1、DOD-STD-2182 UF m 79777LL 0088289 O m 4 -13 -22 e 29 January 1985 SUPERSEDING NAVSEA 0919-LP-000-9010 January 1967 MILITARY STANDARD ENGINEERING CHROMIUM PLATING (ELECTRODEPOSITED) FOR REPAIR OF SHAFTING (METRIC) NO DELIVERABLE DATA REQUIRED BY THIS DOCUMENT AREA WFP THIS DOCUMENT CONTAINS -14 PAGES
2、 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. _ _. - DOD-STD-2182 MF 777771L 0088270 7 DOD-STD-2182(SH) 29 January 1985 DEPARTMENT OF THE NAVY NAVAL SEA SYSTENS COMFIAND Washington, DC 20362 Engineering.Chromium Plating (Electrodeposited) for Re
3、pair of Shafting (METRIC ) DOD-STD-2182(SH) 1. Command, Department of the Navy, and is available for use by all Depar.tments and Agencies of the Department of Defense. 2. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document
4、 should be addressed to: Commander, Kaval Sea Systems Command, SEA 5523, Department of the Navy, Washington, DC 20362 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. This Military Standard is approved for us
5、e by the Naval Sea Systems .- - ii Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-STD-2182(SH) 29 January 1985 FOREWORD 1. ment of shafting. This Military Standard provides instruction for the repair and refurbish- 2. Industrial chromium or hard
6、 chromium is used for wear resistance, abrasion resistance and such incidental corrosion protection of parts as the specified thickness of the plating may afford. t iii Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_ - -_ - . - _ - _ DOD-STD-2382 M
7、F = 7999733 0088272 O Paragraph 1. 1.1 2. 2.1 2.2 3. 4. 5. 5.1 5.1.1 5.1.2 5.1.3 5.1.4 5.1.5 5.2 5.3 5.3.1 5.3.2 5.4 5.4.1 5.4.2 5.5 5.6 5.6.1 5.6.2 5.6.3 5.6.4 5.6.5 5.6.6 5.6.7 5.6.8 5.6.9 5.6.10 5.6.11 5.6.12 5.7 5.8 5.8.1 5.8.2 5.8.3 5.8.4 5.8.4.1 CONTENTS Page 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 3
8、4 4 4 4 4 4 4 4 5 5 5 5 5 5 6 6 6 6 iv Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. DOD-STD-2182(SH) 29 January 1985 CONTENTS - Continued Page Paragraph 5.8.4.2 5.8.4.3 5.8.4.4 5.8.4.5 5.9 5.9.1 5.9.2 5.9.2.1 5.9.2.2 5.9.3 5.9.4 5.9.5 5.9.6 5.9.
9、7 APPENDIX v/vi Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD -STD - 2 182 (SH) 29 January 1985 1. SCOPE 1.1 Scope. This Military Standard establishes uniform standards for repair and refurbishment of shafting not subject to sea water service.
10、2. REFERENCED DOCUMENTS 2.1 Issues of documents. The following documents, of the issue in effect on date of invitation for bids or request for proposal, form a part of this standard to the extent specified herein. SPECIFICATIONS MILITARY MIL-S-851 - Steel Grit, Shot and Cut Wire Shot; and Iron Grit
11、and Shot - Blast Cleaning and Peening. MIL-S-5002 - Surface Treatments and Inorganic Coatings for Metal Surfaces of Weapons Systems. MIL-G-9954 - Glass Beads: For Cleaning and Peening. MIL-R-81841 - Rotary Flap Peening of Metal Parts. MIL-P-81985 - Peening of Metals. STANDARDS MILITARY MIL-STD-271 -
12、 Nondestructive Testing Requirements for Metals. (Copies of specifications and standards required by contractors in connec- tion with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting officer.) 2.2 Other publications. The following docu
13、ments form a part of this standard to the extent specified herein. Unless otherwise indicated, the issue in effect on date of invitation for bids or request for proposal shall apply * ASTM B 487 - Measurement of Metal and Oxide Coating Thickness by Microscopical Examination of a Cross Section. (DoD
14、adopted) Method: (DoD adopted) B 499 - Measurement of Coating Thickness by the Magnetic Nonmagnetic Coating on Magnetic Basis Metals. B 571 - Adhesion of Metallic Coatings. B 578 - Microhardness of Electroplated Coatings. B 630 - Preparation of Chromium for Electroplating with E 8 - Tension Testing
15、of Metallic Materials. (DoD adopted) Chromium. 1 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-STD-2182 MF M 7777711 0088275 b I- DOD- STD- 2 18 2 (SH) 29 January 1985 (Application for copies should be addressed to ASTM, 1916 Race Street, PhiIa
16、delphia, PA 19103.) (Technical society and technical association specifications and standards axe generally available for reference from libraries. huted among technical groups and using Federal agencies.) They are also distri- 3. DEFINITIONS Not applicable. 4. GENERAL REQUIREMENTS E Not app 1 icab
17、le. 5 DETAILED REQUIREWENTS 5.1 Mechanical pretreatment. Shafts for repair or refurbishment shall be prepared as specified in 5.1.1 through 5.1.5. 5.1.1 Blemish removal and reduction of shaft diameter. Slivers, burrs, grooves, pits, nicks and other surface blemishes in the area to be plated shall be
