SAE AMS 03-14-2015 Electrodeposition of Chromium for Engineering Purposes.pdf
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1、AEROSPACE MATERIAL SPECIFICATION AMS03-14 Issued 2015-04 Electrodeposition of Chromium for Engineering Purposes RATIONALE This Standard is a direct replacement for DEF STAN 03-14 and has been reproduced by SAE International under the Open Government Licensing Agreement. The technical content remains
2、 unchanged from Issue 4 of the Defence Standard it supersedes. Any queries should be referred via the link shown in the feedback box at the bottom of this page. LICENSING AGREEMENT Ministry of Defence. Crown Copyright 2015. Reproduced under the terms of the Open Government License. FOREWORD REVISION
3、 NOTE This Defence Standard was raised to Issue 4 to update its content and incorporate the latest MoD/DStan policy in place at the time. HISTORICAL RECORD This standard supersedes the following: Def Stan 03-14 Issue 1, August 1979 Def Stan 03-14 Issue 2, February 1995 Def Stan 03-14 Issue 3, Februa
4、ry 2005 Def Stan 03-31 Issue 1, April 1993 Def Stan 02-870 Issue 1, April 2000 Def Stan 02-870 Issue 2, August 2004 _ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely volu
5、ntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE in
6、vites your written comments and suggestions. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report,
7、 please visit http:/www.sae.org/technical/standards/AMS03_14 SAE INTERNATIONAL AMS03-14 Page 2 of 28 TABLE OF CONTENTS 1. SCOPE 4 2. WARNING . 4 3. NORMATIVE REFERENCES . 4 4. ABBREVIATIONS . 5 5. DEFINITIONS . 6 6. INFORMATION TO BE SUPPLIED TO THE PROCESSOR 6 7. PROCESS CONTROL 7 8. CONDITION OF S
8、UBSTRATE . 7 9. CHROMIUM ELECTRODEPOSITION PROCESS . 7 10. RECLAMATION OF WORN OR OVER-MACHINED ITEMS . 8 11. DIMENSIONAL TOLERANCES 8 12. THICKNESS OF ELECTRODEPOSIT AFTER FINAL FINISHING 8 13. MACHINING AND GRINDING 8 14. GENERAL . 9 15. STRESS RELIEF 9 16. INTRODUCTION OF SURFACE COMPRESSIVE STRE
9、SSES 9 17. PREPARATION FOR ELECTRODEPOSITION . 10 17.1 Initial Cleaning . 10 17.2 Masking . 10 17.3 Application of Undercoats . 10 17.4 Final Cleaning . 10 17.5 Etching 10 17.5.1 Non-Corrosion Resisting Steel 10 17.5.2 Corrosion Resisting Steel (e.g., stainless steels) . 10 17.5.3 Cast Iron 11 17.5.
10、4 Nickel Electrodeposit on Steel 11 17.6 Rinsing 11 18. ELECTRODEPOSITION OF CHROMIUM 11 19. POST-ELECTRODEPOSITION HEAT TREATMENT 11 20. GENERAL . 13 21. PREPARATION FOR ELECTRODEPOSITION . 13 22. ELECTRODEPOSITION OF CHROMIUM 13 23. POST-ELECTRODEPOSITION HEAT TREATMENT 13 24. GENERAL . 13 SAE INT
11、ERNATIONAL AMS03-14 Page 3 of 28 25. PREPARATION FOR ELECTRODEPOSITION . 14 26. ELECTRODEPOSITION OF CHROMIUM 14 27. POST-ELECTRODEPOSITION HEAT TREATMENT 14 28. GENERAL . 14 29. PREPARATION FOR ELECTRODEPOSITION . 14 30. ELECTRODEPOSITION OF CHROMIUM 14 31. ELECTRODEPOSITION OF CHROMIUM ON CHROMIUM
12、 14 32. INSPECTION AND TESTING . 15 33. VISUAL INSPECTION 15 34. THICKNESS OF COATING 15 35. HARDNESS 15 36. ADHESION . 16 37. FREEDOM FROM EMBRITTLEMENT . 16 38. CORROSION TESTING . 17 39. OTHER REQUIREMENTS 17 40. TREATMENT OF ITEMS REJECTED DURING FINAL INSPECTION AND TEST . 17 41. NOTES 17 ANNEX
13、 A GUIDANCE ON CHROMIUM ELECTRODEPOSITION FOR ENGINEERING PURPOSES . 18 ANNEX B CHROMIUM ELECTRODEPOSITION PROCESS . 23 ANNEX C THE ANALYSIS OF CHROMIUM ELECTRODEPOSITION SOLUTION . 24 ANNEX D POST-ELECTRODEPOSITION TREATMENT FOR FERROUS METALS 26 ANNEX E CHEMICAL METHODS OF STRIPPING CHROMIUM DEPOS
