1、BRITISH STANDARD BS EN ISO 3892:2001 Conversion coatings on metallic materials Determination of coating mass per unit area Gravimetric methods The European Standard EN ISO 3892:2001 has the status of a British Standard ICS 25.220.20; 25.220.99 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY
2、 COPYRIGHT LAWBS EN ISO 3892:2001 This British Standard, 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 September 2001 BSI 07-2001 ISBN 0 580 37986 8 National forew
3、ord This British Standard is the official English language version of EN ISO 3892:2001. It is identical with ISO 3892:2000. It supersedes BS EN ISO 3892:1995 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee STI/37, Methods of test for metallic and rela
4、ted inorganic coatings including corrosion tests, which has the responsibility to: A list of organizations represented on 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 docu
5、ment may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, 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 B
6、ritish Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or prop
7、osals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii to
8、 iv, pages 1 to 5, and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM ENISO3892 July2001 ICS25.220.20 SupersedesENISO3892:1994 Englis
9、hversion ConversioncoatingsonmetallicmaterialsDeterminationof coatingmassperunitareaGravimetricmethods(ISO 3892:2000) Couchesdeconversionsurmatriauxmtalliques DterminationdelamasseparunitdesurfaceMthodes gravimtriques(ISO3892:2000) KonversionsschichtenaufmetallischenWerkstoffen BestimmungderMasseder
10、SchichtenproFlcheneinheit GravimetrischeVerfahren(ISO3892:2000) ThisEuropeanStandardwasapprovedbyCENon4June2001. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandb
11、ibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotif
12、iedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORST
13、ANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2001CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.ENISO3892:2001EForeword ThetextoftheInternationalStandardfromTechnicalCommitteeISO
14、/TC107“Metallicand otherinorganiccoatings“oftheInternationalOrganizationforStandardization(ISO)hasbeen takenoverasanEuropeanStandardbyTechnicalCommitteeCEN/TC262“Metallicand otherinorganiccoatings“,thesecretariatofwhichisheldbyBSI. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherb
15、ypublication ofanidenticaltextorbyendorsement,atthelatestbyJanuary2002,andconflictingnational standardsshallbewithdrawnatthelatestbyJanuary2002. ThisEuropeanStandardsupersedesENISO3892:1994. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsof thefollowingcountriesareboun
16、dtoimplementthisEuropeanStandard:Austria,Belgium, CzechRepublic,Denmark,Finland,France,Germany,Greece,Iceland,Ireland,Italy, Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandtheUnited Kingdom. NOTEFROMCMC TheforewordissusceptibletobeamendedonreceptionoftheGermanlanguage version.Thec
17、onfirmedoramendedforeword,andwhenappropriate,thenormativeannexZAforthe referencestointernationalpublicationswiththeirrelevantEuropeanpublicationswillbecirculatedwith theGermanversion. Endorsementnotice ThetextoftheInternationalStandardISO3892:2000hasbeenapprovedbyCENasa EuropeanStandardwithoutanymod
18、ification. ENISO3892:2001 Reference number ISO 3892:2000(E) ISO 2000 INTERNATIONAL STANDARD ISO 3892 Second edition 2000-06-01 Conversion coatings on metallic materials Determination of coating mass per unit area Gravimetric methods Couches de conversion sur matriaux mtalliques Dtermination de la ma
19、sse de revtement par unit de surface Mthodes gravimtriques ENISO3892:2001 ii ENISO3892:2001 ISO 2983:(0002)E ISO 0002 All irhgts seredevr iii Contents Page Foreword.iv 1 Scope 1 2 Apparatus .1 3 Test pieces .2 4 Reagents and procedures.2 4.1 General2 4.2 Phosphate coatings on iron and steel.2 4.3 Ph
