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1、BRITISH STANDARD BS 6161-16: 1990 ISO 8993:1989 Methods of test for Anodic oxidation coatings on aluminium and its alloys Part 16: Rating system for the evaluation of pitting corrosion Chart method BS 6161-16:1990 This British Standard, having been prepared under the direction of the Surface Coating
2、s (other than Paints) Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 28 February 1990 BSI 04-1999 The following BSI references relate to the work on this standard: Committee reference SRC/32 Draft for comment 87/56062 DC ISBN 0 580 18197 9
3、Committees responsible for this British 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 Windo
4、w Association Association of Builders Hardware Manufacturers British Anodising Association British Lock Manufacturers Association British Metal Finishing Suppliers Association Institute of Metal Finishing Institution of Chemical Engineers Institution of Corrosion Science and Technology Metal Finishi
5、ng Association Metal Window Federation Ltd. Royal Institution of Chartered Surveyors Amendments issued since publication Amd. No.Date of issueComments BS 6161-16:1990 BSI 04-1999i Contents Page Committees responsibleInside front cover National forewordii 1Scope1 2Definitions1 3Procedure for rating1
6、4Test report1 Figure 1 Standard charts for rating designation B (Area of defects 0.02 % and 0.05 % and 0.07 % and 0.10 % and 0.25 % and 0.5 %)9 Table 1 Conversion of chart rating designation into percentage area covered by corrosion pits1 Publications referred toInside back cover BS 6161-16:1990 ii
7、BSI 04-1999 National foreword This Part of BS 6161 has been prepared under the direction of the Surface Coatings (other than Paints) Standards Policy Committee. It is identical with ISO 8993:1989 “Anodized aluminium and aluminium alloys Rating system for the evaluation of pitting corrosion Chart met
8、hod” published by the International Organization for Standardization (ISO). ISO 8993 was prepared by Subcommittee 2 “Anodized aluminium” of Technical Committee ISO/TC 79 “Light metals and their alloys”, with the active participation and approval of the UK. The following Parts of this standard have b
9、een published. Part 1: Determination of mass per unit area (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 t
10、he loss of mass after immersion in phosphoric-chromic acid 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: Assessme
11、nt of sealing quality by measurement of admittance or impedance; 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
12、 properties with an abrasive wheel wear test apparatus; 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 ang
13、les of 20, 45, 60 and 85; Part 13: Image clarity test using 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 evaluati
14、on of pitting corrosion Grid method. It should be noted that in clause 4 “Test report”, the information required for items e, f and g is predetermined and does not arise from this method of test. BS 6161-16:1990 BSI 04-1999iii This Part of BS 6161 describes a method of test only and should not be us
15、ed or quoted as a specification defining anodic oxidation coating quality. Reference to this Part should state that the method of test used is in accordance with BS 6161-16. Textual errors. In 2.2, Note, for “decolouration” read “discolouration”. In Figure 5, caption, for “destignation” read “design
16、ation”. 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. Cross-references International st
17、andardCorresponding British Standard BS 6161 Methods of test for anodic oxidation coatings on aluminium and its alloys ISO 2106-1982Part 1:1984 Determination of mass per unit area (surface density) of anodic oxidation coatings (gravimetric method) (Identical) Summary of pages This document comprises
18、 a front cover, an inside front cover, pages i to iv, pages 1 to 10, 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 the inside front cover. iv blank ISO 8993:1989 (E
19、) BSI 04-19991 1 Scope This International Standard specifies a chart rating system based on standard charts that provides a means of defining levels of performance of anodic oxide coatings on aluminium and its alloys that have been subjected to corrosion tests. This rating system is applicable to pi
20、tting corrosion resulting from accelerated tests; exposure to corrosive environments; practical service tests. It takes into account only pitting corrosion of the basis metal resulting from penetration of the protective anodic coating. 2 Definitions For the purposes of this International Standard, t
21、he following definitions apply. 2.1 significant surface the part of the surface covered by the anodic coating that is essential to the appearance or serviceability of the article NOTEThe edges of the article are not normally included in the significant surface. 2.2 corrosion pit a surface corrosion
22、defect at which the anodic oxide coating is penetrated NOTEDecolouration or other surface defects which do not penetrate the coating do not count as corrosion pits 3 Procedure for rating 3.1 Sample preparation Use one of the following methods to remove corrosion products or deposits on the surface s
23、o that corrosion pits may be clearly discerned: a) wipe with a slurry of fine pumice to abrade away corrosion products and dirt, then rinse in clear water and air dry; or b) dip for 5 min to 10 min in 30 % (m/m) nitric acid, prepared by diluting 1 volume of concentrated nitric acid (A 1,40 g/ml) wit
24、h 1 volume of water at 20 C to 25 C; rinse and dry as indicated in a); or c) dissolve the anodic coating itself in a hot phosphoric-chromic acid mixture; rinse and dry as indicated in a) so that pitting in the aluminium substrate may be discerned. NOTE 1ISO 2106:1982, Anodizing of aluminium and its
25、alloys Determination of mass per unit area (surface density) of anodic oxide coatings Gravimetric method, describes the preparation and use of this reagent for the purposes of dissolution of the anodic oxide coating. NOTE 2Method c) is particularly useful for dark-coloured anodic coatings. 3.2 Deter
26、mination of rating Select an area of at least 5 000 mm2 on the significant surface of the sample. NOTEA mask with an opening of 50 mm 100 mm may be used to define the area to be evaluated. Compare the size and frequency of corrosion pits on the cleaned significant surface with the rating charts give
27、n in Figure 1 to Figure 7. The rating designation will be the chart designation which most closely resembles the corroded specimen, for example, B2 or C5. Disregard effects on the edges of samples. A rating of A indicates no visible corrosion and a rating of H indicates the greatest degree of corros
28、ion covered by this International Standard. A conversion of chart rating designation into percentage area of the significant surface covered by corrosion pits is indicated in Table 1. Table 1 Conversion of chart rating designation into percentage area covered by corrosion pits 4 Test report The test
29、 report shall contain the following particulars: a) a reference to this International Standard; b) a description of the test specimens including, but not limited to, alloy, dimensions, shape, and source of material; c) the processes used, for example, pretreatments, anodizing methods, thickness of a
30、nodic coatings, sealing procedure; d) the method of sample preparation used (see 3.1); e) the number of test specimens for each process variable; RatingPercentage of area of defects ANo defect B1 B2 B3 B4 B5 B6 0,02 and 0,05 and 0,07 and 0,10 and 0,25 and 0,5 ISO 8993:1989 (E) 2 BSI 04-1999 f) the n
31、ature and location of outdoor exposure sites or the laboratory accelerated test used; g) the duration of exposure; h) the rating method used, e.g. whether the rating has been done visually or electronically. In case of evaluation by an electronic method, the specification of the test apparatus shall
32、 be given also; i) the chart rating designation. ISO 8993:1989 (E) BSI 04-19993 Figure 1 Standard charts for rating designation B (Area of defects 0,02 % and 0,05 % and 0,07 % and 0,10 % and 0,25 % and 0,5 %) 10 blank BS 6161-16:1990 BSI 04-1999 Publication referred to See national foreword. BS 6161
33、-16: 1990 ISO 8993:1989 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Rev
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