1、METRIC MIL-STD-868B(USAF) w/CHANGE 2 28 April 2009 SUPERSEDES MIL-STD-868B w/CHANGE 1 17 July 2008 DEPARTMENT OF DEFENSE STANDARD PRACTICE NICKEL PLATING, LOW ENBRITTLEMENT, ELECTRO-DESPOSITION This document is inactive for new design. AMSC: N/A AREA: MFFP Provided by IHSNot for ResaleNo reproductio
2、n or networking permitted without license from IHS-,-,-MIL-STD-868B CHANGE 2 FOREWORD 1. This Military Standard is approved for use by 309MXSG/MXR, Department of the Air Force and is available for use by all departments and agencies of the Department of Defense. 2. This standard provides guidance fo
3、r the Air Force repair process, acquisition, and manufacture of parts and/or spare parts on the landing gear of all military aircraft. 3. Beneficial comments, recommendations, additions, deletions, clarifications, etc. and any data that may improve this document should be sent to: 309MXSG/MXRL, Hill
4、 AFB, UT 84056-2609 or e-mailed to: 309MXSG/MXRLhill.af.mil. Since contact information can change, verification of currency of this address information through ASSIST Online database at http:/assist.daps.dla.mil. II Provided by IHSNot for ResaleNo reproduction or networking permitted without license
5、 from IHS-,-,-MIL-STD-868B CHANGE 2 CONTENTS PARAGRAPH PAGE FOREWORD ii 1. 1.1 1.2 1.2.1 1.2.2 2. 2.1 2.2 2.2.1 2.3 2.4 3. 3.1 3.2 4. 4.1 4.1.1 4.1.2 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 5. 5.1 5.1.1 5.1.2 5.1.3 5.1.4 5.1.5 5.1.7 5.2 5.3 5.3.1 SCOPE Scope Classification Classes Tvoes APPLICABLE DOCU
6、MENTS General Government documents Specifications, standards, handbooks Non-Qovernment standards and publications Order of precedence DEFINITIONS Hiqh strenath steel Material batch GENERAL REQUIREMENTS Materials and eauipment Materials Equipment Specification SAE-AMS-QQ-N-290 Finish Shot oeenina Emb
7、rittlement Re-processinq Platina thickness Tvoe I platina Tvpe II platina Reclaimed materials DETAILED REQUIREMENTS General Prior to platina Bakina Storaae of parts Handlina of parts Masking Rackina Platina procedure Method 1 Steol 2 2 2 2 2 2 2 2 3 3 3 3 4 4 4 4 4 4 4 4 4 4 4 4 5 5 5 5 5 iii Provid
8、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-868B CHANGE 2 CONTENTS PARAGRAPH 5.3.2 5.3.3 5.3.4 5.3.5 5.3.6 5.3.7 5.4 5.4.1 5.4.2 5.4.3 5.4.4 5.4.5 5.4.5.1 5.4.6 5.4.7 5.4.8 5.4.9 5.4.10 5.4.11 5.5 5.6 5.7 5.7.1 5.8 5.8.1 5.9 6. 6.1 6.2 6.3 Step
9、 2 Step 3 Step 4 Step 5 Step 6 Step 7 Method 2 Steol Step 2 Step 3 Step 4 Step 5 Alternate Step 5 Step 6 Step 7 Step 8 Step 9 Step 10 Step 11 Inspection Process controls Qualification embrittlement test Analysis report Process control embrittlement acceptance test Hvdroaen detection instrument testi
10、na Safetv and health NOTES Intended use Subject term fkev word) listina Chanaes from previous issues CONCLUDING MATERIALS PAGE 5 5 5 6 6 6 6 6 6 6 6 6 6 7 7 7 7 7 7 7 7 7 8 8 8 8 8 8 8 9 9 IV Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-86
11、8B CHANGE 2 SUMMARY OF CHANGE 2 MODIFICATIONS Paragraph 2.3, Non-Government Standards & Specifications: Changed SAE-AMS-S-13165 with SAE-AMS-2430, Shot Peening. The following detail requirement of MIL-STD-868B has been revised, paragraph 5.3.2, Step Number 2: New Requirement: Parts shall be dry blas
12、ted using 80 - 320 grit aluminum (Al203), silicon dioxide (Si02), or garnet per MIL-STD-1504. Elapsed time between completion of cleaning and the next step shall not exceed four (4) hours. Old Requirement: Parts shall be dry blasted using 80 - 320 grit aluminum (Al203), silicon dioxide (Si02), or ga
13、rnet per MIL-STD-1504. Elapsed time between completion of cleaning and the next step shall not exceed sixty minutes. Reworded paragraph 1.2.2 and took shall out. Removed “plating“ from paragraph 6.2, “Subject terms “key words“ listing“ and added “MethodsTProcedures.“ v Provided by IHSNot for ResaleN
14、o reproduction or networking permitted without license from IHS-,-,-MJL-STD-868B CHANGE 2 SUMMARY OF CHANGE 1 MODIFICATIONS The following detail requirement of MIL-STD-868B has been revised, paragraph 5.4.5.I.C: New Requirement: Operate at 60 to 75F, 3 to 6 amps per square inch anodic for 45 to 90 s
15、econds. Old Requirement: Operate at 60 to 75F, 3 to 6 amps per square foot anodic for 45 to 90 seconds. Deleted “plating“ from section 6.2, “Subject term “key words“ listing,“ with no replacement. VI Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MI
16、L-STD-868B CHANGE 2 1. SCOPE 1.1 Scope. This standard covers the process and materials required for the electro-deposition of nickel on high strength steel substrates. Electro-deposited nickel is used for wear resistance, heat resistance, and as an undercoat for precious metals. Subsequent heat trea
17、ting techniques needed to insure low hydrogen embrittlement of steel are also described. This standard meets the performance requirements of SAE-AMS-QQ-N-290 and may be used when SAE-AMS-QQ-N-290 is specified provided any unique requirements of SAE-AMS-QQ-N-290 are complied with. 1.2 Classification.
