1、 METRICMIL-STD-1500C (USAF) 01 March 2007 SUPERSEDING MIL-STD-1500B 2 APRIL 1990 DEPARTMENT OF DEFENSE STANDARD PRACTICE CADMIUM-TITANIUM PLATING, LOW EMBRITTLEMENT, ELECTRODEPOSITION This document is inactive for new design. AMSC: N/A AREA: MFFP Provided by IHSNot for ResaleNo reproduction or netwo
2、rking permitted without license from IHS-,-,-MIL-STD-1500C F O R EW O R D 1. This Military Standard is approved for use by 309MXSG/MXRL, 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 for the Air F
3、orce 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 AFB, UT 84
4、056-2609 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 from IHS-,
5、-,-MIL-STD-1500C CONTENTS PARAGRAPHS PAGE FOREWORD i 1. SCOPE 1 1.1 General 1 1.2 Documentation 1.3 Classification 1 1.3.1 Classes 1.3.2 Types 1 2. APPLICABLE DOCUMENTS2.1 Government Documents 1 2.1.1 Specifications, standards, handbook, and commercial item descriptions 1 2.2 Other Government Docume
6、nts 2 2.3 Non-Government Publications 2 2.4 Order of Precedence 3 3. DEFINITIONS 3 3.1 High Strength Steel 3 3.2 Material Batch 3 4. GENERAL REQUIREMENTS 3 4.1 Materials and Equipment 3 4.1.1 Materials 3 4.1.2 Equipment 3 4.2 Specification SAE-AMS-QQ-P-416 4 4.3 Finish 4 4.4 Corrosion 4 4.5 Titanium
7、 Content of Plating 4 4.6 Embrittlement 4 4.7 Reprocessing 5 5. DETAILED REQUIREMENTS 5 5.1 Prior to Plating 5 5.1.1 Baking 5 5.1.2 Storage 5.1.3 Handling of Parts 5 5.1.4 Masking 5 5.1.5 Racking 5.1.6 Plating Sequence 5 5.2 Plating Procedures 5.2.1 Step Number 1 5 iii Provided by IHSNot for ResaleN
8、o reproduction or networking permitted without license from IHS-,-,-MIL-STD-1500C CONTENTS PARAGRAPH PAGE 5.2.2 Step Number 2 5 5.2.3 Step Number 3 6 5.2.4 Step Number 4 6 5.2.5 Step Number 5 6 5.2.6 Step Number 6 6 5.2.7 Step Number 7 6 5.2.8 Step Number 8 6 5.3 Post Plate Treatment 6 5.3.1 Types o
9、f Plating 6 5.4 Inspection 7 5.5 Process Controls 7 5.6 Qualification Embrittlement Test 7 5.7 Process Control Embrittlement Acceptance Test 8 5.7.1 Method I, Hydrogen Detection Instrument Testing 8 5.7.2 Method II, Notched Tensile Test 8 5.8 Titanium Content of Plating 8 5.9 Safety and health 9 5.1
10、0 Environmental Precautions 9 6. NOTES 6.1 Intended Use 9 6.2 Subject term (key word) listing 9 6.3 Changes from previous issue 9 CONCLUDING MATERIALS 9 iv Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-1500C 1. SCOPE 1.1 Scope. This standar
11、d covers the process and materials required for the electro-deposition of cadmium-titanium on high strength steel substrates. Subsequent heat treating techniques intended to minimize the effects of hydrogen embrittlement of the steel substrate are also described. This process is not authorized for u
12、se on steel heat treated above 1.65 X 109 Pa (240,000 pounds per square inch psi) without the approval of the applicable procuring activity. 1.2 Documentation. This standard meets the corrosion resistance requirements of SAE-AMS-QQ-P-416. It may be used whenever SAE-AMS-QQ-P-416 is specified provide
13、d any unique requirements in SAE-AMS-QQ-P-416 are complied with. 1.3 Classification. 1.3.1 Classes. The following classes of cadmium-titanium plating are covered by this standard: a. Class 1 0.013 millimeters (mm) (0.0005 inch) thick minimum. b. Class 2 0.008mm (0.0003 inch) thick minimum. c. Class
14、3 0.005mm (0.0002 inch) thick minimum. 1.3.2 Types. The following types of cadmium-titanium plating covered by this standard: a. Type I Without supplementary chromate or phosphate treatment. b. Type II With supplementary chromate treatment. c. Type III With supplementary phosphate treatment. 2. REFE
15、RENCE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards, handbooks, and commercial items descriptions. The following specifications, standards, handbooks, and commercial items descriptions form a part of this document to the extent specified herein. Unless otherwise specified, the
16、issues of these documents are those cited in the solicitation or contract. COMMERCIAL ITEM DESCRIPTION A-A-50800 Cadmium Oxide A-A-51126 Anodes, Cadmium 1 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-1500C DEPARTMENT OF DEFENSE SPECIFICATI
17、ON MIL-S-5002 Surfaces Treatments and Inorganic Coatings for Metal Surfaces of Weapons Systems DEPARTMENT OF DEFENSE STANDARDS MIL-STD-871 Electro-Chemical Stripping of Inorganic Finishes (Inactive) MIL-STD- 1504 Abrasive Blasting (Inactive) (Copies of these documents are available online http:/assi
