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1、BRITISH STANDARD CONFIRMED OCTOBER 1990 BS 6041:1981 ISO 4519:1980 Incorporating Amendment No. 1 Method of Sampling of electrodeposited metallic coatings and related finishes: procedures for inspection by attributes ISO title: Electrodeposited metallic coatings and related finishes-Sampling procedur
2、es for inspection by attributes UDC 669.058.7:620 113:658.562 BS 6041:1981 This British Standard, having been prepared under the direction of the Surface Coatings (other than Paints) Standards Committee, was published under the authority of the Executive Board and comes into effect on 31 December 19
3、80 BSI 04-1999 The following BSI references relate to the work on this standard: Committee reference SRC/14 Draft for comment 76/53097 DC ISBN 0 580 11774 X Cooperating organizations The Surface Coatings (other than Paints) Standards Committee, under whose direction this British Standard was prepare
4、d, consists of representatives from the following: Aluminium Federation* Assay Offices Committee of Great Britain Association of Metal Sprayers* BNF Metals Technology Centre* British Jewellers Association* British Jewellery and Giftware Federation Ltd. British Metal Finishing Suppliers Association*
5、British Steel Industry Chemical Industries Association Electricity Supply Industry in England and Wales Engineering Equipment Users Association Galvanizers Association Greater London Council Institute of Metal Finishing* Institute of Sheet Metal Engineering Institute of Vitreous Enamellers Instituti
6、on of Corrosion Science and Technology* Metal Finishing Association* Ministry of Defence Motor Cycle Association of Great Britain Society of Motor Manufacturers and Traders Limited* Vitreous Enamel Development Council Zinc Development Association The organizations marked with an asterisk in the abov
7、e list, together with the following, were directly represented on the Technical Committee entrusted with the preparation of this British Standard: Association of Manufacturers of Domestic Electrical Appliances British Anodising Association British Industrial Fasteners Federation City of London Polyt
8、echnic Department of Industry (National Physical Laboratory) NDT Trade Association Individual company Individual experts Amendments issued since publication Amd. No.Date of issueComments 3746September 1981 Indicated by a sideline in the margin BS 6041:1981 BSI 04-1999i Contents Page Cooperating orga
9、nizationsInside front cover National forewordii 1Scope and field of application1 2References1 3Definitions1 4Product submission2 5Acceptance and rejection3 6Selection of samples (sampling)3 7Sampling plans3 8Determination of acceptability5 Annex Drawing of samples7 Table 1 Sampling of items for non-
10、destructive tests produced by methods other than barrel electroplating5 Table 2 Sampling of barrel electroplating items for non-destructive tests5 Table 3 Sampling for destructive tests (adhesion, hydrogen embrittlement, corrosion resistance, etc.)5 Table 4 Sampling of items for non-destructive test
11、s, produced by methods other than barrel electroplating, for tightened inspection of continuing lots6 Table 5 Sampling of barrel electroplated items for non-destructive tests, for tightened inspection of continuing lots6 Table 6 Limiting quality for testing isolated lots or batches6 Table 7 Random n
12、umbers8 Publications referred toInside back cover BS 6041:1981 ii BSI 04-1999 National foreword This British Standard has been prepared under the direction of the Surface Coatings (other than Paints) Standards Committee in order to provide a practical guide to the sampling of electrodeposited metall
13、ic coatings and related finishes. In this respect, the sampling plans actually included relate to Acceptable Quality Levels of 1.5 % and 4.0 %, the most commonly used levels in this field. Other AQLs may, however, be used and, in these cases, reference should be made to BS 6000 “Guide to the use of
14、BS 6001. Sampling procedures and tables for inspection by attributes” and BS 6001 “Sampling procedures and tables for inspection by attributes”. This British Standard is identical with ISO 4519:1980 “Electrodeposited metallic coatings and related finishes Sampling procedures for inspection by attrib
15、utes”, which was prepared, with the active participation and approval of the United Kingdom, by Sub-committee 2, Methods of inspection and coordination of test methods, of Technical Committee 107, Metallic and other non-organic coatings, of the International Organization for Standardization (ISO). T
16、erminology and conventions. The text of the international standard has been approved as suitable for publication, without deviation, as a British Standard. Some terminology and certain conventions are not identical with those used in British Standards; attention is especially drawn to the following.