20、osphate coatings on zinc and cadmium.3 4.4 Crystalline phosphate coatings on aluminium and its alloys.3 4.5 Chromate coatings on zinc and cadmium 4 4.6 Chromate and amorphous phosphate coatings on aluminium and its alloys 4 5 Expression of results 5 5.1 Calculation5 5.2 Measurement uncertainty .5 EN
21、ISO3892:2001 ISO 2983:(0002)E iv ISO 0002 All irhgts seredevr Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical comm
22、ittees. 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 with ISO, also take part in the work. ISO collaborates closely with the
23、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 Standards adopted by the technical committees are circulated to the member
24、 bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible f
25、or identifying any or all such patent rights. International Standard ISO 3892 was prepared by Technical Committee ISO/TC 107, Metallic and other inorganic coatings, Subcommittee SC 2, Methods of inspection and coordination of test methods. This second edition cancels and replaces the first edition (
26、ISO 3892:1980), which has been technically revised. ENISO3892:2001 INTENRATIONAL TSANDADR ISO 2983:(0002)E ISO 0002 All irhgts seredevr 1 Conversion coatings on metallic materials Determination of coating mass per unit area Gravimetric methods WARNING The materials, operations and equipment listed i
27、n this International Standard may be hazardous if suitable precautions are not observed. This International Standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this International Standard to establish appropriate safety and
28、 health practices and determine the applicability of regulatory limitations prior to use. 1 Scope This International Standard specifies gravimetric methods for determining the coating mass per unit area of conversion coatings on metallic materials. The methods are applicable to phosphate coatings on
29、 iron and steel; phosphate coatings on zinc and cadmium; phosphate coatings on aluminium and its alloys; chromate coatings on zinc and cadmium; chromate coatings on aluminium and its alloys. The methods are applicable only to conversion coatings that are free from any supplementary coating such as o
30、il, water or solvent-based polymers, or wax. The methods do not indicate the presence of bare spots or sites with thicknesses lower than the specified minimum in the measuring areas. In addition, the single values obtained from each measuring area is the mean thicknesses over that area. There can be
31、 no further mathematical analysis of this single value, e.g. for statistical control purposes. 2 Apparatus 2.1 Vessel, of glass or other appropriate material, in which the conversion coatings can be dissolved. 2.2 Analytical balance, capable of weighing to the nearest 0,1 mg, for weighing the test p
32、ieces under examination before and after dissolution of the conversion coatings. 2.3 Electrical equipment, for electrolytic dissolution (for chromate coatings on zinc and cadmium). ENISO3892:2001 ISO 2983:(0002)E 2 ISO 0002 All irhgts seredevr 3 Test pieces The test pieces shall have a maximum mass
33、of 200 g and a total surface area large enough to give a loss of mass sufficient to be tested with adequate sensitivity, and conformity with the requirements of the relevant material or product specification. In order to achieve adequate accuracy in the determination, the total surface area shall be
34、 in accordance with the values given in Table 1. Table 1 Total surface areas of test pieces Expected mass of coating per unit area g/m 2 Minimum total surface area of coated test piece cm 2 1 W 1u 10 10u 25 25u 50 50 400 200 100 50 25 NOTE In order to achieve an overall measurement uncertainty (see
35、5.2) of 5 %, the surface areas should be measured to within 1 %. 4 Reagents and procedures 4.1 General For the preparation of solutions, unless otherwise stated, use only reagents of recognized analytical grade and only distilled water or water of equivalent purity. The sampling procedure shall be a