18、st.daps.dla.mil or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2 Other Government Documents. The following other Government documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues
19、 of these documents are those cited in the solicitation or contract. CODE OF FEDERAL REGULATIONS (CFR) 29 CFR 1910 Toxic and Hazardous Substances (Copies of this document are available online at www.access.gpo.gov/nara/cfr or from the Superintendent of Documents, U.S. Printing Office, North Capitol
20、however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. DEFINITIONS 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 (180,000psi) and above. 3.2 Material Batch. All items pro
21、cessed at one time through the plating bath. 4. GENERAL REQUIREMENTS 4.1 Materials and Equipment. 4.1.1 Materials. The use of reclaimed materials shall be encouraged to the maximum extent possible. Materials used in cadmium-titanium plating are as follows: a. Cadmium Ball Anodes, A-A-51126 b. Cadmiu
22、m Oxide, A-A-50800 c. Sodium Cyanide, Plating Grade, (96-98%NaCN) d. Sodium Hydroxide, Flake or Granulated e. Titanium Additive Compound f. Hydrogen Peroxide - 35% Technical Grade g. Filter Aid, Diatomaceous, Celite 501, John Manville or equivalent. 4.1.2 Equipment. Equipment used in cadmium-titaniu
23、m plating. a. Either generated or rectified D.C. current may be used. Ripple value shall not exceed 10 percent as measured by dividing the Root Mean Square of the A.C. voltage component by the D.C. voltage. b. Tanks should be resistant to the operating temperature and chemical environment. The cadmi
24、um plating tank must be of 300 series stainless steel, carbon steel with a rigid polyvinylchloride lining, or other suitable non-metallic material, which has been determined to be compatible with cadmium titanium plating solutions. c. Plating tanks to be operated at temperatures other than room temp
25、erature shall be equipped with an automatic temperature indicating and regulating devices. d. An ammeter shall be placed in series with the cadmium-titanium tank cathode. The ammeter shall have sufficient shunts and switches to provide a full-scale reading equal to the maximum capacity of the power
26、source, and an accuracy of 10 percent of the current being measured. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-1500C e. If conventional ball anodes are used, carriers may be made of either titanium or stainless steel. Cadmium bar anod
27、es may be used if they are cast with no central steel spline and titanium or stainless steel hooks are used. Auxiliary or internal anodes must be of cadmium or 300 series stainless steel. f. This process requires a continuously filtered bath. The filter must be of a type that permits introduction of
28、 the titanium paste mixture on the filter cloth. The filter must have a plate area of 0.98 to 2.45 square meters per kiloliter (40 to 100 square feet per 1,000 gallons) of plating solution. The filtration equipment must be 300 series stainless steel or have an approved type of lining such as rigid p
29、olyvinylchloride or other un-plasticized material. The filter cloth material should be of a high grade chemical resistant fabric. Cotton cannot be used in this system. g. A blast cabinet shall be located near the plating line. The size of the cabinet shall be adequate to enclose the parts to be plat
30、ed. Air lines shall be suitably trapped and filtered to prevent in-process contamination of the parts to be cleaned. h. An oven capable of baking part at 190 14C (375 25F) shall be located near the plating line. The size of the oven shall be adequate to enclose parts to be plated. The oven shall be
31、equipped with temperature indicating, recording and regulating devices. 4.2 Specification SAE-AMS-QQ-P-416. The requirements of SAE-AMS-QQ-P-416 shall be complied with on all parts, in conjunction with those specified in this standard. If there is a conflict between the two documents, the requiremen
32、ts of this standard shall govern. 4.3 Finish. The plated parts will have a finish that is smooth, continuous, homogeneous adherent and free from pits, blisters, nodules and any other indications of harmful defects. The appearance of a properly applied deposit may vary from a dull gray to a frosty wh
