1、APPROVED FOR PUBLIC RELEASEDISTRIBUTION IS UNLIMITED 1 of 29 NASA TECHNICAL STANDARD NASA-STD-6012 National Aeronautics and Space Administration Approved: 03-08-2012 Washington, DC 20546-0001 CORROSION PROTECTION FOR SPACE FLIGHT HARDWARE MEASUREMENT SYSTEM IDENTIFICATION: METRIC/SI (ENGLISH) Provid
2、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NASA-STD-6012 APPROVED FOR PUBLIC RELEASEDISTRIBUTION IS UNLIMITED 2 of 29 DOCUMENT HISTORY LOG Status Document Revision Approval Date Description Baseline 03-08-2012 Initial Release This standard was transit
3、ioned from MSFC-SPEC-250A, dated 10-01-1977. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NASA-STD-6012 APPROVED FOR PUBLIC RELEASEDISTRIBUTION IS UNLIMITED 3 of 29 FOREWORD This Standard is published by the National Aeronautics and Space Administ
4、ration (NASA) to provide uniform engineering and technical requirements for processes, procedures, practices, and methods that have been endorsed as standard for NASA programs and projects, including requirements for selection, application, and design criteria of an item. This Standard is approved f
5、or use by NASA Headquarters and NASA Centers, including Component Facilities and Technical and Service Support Centers. This Standard establishes requirements for the protective finishes of space vehicles and associated flight hardware. Requests for information, corrections, or additions to this Sta
6、ndard should be submitted via “Feedback” in the NASA Standards and Technical Assistance Resource Tool at http:/standards.nasa.gov. Original Signed By: 03-08-2012 _ _ Michael G. Ryschkewitsch NASA Chief Engineer Approval Date Provided by IHSNot for ResaleNo reproduction or networking permitted withou
7、t license from IHS-,-,-NASA-STD-6012 APPROVED FOR PUBLIC RELEASEDISTRIBUTION IS UNLIMITED 4 of 29 SECTION TABLE OF CONTENTS PAGE DOCUMENT HISTORY LOG . 2 FOREWORD . 3 TABLE OF CONTENTS 4 LIST OF TABLES . 5 1. SCOPE 6 1.1 Purpose . 6 1.2 Applicability . 6 1.3 Tailoring . 6 2. APPLICABLE DOCUMENTS . 7
8、 2.1 General . 7 2.2 Government Documents 7 2.3 Non-Government Documents 8 2.4 Order of Precedence . 10 3. ACRONYMS AND DEFINITIONS . 10 3.1 Acronyms, Abbreviations, and Symbols . 10 3.2 Definitions . 11 4. REQUIREMENTS . 12 4.1 Corrosion Prevention and Control Plan . 12 4.1.1 Materials and Processe
9、s . 12 4.1.2 Order of Precedence . 13 4.2 Classification of Corrosive Environments 13 4.3 Cleaning and Surface Preparation 14 4.4 Performance Requirements 15 4.4.1 Class 1: Seawater Immersion 17 4.4.2 Class 2: Seacoast . 17 4.4.3 Class 3: Inland, Outdoor . 18 4.4.4 Class 4: Chemical or Microbial-Ind
10、uced Corrosion . 18 4.4.5 Class 5: Indoor, Uncontrolled . 19 4.4.6 Class 6: Indoor, Controlled . 19 4.5 Process Verification . 19 4.6 Metallic Finishes 19 4.6.1 Approved Finishes . 19 4.6.1.1 Nickel Plating 20 4.6.1.2 Chromium Plating 20 4.6.1.3 Zinc-Nickel Plating 21 4.6.1.4 Copper Plating . 21 Pro
11、vided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NASA-STD-6012 APPROVED FOR PUBLIC RELEASEDISTRIBUTION IS UNLIMITED 5 of 29 4.6.1.5 Silver Plating 21 4.6.1.6 Tin Plating 22 4.6.1.7 Gold Plating . 22 4.6.1.8 Ion Vapor Deposited (IVD) Aluminum . 22 4.6.1.9
12、 Sprayed Metal Coatings . 22 4.6.2 Prohibited Finishes 22 4.6.2.1 Cadmium Plating . 23 4.6.2.2 Zinc Plating 23 4.7 Inorganic Finishes 23 4.8 Organic Finishes 23 4.9 Design Considerations for Corrosion Control . 24 4.9.1 Cut Edges . 24 4.9.2 Drainage . 24 4.10 Dissimilar Materials . 24 4.11 Faying Su
13、rfaces, Joints, and Seams . 26 4.11.1 Faying Surfaces 26 4.11.2 Fasteners 26 4.11.3 Electrical Bonding and Grounding 27 APPENDIX A Sample Data Requirements Description (DRD) 28 LIST OF TABLES TABLE PAGE 1 Matrix of Class Environments and Test Methods 16 2 Compatible Couples in Seawater . 25 Provided
14、 by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NASA-STD-6012 APPROVED FOR PUBLIC RELEASEDISTRIBUTION IS UNLIMITED 6 of 29 CORROSION PROTECTION FOR SPACE FLIGHT HARDWARE 1. SCOPE 1.1 Purpose The purpose of this Standard is to describe the general corrosion p
