wear, see Annex B. 9 Test report The test report shall include the following information: a) a reference to this part of ISO 6370; b) a description of the test specimens;
45、 c) the relative amount of wear, w r ; d) in case of interruption, duration of the abrasion test; e) a statement, if appropriate, that the surface of the test specimen was porous after abrasion. ISO 6370-2:2011(E)4 ISO 2011 All rights reservedBS ISO 6370-2:2011 Annex A (informative) Identification o
46、f the float-bath surface of the reference glass plates NOTE The float-bath surface of the glass can be identified by one of methods in A.1 to A.3. A.1 Chemical method A.1.1 Reagents A.1.1.1 Etching solution, containing 10 ml of concentrated hydrochloric acid, 10 ml of distilled water, and 8 ml of 40
47、 % (volume fraction) hydrofluoric acid, which are thoroughly mixed. A.1.1.2 Cacotheline, 0,1 % (volume fraction) solution in distilled water. A.1.2 Procedure Place 2 or 3 drops of the etching solution (A.1.1.1) on the surface, followed by 1 or 2 drops of the cacotheline solution (A.1.1.2). A.1.3 Exp
48、ression of results A.1.3.1 Float-bath surface In 5 s to 10 s, a purple colouration is observed. A.1.3.2 Top surface The solution remains yellow. A.2 Ultraviolet method Use a lamp with an ultraviolet filter giving a peak output in the range of wavelengths between 254 nm and 365 nm, arranged as shown
49、in Figure A.1. When viewed from the angle shown in Figure A.1 in a dark room, the float-bath surface exhibits a slight fluorescence. ISO 6370-2:2011(E) ISO 2011 All rights reserved 5BS ISO 6370-2:2011 Key 1 glass Figure A.1 Arrangement for the ultraviolet method WARNING Ultraviolet radiation in this regio
