1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 6370-2:2011Vitreous and porcelain enamels Determination of theresistance to abrasionPart 2: Loss in mass after sub-surfaceabrasionBS ISO 6370-2:2011 BRITISH STANDARDNation
2、al forewordThis British Standard is the UK implementation of ISO 6370-2:2011. Itsupersedes BS ISO 6370-2:1991 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee STI/36, Vitreous enamel coatings.A list of organizations represented on this committee can beob
3、tained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 74996 4ICS 25.220.50Compliance with a British Standard cannot confer immunity fromlegal obligations.This
4、 British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 November 2011.Amendments issued since publicationDate Text affectedBS ISO 6370-2:2011Vitreous and porcelain enamels Determination of the resistance to abrasion Part 2: Loss in mass after sub-surfa
5、ce abrasionmaux vitrifis Dtermination de la rsistance labrasion Partie 2: Perte de masse aprs abrasion de la couche superficielle ISO 2011Reference numberISO 6370-2:2011(E)Second edition2011-11-01ISO6370-2INTERNATIONAL STANDARDBS ISO 6370-2:2011ISO 6370-2:2011(E)COPYRIGHT PROTECTED DOCUMENT ISO 2011
6、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 below or ISOs member body in the countr
7、y of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in Switzerlandii ISO 2011 All rights reservedBS ISO 6370-2:2011ForewordISO (the International Organization for Standardization) is a worl
8、dwide 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 established has the right to be represented on
9、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 standardization.International Standards are drafted in
10、 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 voting. Publication as an International Standard r
11、equires 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 such patent rights.ISO 6370-2 was prepared by Techn
12、ical 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 title Vitreous and porcelain enamels Determination of th
13、e resistance to abrasion: Part 1: Abrasion testing apparatus Part 2: Loss in mass after sub-surface abrasionISO 6370-2:2011(E) ISO 2011 All rights reserved iiiBS ISO 6370-2:2011IntroductionExtensive tests have shown that, with the comparative method described in this part of ISO 6370, the uncertaint
14、y 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 standardized method can only be carried out with the aim o
15、f 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 min were sufficient to obtain comparable results. If th
16、e 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 proportional to the test duration.ISO 6370-2:2011(E)iv I
17、SO 2011 All rights reservedBS ISO 6370-2:2011INTERNATIONAL STANDARD ISO 6370-2:2011(E)Vitreous and porcelain enamels Determination of the resistance to abrasion Part 2:Loss in mass after sub-surface abrasionWARNING This International Standard may not be compliant with some countries health and safet
18、y 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 matters and legislations associated with its use. It is the respons
19、ibility 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 International Standard does not in itself confer immunity from
20、 legal obligations.1 ScopeThis 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 referencesThe following referenced documents are indispensable for the application
21、 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 pipettesISO 683-17, Heat-treated steels, alloys steels and free-cutting steels Part
22、 17: Ball and roller bearing steelsISO 3696, Water for analytical laboratory use Specification and test methodsISO 6344-2, Coated abrasives Grain size analysis Part 2: Determination of grain size distribution of macrogrits P12 to P220ISO 6370-1:1991, Vitreous and porcelain enamels Determination of t
23、he resistance to abrasion Part 1: Abrasion testing apparatusISO 28722, Vitreous and porcelain enamels Production of specimens for testing enamel on sheet steel, sheet aluminium and cast iron3 PrincipleMounting of three similarly enamelled test specimens and three reference glass plates in the testin
24、g 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 of the relative amount of wear wrfrom the mean of the mass losses for the
25、three test specimens and the three reference glass plates.4 ReagentsFor cleaning the test specimens and the reference glass plates, use the following reagents. ISO 2011 All rights reserved 1BS ISO 6370-2:20114.1 Ethanol (C2H5OH), with a volume fraction between 96 % and 98 %.4.2 Distilled water, or w
26、ater of equivalent purity (grade 3 water complying with the requirements of ISO 3696).5 Apparatus and materials5.1 Abrasion testing apparatus, complying with the requirements of ISO 6370-1.5.1.1 Balance, accurate to 0,2 mg.5.1.2 Pipette, of nominal capacity 25 ml , at least class B, complying with t