18、 completely removed, would result in excess reduction of the shaft dimension, may be repaired by brush-on application of nickel undercoat. reduction shall be uniform in diameter for its entire length except at fillets, and shall be concentric with the shaft axis. The final surface shall be free of g
19、rinding or heat checks. made in a manner to assure compliance with the plating thickness limitation specified in 5.6.3. The removal of randomly located pits or grooves, which Final removal of metal for diameter a Removal of metal in preparation for plating shall be 5.1.2 Length of reduced diameter s
20、ection. The length of reduced diameter section shall extend at least 3 millimeters (mm) (1/8 inch) beyond both ends of the bearing surface and where applicable, beyond the limits of carbon ring, labyrinth ring or packing gland in which the shaft will operate. at abrupt changes in shaft diameter or c
21、rank throws shall not be reduced or otherwise altered. Radius of curvature at ends of reduced diameter section, except at shaft shoulders shall be 0.5 mm (0.020 inch) minimum. The fillets 5.1.3 Crankshaft fillet. The diameter of any crankshaft bearing surface shall not be reduced within 1.5 mm (1/16
22、 inch) of fillet, (tangent point). Ends of reduced diameter sections of crankshafts shall be chamfered to approxi- mately 45 degrees. Grinding wheels used for reducing diameter shall be dressed to corner radius of not less than 0.8 mm (1/32 inch). 5.1.4 Keyways and shaft shoulders. If a part which h
23、as to be built up contains a keyway which is worn oversize, the keyway shall be reconditioned prim to surface preparation for the plating build-up. Sharp edges of keyways and shaft shoulders shall be removed by beveling with a hand stone or portable grinder. The fillet radius at the shoulder and red
24、uced diameter section shall be not less than 0.8 mm (1/32 inch). The boundaries of areas to be plated and adjoining areas shall be blended by buffing or polishing. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-STD-2182(SH) 29 January 1985 5.1
25、.5 Previously plated shaft. Unless otherwise specified in the contract or order (see 6.1), adherent deposit of chromium on shafts previously plated need not be removed. 5.2 Stress relief treatment. Steel shafts having an ultimate tensile strength of 1034 megapascals (MPa) (150 , O00 pounds per squar
26、e inch ( lb/in2) and above, which are machined or ground, shall be baked at 191 t 14 degrees Celsius (“C) (375 t 25 degrees Fahrenheit (OF) for 3 hours or more prior to cleaning and plating for the relief of damaging residual tensile stresses. shafts which have been cold straightened, stress relief
27、at a temperature 10 to 35OC (50 to 100F) below the tempering temperature for at least 1 hour per mm (inch) of thickness, but not less than 1 hour, is required. For 5.3 required) peened in Peening of shafts. After machining and stress relieving (when , and prior to plating, the area of the shaft to b
28、e plated shall be accordance with MIL-P-81985 or MIL-R-81841. Unless otherwise speci- fied in the contractor order (see 6.1), nitrided surface ,leed not be peened. However, where it is uncertain whether or not the nitride case has been cut or ground through, the area shall be peened. 5.3.1 Peening i
29、ntensity. The peening intensity for steel, titanium and aluminum shafts shall be in accordance with MIL-P-81985 or MIL-R-81841. The peening intensity for nickel or copper alloy shafts shall be the same as for aluminum shaft. 5.3.2 Peening material. Peening material shall be metallic shot in accordan
30、ce with MIL-S-851 as hardened cast steel (type I) for use on steel shafting. non-ferrous metal shafts. Glass bead in accordance with MIL-G-9954 shall be used for peening 5.4 Certification of shot peeners. 5.4.1 Operator certification. Prior to production peening, each peening operator shall be certi
31、fied in accordance with MIL-P-81985 using the equipment, materials and tools required for peening parts in production as well as by various production processes. 5.4.2 Record of certification. The peening facility shall complete and retain a record of the peening operators certification. 5.5 Inspect
32、ion prior to plating. Shafts to be plated shall be examined to assure freedom from injurious defects and damages which might adversely affect serviceability. Measurements shall be made to assure that straightness, indexing, parallelism, roundness, centering and other requirements, as appli- cable, a
33、re within the specified tolerances. The peened area, as well as fillets and other high stress areas, shall be liquid penetrant or magnetic particle inspected in accordance with MIL-STD-271 to assure that the shaft is free of cracks. the yoke method of magnetization. Magnetic particle inspection shal