14、ITS . 27 ANNEX F ADHESION TESTS . 28 Table 1 Specified minimum/maximum tensile strengths of steels . 6 Table 2 Stress relief before electrodeposition (based on recommendations in BS ISO 9587) . 9 Table 3 Introduction of surface compressive stresses . 9 Table 4 Post-electrodeposition heat treatment o
15、f high-strength steels (based on recommendations in BS ISO 9588) 12 Table 5 Maximum Load versus coating thickness for hardness testing of chromium electrodeposits 16 SAE INTERNATIONAL AMS03-14 Page 4 of 28 SECTION 1 INTRODUCTION OVERVIEW This standard is concerned with the electrodeposition of chrom
16、ium on ferrous metals, aluminum and aluminum alloys, titanium and titanium alloys and other metals for one or more of the following purposes: The production of wear-resistant surfaces. Wear resistance coupled with corrosion resistance. The reclamation of engineering components. This Standard represe
17、nts a “compositing” and replacement of three previous Standards, AMS03-14/Def Stan 03-14 Issue 3, Def Stan 03-31 Issue 1 and Def Stan 02-870 Issue 2. For technical and economic reasons, early and close liaison between designers, manufacturers, electrodepositors and inspectors is essential. As it is
18、virtually impossible to test the adhesion of chromium coatings in a non-destructive manner, integrity of workmanship is especially important and there is clear need for careful control at each stage of processing - including visual inspection for cleanliness of the surface immediately before electro
19、deposition. TYPES OF CHROMIUM COATINGS The character of a chromium plate (e.g., hardness, crack pattern) can vary substantially depending largely on the chemistry of the electrodeposition bath. For instance, the presence of cracks in hard chromium coating is essentially an inherent feature of the pr
20、ocess but the detailed crack pattern (and linked properties such as hardness, wear resistance and corrosion behavior) is very much dependent upon the process chemistry. The background and guidelines relating to the various types of hard chromium processes are presented in Annex A. SECTION 2 GENERAL
21、REQUIREMENTS 1. SCOPE This SAE Standard gives guidance for - and specifies the requirements for - the electrodeposition of chromium for engineering purposes. It relates to both new articles and also the reclamation of worn or over-machined components. Chromium electrodeposition undertaken for decora
22、tive purposes is not considered herein. 2. WARNING This section which appeared in DEF STAN 03-14 Issue 4 has been deliberately deleted. 3. NORMATIVE REFERENCES 3.1 The publications shown below are referred to in the text of this standard. Publications are grouped and listed in alpha-numeric order. D
23、ef Stan 03-2 Cleaning and preparation of metal surfaces AMS03-2 Cleaning and preparation of metal surfaces Def Stan 03-4 The pre-treatment and protection of steel items of maximum tensile strength exceeding 1450 MPa AMS03-4 The pre-treatment and protection of steel items of maximum tensile strength
24、exceeding 1450 MPa Def Stan 03-21 Mechanical methods for the inducement of compressive surface residual stresses Def Stan 03-24 Chromic acid anodising of aluminium and aluminium alloys SAE INTERNATIONAL AMS03-14 Page 5 of 28 Def Stan 03-25 Sulphuric acid anodising of aluminium and aluminium alloys A
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