1、BRITISH STANDARD BS 6161-18: 1991 Methods of test for Anodic oxidation coatings on aluminium and its alloys Part 18: Determination of surface abrasion resistanceBS6161-18:1991 This British Standard, having been prepared under the directionof the Surface Coatings (other than Paints) Standards Policy
2、Committee, was published under the authority of the Standards Board and comes into effect on 20December1991 BSI 02-1999 The following BSI references relate to the work on this standard: Committee reference SRC/32 Draft for comment 91/50611 DC ISBN 0 580 20090 6 Committees responsible for this Britis
3、h Standard The preparation of this British Standard was entrusted by the Surface Coatings (other than Paints) Standards Policy Committee (SRC/-) to Technical Committee SRC/32, upon which the following bodies were represented: Aluminium Federation Aluminium Finishing Association Aluminium Window Asso
4、ciation Association of Builders Hardware Manufacturers British Lock Manufacturers Association British Metal Finishing Suppliers Association Institute of Corrosion Institute of Metal Finishing Institution of Chemical Engineers Metal Finishing Association Metal Window Federation Ltd. Amendments issued
5、 since publication Amd. No. Date CommentsBS 6161-18:1991 BSI 02-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Principle 1 4 Apparatus 1 5 Procedure 1 6 Test report 2 Figure 1 Position of abrasive paper on block 2 Publication(s) referred to Ins
6、ide back coverBS6161-18:1991 ii BSI 02-1999 Foreword This Part of BS6161 has been prepared under the direction of the Surface Coatings (other than Paints) Standards Policy Committee. At present the following Parts of this British Standard have been published: Part 1: Determination of mass per unit a
7、rea (surface density) of anodic oxidation coatings (gravimetric method); Part 2: Determination of thickness of anodic oxide coatings: non-destructive measurement by split-beam microscope; Part 3: Assessment of sealing quality by measurement of the loss of mass after immersion in phosphoric-chromic a
8、cid solution; Part 4: Assessment of sealing quality by measurement of the loss of mass after immersion in acid solution; Part 5: Estimation of loss of absorptive power of sealed coatings: dye spot test with prior acid treatment; Part 6: Assessment of sealing quality by measurement of admittance or i
9、mpedance; Part 7: Accelerated determination of light fastness of coloured anodic oxidation coatings using artificial light; Part 8: Determination of the fastness to ultraviolet light of coloured anodic oxide coatings; Part 9: Measurement of wear properties with an abrasive wheel wear test apparatus;
10、 Part 10: Measurement of mean specific abrasion resistance with an abrasive jet test apparatus; Part 11: Measurement of total reflectance using a photoelectric reflectometer; Part 12: Measurement of specular reflectance and specular gloss at angles of20,45,60 or85; Part 13: Image clarity test using
11、the Gardam grid; Part 14: Determination of infra-red reflectance; Part 15: Determination of electrical breakdown potential; Part 16: Rating system for the evaluation of pitting corrosion Chart method; Part 17: Rating system for the evaluation of pitting corrosion Grid method; Part 18: Determination
12、of surface abrasion resistance. Further Parts of this standard will be prepared, if required. This Part describes a method of test only and should not be used or quoted as a specification defining abrasion resistance. Reference to this Part should state that the method of test is in accordance with
13、the appropriate method(s) of BS6161-18. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. S
14、ummary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside
15、front cover.BS 6161-18:1991 BSI 02-1999 1 1 Scope This Part of BS6161 describes a method of test for the determination of the surface abrasion resistance of anodic oxidation coatings produced either by sulphuric acid anodizing or by integral colour anodizing (in solutions containing high proportions
16、 of organic acids) on aluminium and its alloys. It is mainly intended for the evaluation of external architectural coatings. Whole articles can be used for this test and, for those passing the test, it is non-destructive. NOTE 1The abrasive wheel test and the abrasive jet test described in BS6161-9
17、and BS6161-10 respectively are, in contrast, destructive of the coating and often of the article. NOTE 2The titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this Part of BS6161, the following definitions apply. 2.1 double
18、stroke one passage backwards and forwards across the test area on the test sample 2.2 test specimen the specimen on which the anodic oxidation coating is to be evaluated 2.3 block resilient support for the abrasive paper during the test 3 Principle The surface abrasion resistance is evaluated by usi