17、 The comma has been used throughout as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Where the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. ISO 3269, which is r
18、eferred to in clause 1 as a standard covering mechanical fasteners, which are outside the scope of ISO 4519, and which is in course of preparation, is not essential for the operation of BS 6041. NOTETextual errors. Attention is drawn to a printing error in the note at the beginning of clause 3, wher
19、e the final word should be “items” and not “thems”. The concluding page of the random numbers table in the annex is headed “Table 7”. This should be read as “Table 7”. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsibl
20、e for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International standardCorresponding British Standard ISO 2859-1974BS 6001:1972 Sampling procedures and tables for inspection by attributes (Technically equi
21、valent) ISO 2859 Addendum 1-1977 BS 6000:1972 Guide to the use of BS 6001. Sampling procedures and tables for inspection by attributes (Technically equivalent) ISO 3534-1977BS 5532:1978 StatisticsVocabulary and symbols (Identical) Summary of pages This document comprises a front cover, an inside fro
22、nt cover, pages i and ii, 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. BS 6041:1981 BSI 04-19991 1 Scope and field of applic
23、ation This International Standard establishes sampling plans and procedures for inspection by attributes of electrodeposited metallic coatings. It may be applied to related finishes by agreement between the supplier and the purchaser. It is based on ISO 2859 (see also Addendum 1 to ISO 2859). The sa
24、mpling plans in this International Standard are applicable, but not limited, to the inspection of end items, components, materials in process and finished products in storage. The plans are intended primarily to be used for a continuing series of lots, but they may also be used for the inspection of
25、 isolated lots. However, the assurance given for isolated lots is lower than that given for a continuing series of lots. This International Standard is not applicable to the sampling and testing of mechanical fasteners having electrodeposited metallic coatings or related finishes, in all the circums
26、tances for which procedures for these components are specified in ISO 3269. The sampling plans given in this International Standard are based on AQLs1) of 1,5 and 4,0 %. Other AQLs may be used if specified in the product specification, in which case reference should be made to ISO 2859 and its Adden
27、dum 1. It is also possible to formulate sampling plans based on inspection by variables. 2 References ISO 2859, Sampling procedures and tables for inspection by attributes. ISO 2859/Add. 1, General information on sampling inspection, and guide to the use of the ISO 2859 tables. ISO 3269, Fasteners A
28、cceptance inspection2). ISO 3534, Statistics Vocabulary and symbols. 3 Definitions NOTESome of these definitions are not identical with those in ISO 3534 but have been modified to make them easier to understand by non-statisticians and to make them more readily applicable to electroplated thems. 3.1
29、 inspection the process of measuring, examining, testing, or otherwise comparing the unit of product (see 3.4) with the requirements 3.2 attribute a characteristic or property which is appraised in terms of whether it does or does not exist (for example go or no-go) with respect to a given requireme
30、nt 3.3 inspection by attribute(s) inspection whereby either the unit of product is simply classified as defective or non-defective, or the number of defects in the unit of product is counted, with respect to one or more given requirements 3.4 unit of product the object inspected either to determine
31、its classification as defective or non-defective, or to count the number of defects. It may be a single article, a pair, a set, a length, an area, an operation, a volume, a component of an end item or the end product itself. The unit of product may or may not be the same as the unit of purchase, sup
32、ply, production, or shipment 3.5 acceptance number the maximum number of defects or defective units in the sample that will permit acceptance of the inspection lot 3.6 rejection number the minimum number of defects or defective units in the sample that will cause rejection of the inspection lot 3.7
33、inspection lot a collection of coated articles that are of the same kind, that have been produced to the same specifications, that have been coated by a single supplier at one time, or at approximately the same time, under essentially identical conditions and that are submitted for acceptance or rej
34、ection as a group 3.8 Classification of defects and defectives 3.8.1 method of classifying defects The enumeration of possible defects of the unit of product classified according to their seriousness. A defect is any non-conformance of the unit of product to the specified requirements. Defects are n