18、 1.2.1 Classes. Nickel plating covered by this standard will be of the engineering class only. | 12.2 Types. Nickel plating types identified in this standard are as follows: a. Type I - Plated to specified dimensions. b. Type II - Processed to specified dimensions after plating. 2. APPLICABLE DOCUME
19、NTS 2.1 General. The documents listed in this section are specified in sections 3, 4, and 5 of this standard. This section does not include documents cited in other sections of this standard or recommended for additional information or as examples. While every effort has been made to ensure the comp
20、leteness of this list, document users are cautioned that they must meet all specified requirements of the documents cited in sections 3, 4, and 5 of this standard, whether or not they are listed in this section. 2.2 Government documents. 2.2.1 Specifications, standards, handbooks and commercial item
21、 descriptions. The following specifications, standards, handbooks, and commercial item descriptions form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. DEPARTMENT OF DEFENSE SPECIFICAT
22、IONS MIL-R-81841 Rotary Flap Peening of Metal Parts DEPARTMENT OF DEFENSE STANDARDS MIL-STD-866 Grinding of Chrome Plated Steel and (inactive) Steel Parts Heat Treated to 180,000 psi or over MIL-STD-871 Electro-Chemical Stripping of Inorganic (inactive) Finishes 1 Provided by IHSNot for ResaleNo rep
23、roduction or networking permitted without license from IHS-,-,-MIL-STD-868B CHANGE 2 MIL-STD-1504 Abrasive Blast of Aircraft Components (Inactive) (Copies of these documents are available online at http:/assist.daps.dla.mil or from Standardization Document Order Desk, 700 Robbins Avenue, Building 4D
24、, Philadelphia, PA 19111-5094.) 2.3 Non-Government standards and specifications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. SOCIETY OF AUTOMOTIVE ENGIN
25、EERS INTERNATIONAL (SAE) | SAE-AMS-2430 Shot Peening SAE-AMS-QQ-N-290 Nickel, Plating (Electrodeposited) (Copies of these documents are available online at www.sae.org or from the Society of Automotive Engineers International, 400 Commonwealth Drive, Warrendale, PA 15096-1001.) AMERICAN SOCIETY FOR
26、TESTING AND MATERIALS (ASTM) ASTM Standard F519 Mechanical Hydrogen Embrittlement Evaluation of Plating/Coating Processes And Service Environments (Copies of these documents are available at www.astm.org or ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959.)
