AECMA PREN 2133-1995 Aerospace Series Cadmium Plating of Steels with Maximum Specified Tensile Strength Equal to or Less Than 1 450 MPa Copper Copper Alloys and Nickel Alloys Editi.pdf

1、AECMA PREN*2L33 95 LOL23LL 0009953 913 M I I aecma 1995 AECMA STANDARD NORME AECMA AECMA NORM l prEN 2133 Edition 2 November 1995 Edition aooroved PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledeiie 94 - 8-1200 BRUXELLES - Tel. (32) 2 775 81 10 - Fax. (32) 2 775 81 11 Su

2、persedes edition 1 ICs : 49.040.40 June 1981 The eauivalent versions in French and German lanauaaes Descriptors : for publication 1995-1 1-30 ENGLISH VERSION - can be supplied by B.N.A.E. - Technopoiis 54 - ISS, rue Jean-Jacques Rousseau 921 38 ISSY - LES - MOULINEAUX CEDEX - FRANCE Aerospace series

3、 Cadmium plating of steels, with maximum specified tensile strength equal to or less than 1 450 MPa, copper, copper alloys and nickel alloys Srie arospatiale Cadmiage lectrolytique des aciers, de rsistance infrieure ou gale 1 450 MPa, du cuivre, des alliages de cuivre et des alliages de nickel Luft-

4、 und Raumfahrt Verkadmen von Sthlen, mit einer hchstzulssigen Zugfestigkeit von 1 450 MPa, von Kupfer, von Kupferlegierungen und von Nickellegierungen This “Aerospace series“ Standard has been drawn up under the responsibility of AECMA (The European Asso cia tion of Aerospace Industries). It is publ

5、ished on yellow paper in three equivalent versions (English, French, German). It will be submitted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling Ser

6、vices AECMA PREN*ZL33 95 U LOL23LL 0009%55 796 M Page 3 EN 2133 : 1995 1 Scope This standard specifies the electrolytic cadmium plating of parts in steels of tensile strength , (max.) I 1 450 MPa, copper, copper alloys and nickel alloys, the temperature in service of which does not exceed 235 OC. Th

7、is standard is applicable whenever referenced. 2 Normatives references This European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated

8、 references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. IS0 1463 IS0 2082 IS0 2177 IS0 2178 IS0 2819 IS0 28

9、59-1 IS0 4520 IS0 9227 EN 2000 EN 2828 EN 2831 EN 2832 Metallic and oxide coatings - Measurement of coating thickness - Microscopical method Metallic coatings - Electroplated coatings of cadmium on iron or steel Metallic coatings - Measurement of coating thickness - Coulometric method by anodic diss

10、olution Non-magnetic coatings on magnetic substrates - Measurement of coating thickness - Magnetic method Metallic coatings on metallic substrates - Electrodeposited and chemically deposited coatings - Review of methods available for testing adhesion Sampling procedures for inspection by attributes

11、- Part 1 : Sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection Chromate conversion coatings on electroplated zinc and cadmium coatings Corrosion tests in artificial atmospheres - Salt spray tests Aerospace series - Quality assurance - EN aerospace products - Approval o

12、f the quality system of manufacturers Aerospace series - Adhesion test for metallic coatings by burnishing Aerospace series - Hydrogen embrittlement of steels - Test by slow bending Aerospace series - Hydrogen embrittlement of steels - Notched specimen test 3 Purpose of process To ensure protection

13、against corrosion or to reduce the effects of the galvanic coupling when assembling different materials, e.g. steel, aluminium or magnesium. 4 Limitations of process use The contact of cadmium-plated parts with titanium, titanium alloys, fuels and fuel lines : - is to be avoided at temperatures 1 10

14、0 and I1 450 Carburized parts 5.1 Batch : Unless otherwise specified, it comprises parts of the same nature (form, size, material), treated at the same time in the same bath. Not necessary 190 OC to 230 OC min. 1 h 130 OC to 150 OC min. 6 h 5.2 Pre-production parts : Parts representing future produc

15、tion. 6 Thickness Unless otherwise specified in the product standard or definition document, the thicknesses are : - Class A : 10 pm to 20 pm ; - Class B : 5 pm to 14 pm ; - Class C : 5 pm to 10 pm ; NOTE : These thicknesses are those of the cadmium coating alone ; the nickel strike thicknesses are

16、considered negligible. 7 Symbols R, (max.) : Maximum specified tensile strength 8 Information for the processor - Designation, see 17 ; - number of the substrate standard and metallurgical condition of the substrate ; - areas to be coated ; - thickness measuring points ; - time and temperature of he

17、at treatment before and after processing ; - electrical contact points or areas where these are prohibited ; - requirements for finishing operations other than chromating, e.g. phosphating, etc. (see 11.2). 9 Condition of parts prior to processing Welding, brazing, mechanical operations and heat tre