15、rotection requirements applicable to the surface treatment and finishing of space flight hardware. This Standard contains the minimum requirements necessary to qualify materials and processes for corrosion control of space flight hardware. Additional testing may be required to meet the requirements
16、for materials and processes used in space flight hardware systems contained in NASA-STD-6016, Standard Materials and Processes Requirements for Spacecraft. Materials and processes used in interfacing ground support equipment, test equipment, hardware processing equipment, hardware packaging, and har
17、dware shipment are to be controlled to prevent damage to or contamination of flight hardware. 1.2 Applicability This Standard is applicable to all National Aeronautics and Space Administration (NASA) space flight hardware, including launch vehicles. This Standard is approved for use by NASA Headquar
18、ters and NASA Centers, including Component Facilities and Technical and Service Support Centers, and may be cited in contract, program, and other Agency documents as a technical requirement. This Standard may also apply to the Jet Propulsion Laboratory or to other contractors, grant recipients, or p
19、arties to agreements only to the extent specified or referenced in their contracts, grants, or agreements. Requirements are numbered and indicated by the word “shall.” Explanatory or guidance text is indicated in italics beginning in section 4. a. Programs shall apply these controls to program/proje
20、ct hardware. Programs, projects, and elements are responsible for flowing requirements down to contractors, subcontractors, and the lowest component-level suppliers. b. Programs shall be responsible for demonstrating compliance with these requirements. 1.3 Tailoring a. Tailoring of this Standard for
21、 application to a specific program or project shall be documented formally as part of program or project requirements and approved by the Technical Authority. Tailoring also includes using existing or previously developed contractor processes and standards as a submittal of the various required plan
22、s. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NASA-STD-6012 APPROVED FOR PUBLIC RELEASEDISTRIBUTION IS UNLIMITED 7 of 29 b. The tailoring of requirements shall be documented in the Materials and Processes Selection, Control, and Implementation P
23、lan in accordance with NASA-STD-6016 or as part of a Corrosion Prevention and Control Plan by providing the degree of conformance and the method of implementation for each requirement identified in this Standard. c. Once a Corrosion Prevention and Control Plan has been approved as an acceptable mean
24、s of compliance with the technical requirements of this Standard, the Corrosion Prevention and Control Plan shall be used for the implementation and verification of requirements on the applicable program/project. 2. APPLICABLE DOCUMENTS 2.1 General The documents listed in this section contain provis
25、ions that constitute requirements of this Standard as cited in the text. 2.1.1 The latest issuances of cited documents shall apply unless specific versions are designated. 2.1.2 Non-use of specific versions as designated shall be approved by the responsible Technical Authority. The applicable docume
26、nts are accessible via the NASA Standards and Technical Assistance Resource Tool at http:/standards.nasa.gov or may be obtained directly from the Standards Developing Organizations or other document distributors. 2.2 Government Documents Military MIL-A-8625 Anodic Coatings for Aluminum and Aluminum
27、Alloys MIL-A-22262 Abrasive Blasting Media Ship Hull Blast Cleaning MIL-DTL-5541 Chemical Conversion Coatings on Aluminum and Aluminum Alloys MIL-DTL-16232 Phosphate Coating, Heavy, Manganese or Zinc Base MIL-DTL-45204 Gold Plating, Electrodeposited. MIL-DTL-83488 Coating, Aluminum, High Purity Prov
28、ided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NASA-STD-6012 APPROVED FOR PUBLIC RELEASEDISTRIBUTION IS UNLIMITED 8 of 29 MIL-STD-810 Environmental Engineering Considerations and Laboratory Tests (Test Method 508) MIL-STD-869 Flame Spraying MIL-STD-1501
29、 Chromium Plating, Low Embrittlement, Electro-Deposition NASA NASA-STD-4003 Electrical Bonding for NASA Launch Vehicles, Spacecraft, Payloads, and Flight Equipment NASA-STD-5008 Protective Coating of Carbon Steel, Stainless Steel, and Aluminum on Launch Structures, Facilities, and Ground Support Equ
