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1、INTERNATIONAL STANDARD IS0 6370-2 First edition 1991-12-01 Vitreous and porcelain enamels - Determination of the resistance to abrasion - Part 2: Loss in mass after sub-surface abrasion 6maux vitrifitis - Dgtermination de la rCsistance 9 /abrasion - Pat-tie 2: Perte de masse apr 400 g of balls of 3
2、mm in diameter; 250 g of balls of 2 mm in diameter. All 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 re- quirements of IS0 683-1711. 5.4 Pipette, of 25 ml nominal capacity, class B at least, comp
3、lying with the requirements of IS0 648. 5.5 Abrasive, grains of fused aluminium oxide, of grain size P 80, complying with the FEPA-Standard 43-GB-1984. 5.6 Reference glass plates, square plates, with a side length of 100 mm and thickness 3 mm, consist- ing of float glass*). For each test, a set of t
4、hree ref- erence glass plates is required. For identification of the float-bath surface of the glass plates, see annex A. 5.7 Drying oven, capable of maintaining tempera- tures of at least 130 “C. 5.6 Desiccator, with an internal diameter of 200 mm, for example. 6 Test specimens 6.1 Prepare the test
5、 specimens in accordance with the International Standards for the appropriate basis metal. NOTE 1 The production of the specimens for testing vitreous and porcelain enamels for sheet steel and cast iron is specified in IS0 2723121 and IS0 2724Y respect- ively. 6.2 Rinse each test specimen and refere
6、nce glass plate with water (4.2) and wipe it thoroughly with ethanol (4.1). Dry the test specimens and the refer- ence glass plates in the drying oven (5.7) for 2 h at 120 “C f 5 “C. Remove them from the oven and al- low them to stand for at least 2 h in the desiccator (5.8) and finally weigh each t
7、o the nearest 0,2 mg (initial mass). 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 the oscillating table of the abrasion testing apparatus (5.1) with the aid of the ret
8、aining 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 rings (see IS0 6370-1:1991, figure 1). 7.3 Fill each retaining ring with an abrading ch
9、arge and close it with the stopper. The abrading charge consists of 80 g of steel balls (5.3) of 4 mm in diameter; 60 g of steel balls (5.3) of 3 mm in diameter; 35 g of steel balls (5.3) of 2 mm in diameter; 20 ml + 0,2 ml of water (4.2); 3 g f 0,Ol g of abrasive (5.5). The limiting deviations in m
10、ass for the balls: mass of each single ball. 7.4 Start the oscillating table of the abrasion test- ing apparatus for a period of 30 min + 1 min, corre- sponding to 9 000 rotations f 300 rotations. Then remove the specimens and reference glass plates, and thoroughly rinse the test specimens, the refe
11、r- ence glass plates, the retaining rings and the seal- ing rings under running water. Dry the test specimens and reference glass plates in air and re- place 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 t
12、hickness 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 repeat the whole procedure a third time. If the vitreous and porcelain enamel coat being tested
13、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 thor- oughly under running water and then with water (4.2). Dry the test specimens and the reference glass 2)
14、Float glass is glass 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. 2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Re
15、sale, 04/24/2007 23:39:13 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 6370-2:1991(E) plates in the drying oven (5.7) for 2 h at 120 “C + 5 “C. Then allow them to stand for at least 2 h in the desiccator (5.8) and finally weigh each to the nearest 0,2 mg (final mass)
16、. NOTE 2 A porous surface of the test specimen after abrasion can cause an increase in mass due to the ab- sorption of water. This phenomenon shall be stated in the test report. 8 Expression of results 8.1 Calculate, for each test specimen and refer- ence glass plate, the loss in mass, Am, in milli-
17、 grams. Calculate the relative amount of wear IV, using equation (1): Am, + Am, + Am, where Ants,1 Ams.2 and A%3 An, are the respective losses in mass of the three reference glass plates tested. 8.2 Also calculate the value (X for the test specimen tested and the reference glass plates tested using