35、ormally grouped into one or more of the following classes; however, defects may be grouped into other classes or into sub-classes within these classes. 1) AQL = Acceptable Quality Level. 2) At present at the stage of draft. BS 6041:1981 2 BSI 04-1999 3.8.1.1 critical defect a defect that judgement a
36、nd experience indicate is likely to result in hazardous or unsafe conditions for the individual using, maintaining, or depending upon the unit of product which has an electrodeposited metallic coating or related finish. It may also be a defect in the coating that judgement and experience indicate is
37、 likely to prevent performance of the primary function of a major end item 3.8.1.2 major defect a defect, other than critical, that is likely to result in failure of the finish, or to reduce materially the usability of the unit of product for its intended purpose 3.8.1.3 minor defect a defect that i
38、s not likely to reduce materially the usability of the unit of product for its intended purpose, or is a departure from established standards having little or no bearing on the effective use or operation of the item which has an electrodeposited coating or related finish NOTEInspection for detection
39、 of critical defects may require non-destructive examination of every unit of product in the lot. In this International Standard, all defects not conforming to the specified requirements in the product item specifications for electrodeposited coatings and related finishes are considered to be major.
40、 If specified by the purchaser, the maximum number of defects per hundred items, or the maximum percent defective laid down in this International Standard can be increased for the purpose of sampling inspection of minor defects. 3.8.2 method of classifying defectives A defective is a unit of product
41、 which contains one or more defects. Defectives are usually classified as follows: 3.8.2.1 critical defective a defective which contains one or more critical defects, and which may contain major or minor defects 3.8.2.2 major defective a defective which contains one or more major defects, and which
42、may contain minor defects but no critical defects 3.8.2.3 minor defective a defective which contains one or more minor defects, but no critical or major defects 3.9 expression of non-conformance the extent of non-conformance of a product expressed either in terms of percent defective, or in terms of
43、 defects per hundred items 3.10 percent defective one hundred times the number of defective units of product divided by the total number of units of product inspected, i.e. Percent defective = 4 Product submission 4.1 Lot An inspection lot shall be a collection of items from which a sample shall be
44、randomly drawn and inspected to determine conformance with the acceptance criteria. It may differ from a collection of units of product designated as a lot for other purposes, such as production, shipment, and storage. 4.2 Formation of lots The product shall be assembled into identifiable lots, sub-
45、lots, or in such manner as may be prescribed (see 6.3). Each lot shall, as far as practicable, consist of units of product or separate specimens of the same basic material composition, of a single type, grade or class of the coating or finish, and approximately the same size and shape, processed und
46、er essentially the same conditions, and at essentially the same time (see 7.2.2). 4.3 Lot size The lot size is the number of units of product in a lot. 4.4 Presentation of lots Unless specified by the purchaser in the contract or order, the formation of lots, the lot size and the manner in which the
47、 lot is to be presented and identified shall be designated by the supplier. number of defectives number of units inspected - -100 BS 6041:1981 BSI 04-19993 5 Acceptance and rejection 5.1 Responsibility for tests Unless otherwise specified in the contract or purchase order, the supplier shall be resp
48、onsible for performing all the required tests for compliance with the specified inspection requirements, and the supplier may use his own or any other laboratory facilities suitable for performance of the inspection requirements. The purchaser shall have the right to perform any of the inspections d
49、etailed in the material document, when such action is deemed necessary to ensure that the electrodeposited metallic coating or the related finish conforms to the prescribed requirements. Reports of the test results shall be available for examination by the purchaser for 1 year from the date of acceptance of the material by him. Copies of the test reports and test details shall be furnished when required by the contract or purchase order. 5.2 Acceptability of lots Acceptability of a lo