18、atments shall be completed. Unless otherwise specified, the stress relief heat treatment conditions for parts in steel shall conform to table 1. Table 1 A slight coloration by superficial oxidation is permitted. When shot peening is specified, it shall be performed after the stress relief operations

19、. COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling ServicesPage 5 EN 2133 : 1995 Temperature 1) OC Substrate 10 Process schedule Unless otherwise specified, see annex A. 1 O. 1 Surface preparation See annex B. 10.2 Nickel strike Applicable to co

20、rrosion resisting steels, copper and copper alloys, nickel and nickel alloys. Minimum time 1) h See annex C. 10.3 Cadmium plating See annex D. 11 Post-treatment 11.1 De-embrittlement It shall be carried out within 4 h after cadmium pl I Steels 1 100 MPa m (max.) I 1 450 MPa 190 to 230 ting, ac Table

21、 2 8 ording to table 2. Other materials not required I Carburized parts I 130 to 150 I 8 I 11.2 Chromating Unless otherwise specified, chromating shall be applied. It shall be carried out after de-embrittlement, in accordance with IS0 4520, type B (yellow), class 2C. 12 Removal of the plating The so

22、lution used shall not attack the base metal. EXAMPLE : Immersion of parts in a solution of ammonium nitrate (e.g. 100 g/l to 300 g/l at ambient temperature for approx. 10 min). After removal of the plating, parts shall be de-embrittled in accordance with table 2. 13 Required characteristics 13.1 App

23、earance The surface shall be satin, uniform and, free from : - rough, burnt or powdery areas ; - pits ; - exfoliations ; - blisters. In the case of chromate coating, the surface shall be of an iridescent, gold or brass colour. COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLi

24、censed by Information Handling ServicesPage 6 EN 2133 : 1995 13.2 Adhesion See 14.1.2. 13.3 Thickness See 6. 13.4 Composition of the plating Unless otherwise specified, it shall contain at least 99,9 % cadmium and less than 0,004 % mercury. 13.5 Hydrogen embrittlement of steels Unless otherwise spec

25、ified, these tests are applicable to steels with a tensile strength of Rm 2 1 100 MPa. - No rupture within 200 h (for EN 2832) - final ductility 2 94 % of the initial ductility (for EN 2831). or 13.6 Corrosion resistance After exposure to salt spray : - for chrornated cadmium-plated parts, white cad

26、mium salts shall not appear within 96 h and corrosion of the substrate not within 336 h ; - for non-chromated cadmium-plated parts, corrosion shall not appear within 240 h. 14 Test methods 14.1 For process approval 14.1.1 Appearance Visual inspection 14. I .2 Adhesion See EN 2828 or IS0 2819 (cross-

27、cut test) 14.1.3 Thickness See IS0 1463, IS0 2082, IS0 21 77 and IS0 21 78 The choice of the method shall be subject to an agreement between the processor and the purchaser. In case of dispute, the method defined in IS0 1463 is the reference method. 14.1.4 Composition of the plating The method of an

28、alysis shall be agreed between the processor and the purchaser. 14.1.5 Hydrogen embrittlement See EN 2832 and EN 2831 The choice of the method shall be subject to an agreement between the processor and the purchaser. Upon agreement from the purchaser, the tensile strength of the specimens may differ

29、 from the parts to be treated and from Rm 2 1 450 MPa. Other methods may be used subject to the purchasers agreement. COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling ServicesAECMA PRENx2133 95 1012311 O009959 331 = Page 7 EN 2133 : 1995 14.1.6

30、Corrosion resistance IS0 9227, in a 5 % solution of sodium chloride, on the following test pieces a) Material Annealed steel with a carbon content of between 0,l % and 0,18 % b) Minimum dimensions Thickness : not specified Length : 120 mm Width : 60 mm c) Thickness of the plating 10 pm to 15 pm 14.2

31、 For acceptance of parts 14.2.1 Appearance See 14.1.1. 14.2.2 Adhesion See 14.1.2. 14.2.3 Thickness Steel : see IS0 2178 Copper, copper alloys and nickel alloys : as agreed between the processor and the purchaser. 14.2.4 Other tests Tests other than those specified in 14.1 may be carried out after a

32、greement between the processor and the purchaser. 15 Quality assurance 15.1 Approval of the processor See EN 2000. 15.2 Process approval The processor shall carry out : - the plating on pre-production parts and/or test pieces determined by agreement between the processor and the purchaser ; - the te

33、sts specified in this standard, unless otherwise agreed between the processor and the purchaser. When the test results have been recognized as satisfactory by the purchaser, he shall give his written approval to start production. The process schedule shall not be changed without previous agreement f