34、l be performed by means of 5.6 Plating requirements. 5.6.1 Cleaning. After completion of all machining operations, heat treatment, peening and inspection, the shaft shall be cleaned in accordance 3 -a Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_
35、 - - - - DOD-STD-2382 MF 7797933 0088297 T DOD-STD-2182(SH) 29 January 1985 with MIL-S-5002. For materials not included in accordance with MIL-S-5002, cleaning shall be performed by methods which will not adversely affect the adhesion of the deposit. ASTM B 630 may be used for surface preparation of
36、 shafts which contain previously deposited chromium. 5.6.2 Underplating. The chromium shall be deposited directly on the surface of the shaft without application of a metallic undercoat, however, locally applied undercoat for repair of shallow pits or grooves is permitted (see 5.1.1). 5.6.3 Thicknec
37、,s- Unless otherwise specified in the contract or order (see 6.1), after finish grinding, the plating thickness sharl meet the specified thickness in accordance with the dimensional requirements, and in the case of salvage operations, to correct the deficiency. plating shall be accomplished in a man
38、ner so that the fina1 plating thickness (including previously deposited chromium not removed) will meet the following Ximits : Preparation of the shaft for Minimum th f ckne s s Maximum t h i cknes s Type of shaft micrometer (inch) micrometer (inch) Straight 37.5 (0.0015) 625 (0.025) Crankshaft 125
39、(O, 005) 250 (0.010) 5.6.4 Depositional increment. Unless otherwise specified in the contract or order (see 6.1) maximum increment of deposition shall not exceed 300 micro- meters (um) (0.012 inch) radial thickness. Finish radial thicknesses in excess of 250 um (0.010 inch) shall be applied in appro
40、ximately equal increments and each increment ground to remove from 12.5 to 50 um (0.0005 to 0.002 inch) radial thickness of chromium. 5.6.5 Single shaft processing. Unless the shaft being plated is connected either to a separate rheostat and metering system or is one of a production run under platin
41、g control equivalent to single piece operation, it shall be the only in-tank work during the time of electrodeposition. 5.6.6 Coverage. The plating shall cover all surfaces where build-up or salvage repair is required including keyways, shaft shoulders and shaft diameters. 5.6.7 Masking. Areas to be
42、 immersed in the plating solution which are not to be plated shall be properly masked. 5.6.8 Embrittlement relief. Coated steel shafts having a hardness of Rockwell C 35 and higher shall be baked at 191 If: 14OC (375 k 25OF) for a minimum of 4 hours, within 4 hours after plating to provide hydrogen
43、embrittle- ment relief, When specified (see 6.1), shafts having a tensile strength level of 1655 MPa (240,000 lb/in2) or above shall have notched specimens concurrently plated and baked, The specimens, prepared and tested in accordance with 5.9,2.2 and 5.9.7 respectively, shall not crack or fracture
44、. 5.6.9 Surface finish of bearing and sealing surfaces. When specified (see 6.1), bearing and sealing surfaces of shafts shall be finished by grinding and lapping, or honing to meet the specified surface finish. Chromium deposition 4 Provided by IHSNot for ResaleNo reproduction or networking permitt
45、ed without license from IHS-,-,-DOD-STD-2182(SH) 29 January 1985 shall be sufficient to permit grinding of the deposit so as to produce a smooth, nonabrasive surface. Bearing and sealing surfaces shall not be used in the as-plated condition. 5.6.10 Plating quality. The plating shall be fully bright,
46、 smooth, fine grsined, adherent, uniform in appearance free from blisters, pits, nodules, frosty areas, excessive edge build-up and other defects. The plating shall show no indications of contamination or improper operation of equipment used to produce the deposit, such as excessively powdered or da
47、rkened plating, or other defects. The size and number of contact marks shall be at a minimum consistent with good shop practice. demonstrated as resulting from rinsing or slight discoloration resu1tiI.g from baking operations to relieve embrittlement shall not be cause for rejection. Superficial sta
48、ining which has been 5.6.11 Adhesion. The adhesion of the plating shall be such that, when examined at a magnification of approximately 10 diameters, the chromium plating shall not show separation from the base metal when subjected to test methods in accordance with 5.9.5. The formation of hairline
49、cracks caused by post-plate grinding which does not result in flaking, peeling or blistering of the plate shall not be cause for rejection. 5.6.12 Hardness. The hardness of the chromium plating, when tested in accordance with 5.9.6 shall have a minimum average Knoop hardness from six readings of 750 HKlO0. of the following: 5.7 Certification test requirements. Certification control shall consist