27、he 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 length of 100 mm and thickness 3 mm, consisting of float glass. For each test, a set of th
28、ree 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 heated liquid of density greater than that of the glass.5.2 Material.5.2.1 Steel balls. For eac
29、h 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 that are 2 mm in diameter.Balls shall consist of the same stainless steel of the type used for
30、 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 requirements of ISO 6344-2.6 Test specimens6.1 Prepare the test specimens in accordance with the Inter
31、national 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 specimen and reference glass plate with water (4.2) and wipe it thoroughly with ethanol (4.1). Dry
32、 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 weigh each specimen to the nearest 0,2 mg (initial mass).ISO 6370-2:2011(E)2 ISO 2011 All rights reser
33、vedBS ISO 6370-2:20117 Procedure7.1 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 the oscillating table of the abrasion testing apparatus (5.1) with the aid of the retaining rings, seali
34、ng 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 rings (see ISO 6370-1:1991, Figure 1).7.3 Fill each retaining ring with an abrading charge and close it wi
35、th 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 mm in diameter; 20 ml 0,2 ml of water (4.2); 3 g + 0,01 g of abrasives (5.2.2).The limiting deviations i
36、n 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 remove the specimens and reference glass plates, and thoroughly rinse the test specimens, the reference
37、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 fresh abrading charge (7.3). The steel balls may be used again after thorough cleaning.If the thickness of t
38、he 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 repeat the whole procedure a third time. If the vitreous and porcelain enamel coat being tested has already di
39、sappeared, 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 running water and then with water (4.2). Dry the test specimens and the reference glass plates in the drying
40、 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 after abrasion can cause an increase in mass due to the absorption of water. This phenomenon shall be stated
41、 in the test report (see Clause 9).8 Expression of results8.1 Calculate, for each test specimen and reference glass plate, the loss in mass, m, in milligrams (mg).Calculate the relative amount of wear wrusing Equation (1):wm m mm m mr=+ + + S S SR R R1 2 31 2 3(1)wheremS1, mS2, mS3are the respective
42、 losses in mass of the three test specimens S1, S2 and S3 tested;mR1, mR2, mR3are the respective losses in mass of the three reference glass plates tested.ISO 6370-2:2011(E) ISO 2011 All rights reserved 3BS ISO 6370-2:20118.2 Calculate the value for the test specimen tested and the reference glass p
43、lates tested using Equation (2): =+ + + ( ) m m mm m m m m m m m m1 2 31222321 2 2 3 1 312(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 Sand/or R are less than 60, carry out a further test with ne
44、w test specimens.For the calculation of uncertainty of measurement of wear, see Annex B.9 Test reportThe test report shall include the following information:a) a reference to this part of ISO 6370;b) a description of the test specimens;c) the relative amount of wear, wr;d) in case of interruption, d
45、uration 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 6370-2:2011Annex A (informative) Identification of the float-bath surface of the reference glass platesNOTE The float-ba
46、th surface of the glass can be identified by one of methods in A.1 to A.3.A.1 Chemical methodA.1.1 ReagentsA.1.1.1 Etching solution, containing 10 ml of concentrated hydrochloric acid, 10 ml of distilled water, and 8 ml of 40 % (volume fraction) hydrofluoric acid,which are thoroughly mixed.A.1.1.2 C
47、acotheline, 0,1 % (volume fraction) solution in distilled water.A.1.2 ProcedurePlace 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 Expression of resultsA.1.3.1 Float-bath surfaceIn 5 s to 10 s, a purple colouration
48、 is observed.A.1.3.2 Top surfaceThe solution remains yellow.A.2 Ultraviolet methodUse a lamp with an ultraviolet filter giving a peak output in the range of wavelengths between 254 nm and 365 nm, arranged as shown in Figure A.1.When viewed from the angle shown in Figure A.1 in a dark room, the float
49、-bath surface exhibits a slight fluorescence.ISO 6370-2:2011(E) ISO 2011 All rights reserved 5BS ISO 6370-2:20111Key1 glassFigure A.1 Arrangement for the ultraviolet methodWARNING Ultraviolet radiation in this region of the spectrum will damage the eyes and suitable protective goggles with an ultraviolet-filter shall be used.A.3 Energy-dispersion-analysis methodComparison of the two surfaces of the glass by energy dispersio