34、rom the purchaser. 15.3 Acceptance During production, the tests may be carried out on parts and/or test pieces coated under the same conditions as the parts. The visual inspection (see 14.2.1) shall be performed on the whole batch, unless otherwise specified. Unless otherwise specified, the adhesion

35、 tests (see 14.2.2) shall be carried out at a rate of one part or one test piece per batch. COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling Services AECMA PRENx2L33 95 LOL23LL 0009960 053 Number of this standard I- Page 8 EN 2133 : 1995 Unless

36、otherwise specified, the thickness (see 14.2.3) shall be measured by sampling in accordance with IS0 2859-1 : - code letter of the sample size, table 1, special inspection level S3 ; - simple sampling plan for tightened inspection ; - acceptable quality level (AQL) 1,5. The frequency and nature of t

37、he other tests (see 14.2.4) shall be determined by agreement between the purchaser and the processor. 15.4 Reprocessing Reworking of parts not meeting the requirements is not permitted. Upon agreement from the purchaser, the parts not meeting the requirfments may be reprocessed (see 10 and 12). 16 H

38、ealth, safety and environmental aspects National laws and legal provisions shall be respected. 17 Designation EXAMPLE : Thickness class (see 6) I COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling ServicesSubstrate Methods Steels with R, (max.) 5

39、1 100 MPa Steels with 1 100 MPa , (max.) 1 450 MPa Corros i on resisting steels Copper and copper alloys Nickel and nickel alloys Page 9 EN 2133 : 1995 Annex A (normative) Process schedule for cadmium plating of metallic materials Sequence of operations Surface preparation I I x : to be carried out

40、1) The choice of the method shall be determined by agreement between the processor and the purchaser, and a process schedule shall be prepared. COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling ServicesAnnex B (normative) Surface preparation B. 1

41、 General The methods are given for guidance and are not restrictive ; any other method giving at least equivalent results may be applied. The choice of the method shall be subject to agreement between the processor and the purchaser and the process schedule (see annex A) shall indicate this method.

42、B.2 Degreasing B.2.1 They shall be used when hot or cold in liquid or vapour state. Method A : Organic solvents B.2.2 Alkaline solutions a) Method B1 : Degreasing in strong alkaline solutions The composition may be as follows : - caustic soda : 15 g/l - sodium metasilicate pentahydrate : 40 g/l b) M

43、ethod B2 : Degreasing in mild alkaline solutions The composition may be as follows : - sodium metasilicate pentahydrate : 25 g/l - sodium carbonate : 25 g/l The addition of a wetting agent is possible. These solutions shall be used for immersion or anodically. B.2.3 Abrasive cleaning Method D1 : Cle

44、aning by dry coarse sand blasting, (usually grain 250 pm to 500 pm). Method O2 : Cleaning by fine abrasive blasting (grain 50 pm to 160 pm) Method D3 : Scouring This method is applied with wet pumice, alumina or any other non-metallic abrasive. Method D4 : Tumbling The abrasive used depends on the t

45、ype of material ; only parts of the same nature may be processed at the same time. B.3 Acid pickling B.3.1 Method FI : Sulphuric acid - Aqueous solution containing 90 g/l to 350 g/l sulphuric acid with or without inhibitors or wetting agents : temperature 60 OC to 85 OC. Inhibitors containing antimo

46、ny are prohibited. COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling Services AECMA PREN*ZL33 95 LOL23LL 0009963 b2 Page 11 EN 2133 : 1995 B.3.2 Method F2 : Hydrochloric acid - Aqueous solution containing 75 g/l to 280 g/l hydrochloric acid with

47、or without inhibitors or wetting agents : ambient temperature. B.3.3 Etching of nickel and nickel alloys Aqueous solution of one of the following compositions : 8.3.3.1 Method TI : - Hydrofluoric acid - Nitric acid Temperature of the solution 65 OC : 23 g/l : min. 175 g/l 8.3.3.2 Method T2 : - Hydro

48、fluoric acid : 57 g/l - Iron sulphate : 190 g/l Preferably use iron sulphate liquor containing 640 g/l of iron sulphate Fe2 Temperature of the solution 65 OC to 70 OC. 9 H201. 8.3.4 Method O : Pickling of copper and copper alloys in the following solution : - Sodium dichromate - Sulphuric acid : 200

49、 g/l nominal : 70 g/l nominal B.3.5 Method R : Descaling of copper and copper alloys in the following solution : - Sulphuric acid - Temperature : 180 g/l nominal : 25 OC to 50 OC. B.4 Anodic electrolytic etching B.4.1 Method HI The aqueous solution nominally contains 530 g/l of sulphuric acid used at a current density of more than 10 A/dm2, (4 V to 8 V) and preferably 20 A/dm2, at a temperature of approx. 25 OC. A temperature of approx. 70 OC may be used to remove oxides. B.4.2 Method H2 The aqueous solution nominally contains 750 g/l of sulphuric acid used at