19、ng abrasive papers to determine whether or not the coating is harder than the abrasive papers used. 4 Apparatus 4.1 Glass coated paper, grade00 (very fine), as specified in BS871, strips12mm wide and150mm to200mm long. 4.2 Garnet coated paper, “A” weight, grade no.220, as specified in BS871, strips1
20、2mm wide and150mm to200mm long. NOTEThe hardness of the abrasives on Mohs scale are: glass4.0 to4.5 and garnet6.5 to6.8. 4.3 Resilient support for the paper during the test, 6mm to8mm thick and approximately30mm wide and40mm long. The hardness of the block shall be30IRHD to70IRHD (international rubb
21、er hardness degrees) as measured using the method described in BS903-A26. NOTEA large rectangular rubber or soft plastics pencil eraser may be suitable. 5 Procedure 5.1 Test specimen The test specimen shall normally consist of a production article (or part thereof). It shall be sealed, dry and clean
22、 and, if required, shaped to correspond to its ultimate use in service. 5.2 Method I Wrap a strip of glass coated or garnet coated paper, as appropriate, round the block, so that the abrasive side lies outwards, across the6mm to8mm thickness of the block and so that the ends of the strip may be held
23、 firmly in place by the thumb and forefinger on either side of the blockFigure 1(a). Position the strip so that it lies across the leading end of the block, as it is heldFigure 1(b). Glass coated paper shall be used for a coating produced by sulphuric acid anodizing. Garnet coated paper shall be use
24、d for a coating produced by integral colour anodizing. Press the abrasive strip, backed by the block, against the anodic oxide surface and, applying a firm pressure, make10double strokes with an amplitude of25mm to30mm, keeping to the same track along the surface. After10double strokes, lift the blo
25、ck and examine that part of the abrasive paper which has been in contact with the anodic oxidation coating. A dense deposit of chalky white powder on the abrasive surface of the paper, abraded from the anodic oxidation coating, indicates that the coating is softer than the abrasive; no deposit indic
26、ates that a coating is harder than the abrasive. NOTEAn anodic oxidation coating abraded by glass coated paper will have a wear index greater than1.4, when measured by the abrasive wheel wear test described in BS6161-9. An anodic oxidation coating abraded by garnet coated paper will have a wear inde
27、x of greater than0.9 when measured by the same test.BS6161-18:1991 2 BSI 02-1999 A light deposit of powder, not filling completely all the spaces between the abrasive particles, can indicate the removal of a very thin superficial sealing bloom. If in doubt, wipe clean the test area with a clean, dry
28、 cloth, locate a fresh area of abrasive paper over the edge of the block and repeat the test on the same test area. A dense chalky powder deposit on the abrasive paper indicates an anodic oxidation coating softer than the abrasive; no deposit indicates a coating harder than the abrasive. If in doubt
29、, to confirm that the anodic oxidation coating is softer than the abrasive use methodII (see5.3). 5.3 Method II Test as above in methodI making50 double strokes, providing a fresh area of abrasive paper after every10double strokes. After completion of the abrasion, measure the anodic oxidation coati
30、ng thickness in the centre of the abraded track using an eddy current gauge as described in BS5411-3 and compare the value obtained with that for the unabraded coating adjacent to the wear track. A loss of more than2m indicates that the coating is softer than the abrasive. NOTEThe abraded site may a
31、ppear to gain thickness if the anodic oxide coating is harder than the abrasive due to the abrasive being transferred from the paper to the test site. 6 Test report The test report shall include the following information: a) identification of the test specimen; b) a reference to the method used; c)
32、the abrasive paper used; d) the location of the test area on the test surface; e) the result of the test; f) the date of the test. Figure 1 Position of abrasive paper on blockBS6161-18:1991 BSI 02-1999 Publication(s) referred to BS 871, Specification for abrasive papers and cloths. BS 903, Methods o
33、f testing vulcanized rubber. BS 903-A26, Determination of hardness. BS 5411, Methods of test for metallic and related coatings. BS 5411-3, Eddy current method for measurement of coating thickness of non-conductive coatings on non-magnetic basis metals. BS 6161, Methods of test for anodic oxidation c
34、oatings on aluminium and its alloys. BS 6161-9, Measurement of wear properties with an abrasive wheel wear test apparatus. BS 6161-10, Measurement of mean specific abrasion resistance with an abrasive jet test apparatus. BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | |
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