18、equation (2): a= (Am, + Am, + AnzJ(Amf + A$ + Am: - - Am,Am, - Am,Am, - Am,AmJ I2 (2) The abrasion test is considered as reliable if, for each test specimen tested, as 60 and, for each reference glass plate tested, aR 60 If the values 01s and/or a are less than 60, carry out a further test with new
19、test specimens. (See also annex B.) 9 Test report The test report shall include the following informa- tion: a) a reference to this part of IS0 6370; b) a description of the test specimens; c) the relative amount of wear, W,; d) in case of interruption, duration of the abrasion test; e) a statement,
20、 if appropriate, that the surface of the test specimen was porous after abrasion. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 23:39:13 MDTNo reproduction or networking permit
21、ted without license from IHS -,-,- IS0 6370-2:1991(E) Annex A (informative) Identification of the float-bath surface of the reference glass plates The float-bath surface of the glass may be identified by one of the three following methods. A.1 Chemical method A.1 .l Reagents A.l.l.l Etching solution
22、, made up of 10 volumes of concentrated hydrochloric acid; 10 volumes of distilled water; 8 volumes of hydrofluoric acid, 40 % (V/V) thoroughly mixed. A.1.1.2 Cacotheline, 0,l % (V/v) solution in dis- tilled water. A.l.2 Procedure Place 2 or 3 drops of the etching solution (A.l.l.l) on the surface,
23、followed by 1 or 2 drops of the cacotheline solution (A.1.1.2). A.1.3 Expression 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 a ultraviolet filter giving a peak output i
24、n the range of wavelengths between 254 nm and 365 nm, arranged as shown in figureA.l. V / / / / / / / Glass Figure A.1 - Arrangement for the ultraviolet method When viewed from the angle shown in figureA. in a dark room, the float-bath surface exhibits a slight fluorescence. WARNING - Ultraviolet ra
25、diation in this region of the spectrum will damage the eyes and suitable protec- tive ultraviolet-filter goggles must be worn! A.3 Energy dispersion analysis method Comparison of the two surfaces of the glass by en- ergy dispersion analysis will easily show up the tin content of the float-bath surfa
26、ce which is not present on the other surface. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 23:39:13 MDTNo reproduction or networking permitted without license from IHS -,-,- I
27、S0 6370-2:1991(E) Annex B (informative) Reasons for the test conditions specified in 8.2 The values as and an are closely connected with basic terms of the theory of error calculation. To calculate the statistical error of the mean arithmetic values z, = -$ (Am, + A%, + Am,) according to the general
28、 equation 1 n %= n(n-1) I I c (x, - x)2 i=l the following equations are valid: =Amf+Am+A2- - Am,Am, - A%Am, - Am,AmJ12 For a confidence level of 95 % of three measure- ments, the fractile of the Student-Fisher distribution is tss = 4,3. Consequently, the following inequations are obtained if relativ
29、e errors of the mean values of less than 7 % are required. 4,3%is Am, 60 and aR 60 According to the law of Gauss for the error propa- gation and assuming a probability of 90 %, the error for the determination of the relative amount of wear W, is less than J( 0,07)2 + (0,07)2 z O,l, or 10 % if the st
30、ated requirements for ccs and aR are fulfilled. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 23:39:13 MDTNo reproduction or networking permitted without license from IHS -,-,-
31、 IS0 6370-2:1991(E) Annex C (informative) Bibliography I IS0 683-17:1976, Heat-treated steels, alloy steels and free-cuffing steels - Part 17: Ball and roller bearing steels. 2 IS0 2723:1973, Vitreous and porcelain enamels for sheet steel - Production of specimens for testing. 3 IS0 2724:1973, Vitre
32、ous and porcelain enamels for cast iron - Production of specimens for testing. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 23:39:13 MDTNo reproduction or networking permitted
33、 without license from IHS -,-,- IS0 6370-2:1991(E) UDC 666.293:620.176.16 Descriptors: coatings, non metallic coatings, ceramic coatings, vitreous enamels, tests, abrasion tests, determination, abrasion resistance, mass losses. Price based on 6 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 23:39:13 MDTNo reproduction or networking permitted without license from IHS -,-,-