33、ite. A bright, shiny deposit indicates malfunction of the process, which may produce embrittled parts (see: MIL-S-5002) 4.4 Corrosion. The test panel shall show no corrosion on the base metal after 500 hours exposure to salt spray per ASTM B117. Corrosion at the edges of the panel shall not constitu
34、te failure. 4.5 Titanium Content of Plating. The titanium content of the plate shall be between 0.07 and 0.5 percent titanium. 4.6 Embrittlement. Qualification test specimens and process control test specimens shall be subjected to a sustained load test at 75 percent of the ultimate notched tensile
35、strength. The specimens shall endure this sustained load for 200 hours minimum without failing or cracking. If hydrogen detection instrument testing is used for process control, the test must meet the requirements of the instrument manufacturer. 4.7 Reprocessing. Parts rejected for defective plating
36、, requiring stripping and re-plating, shall include all of the pre-plating steps of this standard. Parts shall be stripped in accordance with MIL-STD-871. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-1500C 5. DETAILED REQUIREMENTS 5.1 Pr
37、ior to Plating. Prior to plating, all machining, forming, welding, and shot peening shall be completed. 5.1.1 Baking. Parts shall be baked for stress relief before plating for four hours minimum at 190 14C (375 25F). Shot peening when required shall be performed before plating and after stress relie
38、ving. 5.1.2 Storage of Parts. Storage of parts between stress relief and cleaning shall be controlled to prevent contact with water or other corrosive materials. Parts should be stored to permit free circulation of air around the parts. 5.1.3 Handling of Parts. After parts have been cleaned, they sh
39、all be handled in such a manner, white gloves, etc, that will assure a minimum of contamination. 5.1.4 Masking. Sections or areas of a part that are not to be plated shall be masked off. Plug and masking materials, which do not contaminate the plating bath shall be used. Masking should be performed
40、at the most convenient step prior to plating. 5.1.5 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. 5.1.6 Plating Sequence. If chromium and cadmium are used in combinat
41、ion, the chromium shall be deposited first. When chrome plating is to be followed by cadmium plating the 23 hour minimum bake period following chrome can be replaced by a four hour bake period at 190 14C (375 25F) provided the part is baked for 23 hours minimum after completion of the cadmium-titani
42、um plating. 5.2 Plating Procedures. The cadmium-titanium plating procedure shall be performed as follows: 5.2.1 Step Number 1. Parts shall be degreased as necessary. No minimum elapsed time requirement shall apply between this operation and the cleaning operation of 5.2.2. WARNING PROVIDE ADEQUATE V
43、ENTILATION DURING DEGREASING OPERATIONS. AVOID SKIN AND EYE CONTACT WITH SOLVENT SOLUTIONS. 5.2.2 Step Number 2. All parts shall be cleaned by dry blasting using 80 320 grit aluminum oxides (AI2O3), silicon dioxide (SiO3), or garnet per MIL-STD-1504. Elapsed time between completion of cleaning and S
44、tep Number 3 shall not exceed 60 minutes. 5.2.3 Step Number 3. Rinse parts in cold water (Optional). A cyanide holding tank can be used to hold parts if the plating tank is full. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-1500C 5.2.4 S
45、tep Number 4.(Optional). All parts can be dipped in a 2-4 percent by volume hydrochloric acid (HC1) solution, (60 seconds maximum at ambient temperature) followed by a cold water rinse. 5.2.5 Step Number 5. Cadmium plate in the solution listed below. Apply voltages so that the current will flow upon
46、 immersion of parts. Strike the parts at 4.3 to 5.4 amperes/sq decimeter (40 50 amps/sq ft asf) for 15 seconds, and then reduce the current to 1.6 to 3.2 amperes/sq decimeter (15 30 asf) until the required thickness of cadmium-titanium has been deposited. a. Cadmium metal 18.5 33.5 g/l (2.5 4.5 oz/g
47、al) b. Total cyanide 74 200 g/l (10 27 oz/gal) c. Sodium hydroxide 11.25 30 g/l (1.5 4 oz/gal) d. Titanium 40 100 mg/l (40 100 ppm) e. Sodium carbonate 0 60 g/l (0 8 oz/gal) f. Ratio NaCn/Cd 4/1 to 6/1 g. Total permissible iron 300 mg/l (300 ppm) h. Temperature 15 - 30C (60 - 85F) WARNING PROVIDE ADEQUATE VENILATION WHEN USING CADMIUM PLATING SOLUTIONS CONTAINING SODIUM HYDROXIDE AND SODIUM CYANIDE WEAR PROTECTIVE RUBBER GLOVES AND CHEMICAL GOGGLES
