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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS ISO 11408:1999 ICS 25.
2、220.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Chemical conversion coatings Black oxide coating on iron and steel Specification and test methods Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 08:48:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI This British Stan
3、dard, having been prepared under the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 November 1999 BSI 11-1999 ISBN 0 580 32995 X BS ISO 11408:1999 Amendments issued since publication Amd. No.Date
4、Comments National foreword This British Standard reproduces verbatim ISO 11408:1999 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee STI/38, Chemical conversion coatings, which has the responsibility to: aid enquirers to unde
5、rstand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on
6、 this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled International Standards Correspondence Index,
7、 or by using the Find facility of the BSI Standards Electronic Catalogue. 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
8、immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, page ii and iii, a blank page, pages 1 to 7 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Licensed
9、Copy: sheffieldun sheffieldun, na, Sun Nov 26 08:48:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI A Reference number ISO 11408:1999(E) INTERNATIONAL STANDARD ISO 11408 First edition 1999-08-01 Chemical conversion coatings Black oxide coating on iron and steel Specification and test methods Couches d
10、e conversion chimique Finition noire de la fonte et de lacier Spcifications et mthodes dessai Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 08:48:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 11408:1999(E) ii Contents Page 1 Scope1 2 Normative references1 3 Term and definition .1 4 Info
11、rmation to be supplied by the purchaser to the supplier2 4.1 Essential information .2 4.2 Additional information .2 5 Substrate 2 6 Heat treatment of steels2 6.1 General.2 6.2 Heat treatment before black oxidizing3 6.3 Heat treatment after black oxidizing.3 7 Requirements.3 7.1 Appearance and surfac
12、e quality .3 7.2 Oxalic acid test resistance.3 7.3 Resistance of austenitic stainless steels to neutral salt spray3 8 Sampling.3 Annex A (informative) Processing procedures for iron and stainless steels6 Annex B (informative) Methods of test for neutral surface reaction and for porosity and continui
13、ty7 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 08:48:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 11408:1999(E) iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Int
14、ernational 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 that committee. International organizations, governmental and non-governmental, in liaison w
15、ith 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 accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Sta
16、ndards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 11408 was prepared by Technical Committee ISO/TC 107, Metallic and ot
17、her inorganic coatings, subcommittee SC 8, Chemical conversion coatings. Annexes A and B of this International Standard are for information only. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 08:48:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Sun
18、 Nov 26 08:48:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI INTERNATIONAL STANDARD ISO 11408:1999(E) 1 Chemical conversion coatings Black oxide coating on iron and steel Specification and test methods 1 Scope This International Standard specifies requirements for black oxide coatings on iron and ste
19、el (including cast and wrought iron, carbon steel, low alloyed steel and stainless steel). Black oxide coatings can be used to diminish friction between sliding or bearing surfaces or for decorative purposes or to reduce light reflection. Such coatings, with or without supplementary preservative tre
20、atment, may be used where a black surface is required. Only very limited corrosion protection is obtained under mildly corrosive conditions even with preservative treatment. This International Standard does not specify requirements for the condition, finish or surface roughness of the substrate prio
21、r to black oxidizing. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. Howe
22、ver, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents listed below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
23、 maintain registers of currently valid International Standards. ISO 2064:1996, Metallic and other inorganic coatings Definitions and conventions concerning the measurement of thickness. ISO 4519, Metallic and other inorganic coatings Sampling procedures for inspection by attributes. ISO 9227, Corros
24、ion tests in artificial atmospheres Salt spray tests. ISO 9587, Metallic and other inorganic coatings Pre-treatments of iron and steel to reduce the risk of hydrogen embrittlement. ISO 9588, Metallic and other inorganic coatings Post-coating treatments of iron and steel for reducing the risk of hydr
25、ogen embrittlement. 3 Term and definition For the purposes of this International Standard, the following term and definition apply. 3.1 significant surface part of the article covered or to be covered by the coating and for which the coating is essential for serviceability and/or appearance and wher
26、e the coating has to meet all of the specified requirements ISO 2064:1996, definition 3.1 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 08:48:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 11408:1999(E) 2 4 Information to be supplied by the purchaser to the supplier 4.1 Essential informa
27、tion When ordering articles to be black oxide coated in accordance with this International Standard, the purchaser shall provide the supplier with the following information: a) the number of this International Standard, i.e. ISO 11408; b) the significant surface of the article to be coated, indicate
28、d, for example, on a drawing or by the provision of suitably marked samples; c) the nature and surface condition (see clause 5) of the substrate; d) the sampling procedure to be adopted (see clause 8); e) the appearance of the coating, e.g. by the provision of a suitably marked sample (see 7.1). 4.2