36、s specified in the product standard. 4.2 Phosphate coatings on iron and steel 4.2.1 Manganese phosphate coatings 4.2.1.1 Reagent 4.2.1.1.1 Chromium(VI) oxide (CrO 3 ), a 50 g/l aqueous solution. 4.2.1.2 Procedure Dry the test piece (area A, in square centimetres, see 5.1) and weigh it, to the neares
37、t 0,1 mg, using the analytical balance (2.2) (mass m 1 , in milligrams, see 5.1). Then immerse the test piece for 15 min in the reagent (4.2.1.1.1), maintained at 75 C 5 C. Rinse the test piece immediately in clean running water and then in distilled water; dry rapidly and reweigh. Repeat the proced
38、ure until a reasonably constant mass (differing by 0,1 mg) is obtained (mass m 2 , in milligrams, see 5.1). Use freshly prepared reagent for every test piece. ENISO3892:2001 ISO 2983:(0002)E ISO 0002 All irhgts seredevr 3 4.2.2 Zinc phosphate coatings 4.2.2.1 Reagent 4.2.2.1.1 Aqueous solution, cont
39、aining, per litre, 100 g sodium hydroxide, 90 g ethylenedinitrilo tetra-acetic acid, tetrasodium salt dihydrate (EDTA tetrasodium salt) and 4 g triethanolamine. 4.2.2.2 Procedure Dry the test piece (area A, in square centimetres, see 5.1), and weigh it, to the nearest 0,1 mg, using the analytical ba
40、lance (2.2) (mass m 1 , in milligrams, see 5.1). Then immerse the test piece for 5 min in the reagent (4.2.2.1.1), maintained at 75 C 5 C. Rinse the test piece immediately in clean running water and then in distilled water; dry rapidly and reweigh (mass m 2 , in milligrams, see 5.1). Use fresh reage
41、nt for every test piece. 4.2.3 Iron phosphate coatings 4.2.3.1 Reagent 4.2.3.1.1 Chromium(VI) oxide (CrO 3 ), a 50 g/l aqueous solution. 4.2.3.2 Procedure Dry the test piece (area A, in square centimetres, see 5.1) and weigh it, to the nearest 0,1 mg, using the analytical balance (2.2) (mass m 1 , i
42、n milligrams, see 5.1). Then immerse the test piece for 15 min in the reagent (4.2.3.1.1), maintained at 75 C 5 C. Rinse the test piece immediately in clean running water and then in distilled water; dry and reweigh. Repeat the procedure until a reasonably constant mass (differing by 0,1 mg) is obta
43、ined (mass m 2 , in milligrams, see 5.1). Use freshly prepared reagent for every test piece. 4.3 Phosphate coatings on zinc and cadmium 4.3.1 Reagent 4.3.1.1 Ammonium dichromate, solution in 25 % to 30 % mass fraction ammoniac. During preparation of the solution, its temperature shall not exceed 25
44、C. 4.3.2 Procedure Dry the test piece (area A, square centimetres, see 5.1), and weigh it, to the nearest 0,1 mg, using the analytical balance (2.2) (mass m 1 , in milligrams, see 5.1). Then immerse the test piece for 3 min to 5 min in the reagent (4.3.1.1) at room temperature. Carry out this operat
45、ion in a fume cupboard. Rinse the test piece immediately in clean running water and then in distilled water; dry rapidly and reweigh (mass m 2 , in milligrams, see 5.1). Use freshly prepared reagent for every test piece. 4.4 Crystalline phosphate coatings on aluminium and its alloys 4.4.1 Reagent 4.
46、4.1.1 Nitric acid solution, mass fraction 65 % to 70 %. ENISO3892:2001 ISO 2983:(0002)E 4 ISO 0002 All irhgts seredevr 4.4.2 Procedure Dry the test piece (area A, in square centimetres, see 5.1), and weigh it, to the nearest 0,1 mg, using the analytical balance (2.2) (mass m 1 , in milligrams, see 5
47、.1). Then immerse the test piece either for 5 min in the reagent (4.4.1.1) maintained at 75 C 5 C or for 15 min in the same reagent at room temperature. Rinse the test piece immediately in clean running water and then in distilled water; dry rapidly and reweigh (mass m 2 , in milligrams, see 5.1). U
48、se freshly prepared reagent for every test piece. 4.5 Chromate coatings on zinc and cadmium 4.5.1 Reagent 4.5.1.1 Aqueous solution, containing, per litre, 50 g sodium (or potassium) cyanide and 5 g sodium hydroxide. 4.5.2 Procedure Dry the test piece (area A, in square centimetres, see 5.1), aged naturally after application of the chroma