27、2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. DEFINITIO
28、NS 3.1 High strength steel. For the purpose of this standard, high strength steel is defined as steel heat treated to 1.24 X 109 Pa (180,000 psi and above). 3.2 Material batch. All items processed at one time through the plating bath. 4. GENERAL REQUIREMENTS 4.1 Materials and equipment Materials and
29、 equipment used in nickel plating are as follows. 4.1.1 Materials. a. Boric acid 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-868B CHANGE 2 b. Nickel Chloride c. Nickel Sulfate d. Sulfamate Nickel Plating SN, Barrett Chemical Products Di
30、vision, Baltimore, MD or approved equivalent. 4.1.2 Equipment. a. Power source. Either generated or rectified DC current may be used. Ripple value shall not exceed 10 percent as measured by dividing the Root Mean Square of the AC voltage component by the DC voltage. This can best be measured by usin
31、g an RMS voltage meter and dividing this value by the DC voltage. These measurements are to be taken across the anode and cathode bus at the tank. b. Tanks. Tanks should be resistant to the operating temperature and the chemical environment. Tanks in which any electrolytic action takes place must be
32、 free of short circuits. c. Temperature control. Plating tanks to be operated at temperature other than room temperature shall be equipped with automatic temperature indicating and regulating devices. d. Instrumentation. An ammeter shall be placed in series with the plating tank cathode. The ammeter
33、 shall have sufficient shunts and switches to provide a full-scale reading equal to the maximum capacity of the power source and an accuracy of 10 percent of the current being measured. e. Blast equipment. A blast cabinet shall be located near the plating line. The size of the cabinet shall be adequ
34、ate to enclose the parts to be plated. Air lines shall be suitably trapped and filtered to prevent in-process contamination of the parts to be cleaned. f. Bake oven. An oven capable of baking parts at 191 14C (375 25T) shall be located near the plating line. The size of the oven shall be adequate to
35、 enclose the parts to be plated. The oven shall be equipped with temperature indicating, recording, and regulating devices. 4.2 Specification SAE-AMS-QQ-N-290. The requirements of SAE-AMS-QQ-N-290 shall be compiled with on all parts, in conjunction with those specified in this standard. If there is
36、a conflict between the two documents, the requirements of this standard shall govern. 4.3 Finish. The plated part shall have a finish that is smooth, continuous, homogeneous, adherent, and free from pits, blisters, nodules and any other indications of harmful defects. 4.4 Shot peening. All parts hal
37、l be shot peened in accordance with SAE-AMS-S13165 or MIL-R-81841 unless otherwise specified. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-868B CHANGE 2 4.5 Embrittlement. Qualification test specimens and process control test specimens s
38、hall be subjected to a sustained load test at 75 percent of the ultimate notched tensile strength. The specimens shall endure this sustained load for 200 hours minimum without failing or cracking. 4.6 Re-processing. Parts rejected for defective plating, requiring stripping and re-plating, shall incl
39、ude all of the pre-plating steps of this standard. Parts shall be stripped in accordance with MIL-STD-871. 4.7 Plating thickness. The plating thickness shall be as specified on the engineering drawing or other applicable directives. Unless otherwise specified the minimum thickness shall be 0.05mm (0
40、.002 inch) and the maximum thickness shall be 0.2mm (0.008 inch) on the finished parts. 4.8 Type I plating. For Type I plating, the item shall be plated to the dimension and surface finish specified on the drawing. The surface finish of the item before plating shall be equal to or better than the re
41、quired finish after plating. Type I plating may be buffed or lapped after plating if dimensional tolerances and surface conditions cannot be controlled in the plating operation. 4.9 Type II plating. For Type II plating a minimum of 0.05mm (0.002 inch) more nickel than desired shall be deposited (per
42、 surface). The excess shall be ground off to give the final dimension and surface finish desired. The minimum thickness for Type II shall be 0.05mm (0.002 inch) on the finished part. Steel parts heat treated to 1240 MPa (112 kg/mm2) (180,000 psi) shall be ground in accordance with MIL-STD-866. 4.10
43、Reclaimed materials. Reclaimed materials shall be utilized to the maximum extent possible with the quality limits required by this document and to fulfill compliance with the Resource Conservation/Recovery Act of 1976 (Public law 94-580, 21 October 1976). 5. DETAILED REQUIREMENTS 5.1 General. The in
44、formation contained in this section provides the process and procedures to follow when performing the plating process. 5.1.1 Prior to plating. Prior to plating, except for finish grinding operations, all machining, forming, welding, and shot peening shall be completed. 5.1.2 Baking. Parts shall be b
45、aked for stress relief before plating for four hours minimum at 191 14C (375 25T). Shot peening shall be performed before plating and after stress relieving. 5.1.3 Storage of parts. Storage of parts between stress relief and cleaning shall be controlled to prevent contact with water or other corrosi
46、ve materials. Parts shall be stored to permit free circulation of air around the parts. 5.1.4 Handling of parts. After the parts have been cleaned, they shall be handled in such a manner (white gloves, etc) that will ensure a minimum of contamination. 4 Provided by IHSNot for ResaleNo reproduction o
47、r networking permitted without license from IHS-,-,-MIL-STD-868B CHANGE 2 5.1.5 Masking. Sections or areas of a part that are not to be plated shall be masked off. Plug and masking materials that do not contaminate the plating solution shall be used. Masking shall be performed at the most convenient
48、 step prior to plating. 5.1.6 Racking. Sufficient contact area and pressure shall be provided to carry the current without overheating. Racking should be performed at the most convenient step prior to plating. 5.2 Plating procedure. The preferred method of cleaning is by dry blasting (Method I). Other methods, such as Method 2, that can be demonstrated to be non-embrittling (paragraph 5.7) can be used with the approval of the procuring activity. 5.3 Method I. The nickel plating procedure shall be as described below: 5.3.1 Step 1. Parts shall be degreased as necessary. 5.3.2 Step 2. Pa