29、 Additional information The following additional information may be provided by the purchaser as appropriate: a) whether the neutral surface reaction has to be tested (see B.1); b) whether porosity and continuity (gross defect) of the black oxide coating has to be tested (see B.2); c) any requiremen
30、ts for supplementary preservative treatment (e.g. oil, wax or lacquer films) and humidity testing after such treatment; d) any requirements for heat treatment before and/or after black oxidizing (see clause 6); e) any requirements for oxalic acid resistance testing (see 7.2); f) any requirements for
31、 wear resistance and its measurement; g) any requirements for coefficient of friction and its measurement; h) any requirements for resistance to neutral salt spray (see 7.3); i) any requirements for adhesion with thicker black oxide coatings. 5 Substrate The surface roughness of the coating will be
32、dependent on the initial roughness of the substrate and this shall therefore not be cause for rejection of the black oxide coating. 6 Heat treatment of steels 6.1 General Heat treatment may be required for certain steel grades to reduce the risk of cracking by hydrogen embrittlement or caustic britt
33、leness. CAUTION High strength steel, of tensile strength Rm 1 000 MPa, may be subjected to caustic embrittlement that could lead to spontaneous cracking under internal or applied stress during the black oxidizing process. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 08:48:56 GMT+00:00 2006
34、, Uncontrolled Copy, (c) BSI ISO 11408:1999(E) 3 6.2 Heat treatment before black oxidizing Pre-treatment shall be carried out in accordance with ISO 9587. The heat treatment shall be carried out before the commencement of any preparation or cleaning treatment using aqueous solutions. 6.3 Heat treatm
35、ent after black oxidizing Post-coating treatment shall be carried out in accordance with ISO 9588. Surface-hardened parts shall be heat treated at a temperature between 190 C and 220 C for not less than 2 h. 7 Requirements 7.1 Appearance and surface quality The coating shall be free of spots of red
36、oxide and shall not be an overall reddish-brown colour. When a part is wiped with a clean Whatman 40 filter paper (or other filter paper of equivalent quality) prior to application of any supplementary preservative treatment, it shall produce no reddish-brown or green smut. NOTE Non-uniformity of co
37、lour and haze is permissible on parts that are locally hardened, welded, cemented, riveted or submitted to other kinds of mechanical treatment. 7.2 Oxalic acid test resistance 7.2.1 When tested in accordance with 7.2.2 prior to the application of any supplementary preservative treatment, the black o
38、xide coating on a part shall conform to Figure 3. 7.2.2 Dissolve 50 g oxalic acid in 1 l of distilled or de-ionized water. Place three drops (; 0,2 ml) of the solution on a flat spot of the black oxide coated surface at ambient temperature. The reaction should occur after 30 s and within 8 min. Afte
39、r 8 min rinse and dry the surface and compare it to Figures 1 to 3. 7.3 Resistance of austenitic stainless steels to neutral salt spray When tested using the salt spray test (NSS test) in accordance with ISO 9227, the significant surface, without any supplementary preservative coating, shall withsta
40、nd 96 h without displaying traces of corrosion (rust). 8 Sampling A random sample of the size required by ISO 4519 shall be selected from the inspection lot. The articles in the sample shall be inspected for conformance to this International Standard and the lot shall be classified as conforming or
41、not conforming to each requirement according to the criteria of the sampling plans in ISO 4519. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 08:48:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 11408:1999(E) 4 Figure 1 Poor quality coating Figure 2 Borderline quality coating Licensed Co
42、py: sheffieldun sheffieldun, na, Sun Nov 26 08:48:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 11408:1999(E) 5 Figure 3 Good quality coating Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 08:48:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 11408:1999(E) 6 Annex A (informative) Proce
43、ssing procedures for iron and stainless steels Table A.1 Typical processing procedures for steels and stainless steels Iron and steel grades Process and suitable chemicals Processing temperature Immersion time C min Carbon steels, low alloy steels, wrought irons, cast irons Alkaline oxidizing: NaOH,
44、 NaNO3, water Processing tanka boiling at 130 to 150 15 to 60 Martensitic stainless steel tempered at less than 480 C Alkaline-chromate: NaOH, NaNO3, Na2Cr2O7 115 to 125 30 to 45 Martensitic stainless steel tempered at 480 C or higher Fused salt; oxidizing: Na2Cr2O7 and/or K2Cr2O7 Molten salt bath 4
45、00 to 455 30 Stainlessb steels (ferritic and austenitic) Alkaline oxidizing a Subsequent tanks, if used, are made from the same chemicals at increased concentrations relative to the previous tank. b Less than 8 % nickel. Table A.2 Different grades of stainless steels Stainless steel grades Nickel co
46、ntent % Hardenability Ferritic Non-hardenable Martensitic 2,5 Hardenable Ferritic-austenitic 4,5 to 7 Non-hardenable Austenitic 7 to 26 Non-hardenable Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 08:48:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 11408:1999(E) 7 Annex B (informative)
47、Methods of test for neutral surface reaction and for porosity and continuity B.1 Neutral surface reaction The test shall be carried out after the last rinsing and drying, but before the oiling. Phenolphthalein test solution or phenolphthalein indicator paper shall be used as follows. a) Prepare phen
48、olphthalein test solution by dissolving 2 g of phenolphthalein in 100 ml of ethanol and keep the solution in a glass dropping bottle. Place 1 to 2 drops of the test solution on the surface to be tested (joints, cavities). b) Moisten the phenolphthalein indicator paper with distilled water and place
49、this paper on the surface to be tested. Residual alkalis shall be deemed to be present if the phenolphthalein drops or indicator paper (as appropriate) turn a rose colour. B.2 Porosity and continuity of the black oxide coating The test shall be conducted by immersion (a) or using droplets (b). Ensure that each test uses a fresh test solution prepared from laboratory reagent grade CuSO4 at a mass fraction of 3 %. a) Immerse the specimen in the test solution (in a glass or plastic bottle) at a temperature of 15 C to 20 C. Aft
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