ASD-STAN PREN 3765-1997 Aerospace Series Electrolytic Silver Plating for General Use Steels Heat Resisting Alloys Copper and Copper Alloys (Edition P1)《航空航天系列 通用钢、耐热合金、铜和铜合金用电解镀银 第.pdf
《ASD-STAN PREN 3765-1997 Aerospace Series Electrolytic Silver Plating for General Use Steels Heat Resisting Alloys Copper and Copper Alloys (Edition P1)《航空航天系列 通用钢、耐热合金、铜和铜合金用电解镀银 第.pdf》由会员分享,可在线阅读,更多相关《ASD-STAN PREN 3765-1997 Aerospace Series Electrolytic Silver Plating for General Use Steels Heat Resisting Alloys Copper and Copper Alloys (Edition P1)《航空航天系列 通用钢、耐热合金、铜和铜合金用电解镀银 第.pdf(12页珍藏版)》请在麦多课文档分享上搜索。
1、AECMA STANDARD NORME AECMA AECMA NORM prEN 3765 Edition P 1 April 1997 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - 8-1200 BRUXELLES - Tel. (32) 2 775 81 10 - Fax. (32) 2 775 81 11 ICs : Descriptors : ENGLISH VERSION Aerospace series Electrolytic silver plati
2、ng for general use Steels, heat resisting alloys, copper and copper alloys Srie arospatiale Luft- und Raumfahrt Argentage lectrolytique pour usage gnral Aciers, alliages rsistant chaud, cuivre et alliages de cuivre Elektrolytisches Versilbern fr allgemeinen Gebrauch hochwarmfeste Sthle, Legierungen
3、Kupfer und Kupferlegierungen This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (The European Association of Aerospace Industries). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concerned Tec
4、hnical Committee following comment by the Member countries. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and sig
5、nature of the AECMA Standard Checking Centre (NPS) and formal agreement of the Official Services of the Member countries it will be submitted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. Nota - Extra copies can be supplied by B.N.A.E. - Technopolis 54
6、 - 199, rue Jean-Jacques Rousseau - 921 38 ISSY-LES-MOULINEAUX CEDEX Edition approved for publication 1997-04-30 Comments should be sent within six months after the date of publication to AECMA Gulledeiie 94 B-1200 BRUXELLES C7 Chairman Mr Wright aecma 199; STD*AECMA PREN 37b5-ENGL 1777 W L03231L 00
7、32773 277 Page 3 prEN 3765 : 1997 1 Scope This standard defines the electrolytic silver plating of steels, heat resisting alloys, copper and copper alloys used in aerospace construction. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other pu
8、blications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revi
9、sion. For undated references the latest edition of the publication referred to applies. IS0 1463 IS0 2177 IS0 2859-1 IS0 3882 EN 2000 EN 2828 EN 2829 EN 2830 EN 2831 EN 2832 Metallic and oxide coatings - Measurement of coating thickness - Microscopical method Metallic coatings - Measurement of coati
10、ng thickness - Coulometric method by anodic dissolution Sampling procedures for inspection by attributes - Part 1 : Sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection Metallic and other non-organic coatings - Review of methods of measurements of thickness Aerospace se
11、ries - Quality assurance - EN aerospace products - Approval of the quality system of manufacturers Aerospace series - Adhesion test for metallic coatings by burnishing Aerospace series - Adhesion test for metallic coatings by shot peening Aerospace series - Adhesion test for metallic coatings by she
12、aring action Aerospace series - Hydrogen embrittlement of steels - Test by slow bending Aerospace series - Hydrogen embrittlement of steels - Notched specimen test 3 Purpose of process To prevent fretting or seizure. 4 Definitions For the purposes of this standard, the following definitions apply Ba
13、tch : Unless otherwise specified, it comprises parts of the same nature (shape, size, material) treated at the same time in the same bath and after having undergone the same pre-treatment and post-treatment. Ra : Surface condition - Arithmetic mean deviation of roughness, expressed in pm. Rm(max.) :
14、 Maximum specified tensile strength. STD-AECMA PREN 37b5-ENGL 11997 E LDL23bL 00112974 LU5 E Page 4 prEN 3765 : 1997 5 Classification of coatings 5.1 Type A Electrodeposit of silver, on a nickel strike with or without an undercoat of nickel, applied to parts which may reach 760 OC in continuous oper
15、ation. 5.2 Type B Electrodeposit of silver, on a copper undercoat, applied to parts which may reach a maximum of 150 OC in continuous operation. 6 Information for the processor In addition to the designation (see 151, the following information shall be given : the reference of the substrate standard
16、 and the metallurgical condition of the substrate ; the areas to be treated ; the duration and temperature of heat treatments before and after processing ; the electrical contact points or the areas where these are prohibited ; the surface of the part in dm2 ; if required, the mechanical finishing.
17、Condition of parts prior to processing Manufacturing process All welding, brazing, heat treatments including stress relief and machining operations, with the exception of those possibly performed on the coating, shall have been completed before coating. The stress relief heat treatment conditions sh
18、all be determined according to the nature and the strength of the material. Stress relief treatment of nickel and copper alloys is not required. A slight discoloration by superficial oxidation is permitted. 7.2 Surface roughness Unless otherwise specified the functional areas of the part to be coate
19、d shall have : Ra 1450 MPa Steels with R, (max.) I 1450 MPa Case hardened steels and other materials Type A 1) . Minimum Time 18 h 2h 5h Substrate I Type - Steels with 1 1 O0 I R, (max.) I 1450 MPa Steels with R, (max.) 1450 MPa B I Other materials see annex C 3 see annex D 4 3 A Heat resisting stee
20、ls and heat resisting alloys 2 4 3 2 3 2 3 3 Copper and I I 1 copper alloys 1 2 _ _ _ 1) Applies exclusively to parts not exposed to corrosion (e.g. parts inside sealed casing) 9 Post-treatment It shall be carried out within 24 h of coating, unless otherwise stated in the design document, in accorda
21、nce with table 2 : 130 - 150 5hto12h 130 - 150 24 h 130 - 150 Ih 1) Parts may be heat treated for a shorter time at a higher temperature if the conditions have been shown to be effective in reducing hydrogen embrittlement and do not affect the performance of the part. 10 Removal of the silver platin
22、g The solution shall not attack the base metal (example for steel : an aqueous solution of nitrobenzene sulphonate sodium salt 55 g/l to 65 g/l and sodium cyanide 90 g/l to 100 g/l, temperature 30 OC to 70 OC). 11 Required characteristics 1 1.1 Appearance The coating shall have a smooth, adherent, s
23、atin and uniform appearance, free from : - cracks ; - rough, burnt or excessive build-up ; - uncoated areas ; - pitting ; - blisters, pores or exfoliation. Some slight variation in brilliance, due to the geometry of the part is accepted. 11.2 Adhesion The deposit shall adhere to the whole surface. T
24、he deposit shall satisfy the test in 12.1 .I and 12.2.3. 11.3 Thickness Unless otherwise specified in the design document, the thickness of the silver, including any strike treatments, shall be (8 f 2) ym and the thickness of any undercoat shall be 3 ym to 10 pm. 1 1.4 Composition of the deposit Unl
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