30、ipment NASA-STD-6016 Standard Materials and Processes Requirements for Spacecraft 2.3 Non-Government Documents American Welding Society (AWS) AWS C2.23M Specification for the Application of Thermal Spray Coatings (Metallizing) of Aluminum, Zinc, and Their Alloys and Composites for the Corrosion Prot
31、ection of Steel ASTM International (ASTM formerly American Society for Testing and Materials) ASTM B 117 Standard Practice for Operating Salt Spray (Fog) Apparatus ASTM B488 Standard Specification for Electrodeposited Coatings of Gold for Engineering Uses ASTM B545 Standard Specification for Electro
32、deposited Coatings of Tin ASTM B 700 Standard Specification for Electrodeposited Coatings of Silver for Engineering Use ASTM B733 Standard Specification for Autocatalytic (Electroless) Nickel-Phosphorus Coatings on Metal ASTM D 1654 Standard Test Method for Evaluation of Painted or Coated Specimens
33、Subjected to Corrosive Environments Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NASA-STD-6012 APPROVED FOR PUBLIC RELEASEDISTRIBUTION IS UNLIMITED 9 of 29 ASTM D2247 Standard Practice for Testing Water Resistance of Coatings in 100 % Relative Hum
34、idity ASTM D 3273 Standard Test Method for Resistance to Growth of Mold on the Surface of Interior Coatings in an Environmental Chamber ASTM D5894 Standard Practice for Cyclic Salt Fog/UV Exposure of Painted Metal, (Alternating Exposures in a Fog/Dry Cabinet and a UV/Condensation Cabinet) ASTM G 1 S
35、tandard Practice for Preparing, Cleaning, and Evaluating Corrosion Test Specimens ASTM G7 Standard Practice for Atmospheric Environmental Exposure Testing of Nonmetallic Materials ASTM G50 Standard Practice for Conducting Atmospheric Corrosion Tests on Metals ASTM G 52 Standard Practice for Exposing
36、 and Evaluating Metals and Alloys in Surface Seawater ASTM G85 Standard Practice for Modified Salt Spray (Fog) Testing Society of Automotive Engineers (SAE)/Aerospace Material Specification (AMS) SAE AMS 2403 Plating, Nickel General Purpose SAE AMS2417 Plating, Zinc-Nickel Alloy SAE AMS2418 Plating,
37、 Copper SAE AMS 2423 Plating, Nickel Hard Deposit SAE AMS 2447 Coating, Thermal Spray, High Velocity Oxygen/Fuel Process SAE AMS 2460 Plating, Chromium SAE AMS2700 Passivation of Corrosion Resistant Steels SAE AMS2759/9 Hydrogen Embrittlement Relief (Baking) of Steel Parts Provided by IHSNot for Res
38、aleNo reproduction or networking permitted without license from IHS-,-,-NASA-STD-6012 APPROVED FOR PUBLIC RELEASEDISTRIBUTION IS UNLIMITED 10 of 29 The Society for Protective Coatings (SPPC) SSPC-AB 1 Mineral and Slag Abrasives SSPC-SP 10 Near-White Metal Blast Cleaning 2.4 Order of Precedence This
39、Standard establishes requirements for protective finishes for all space flight hardware, including launch vehicles, but does not supersede nor waive established Agency requirements found in other documentation. 2.4.1 Conflicts between this Standard and other requirements documents shall be resolved
40、by the responsible Technical Authority. 3. ACRONYMS AND DEFINITIONS 3.1 Acronyms, Abbreviations, and Symbols C degree Celsius F degree Fahrenheit greater than greater than or equal to 9 percent) phosphorous content provides superior corrosion resistance in acidic environments. d. Nickel plating on s
41、teel heat treated to an ultimate tensile strength (UTS) over 1,000 MPa (145 ksi) shall receive a post-plating bake cycle. ASTM B733 contains guidance on post-plating bake cycles for electroless nickel plating. e. For steels above 1,240 MPa (180 ksi), post-plating heat treatment shall conform to SAE
42、AMS2759/9, Hydrogen Embrittlement Relief (Baking) of Steel Parts. 4.6.1.2 Chromium Plating a. Chromium plating shall conform to SAE AMS 2460, Plating, Chromium. Chromium plating may be used for applications up to 538 C (1,000 F) or when an abrasion-resistant surface is required. Provided by IHSNot f
43、or ResaleNo reproduction or networking permitted without license from IHS-,-,-NASA-STD-6012 APPROVED FOR PUBLIC RELEASEDISTRIBUTION IS UNLIMITED 21 of 29 b. Chromium plating on steel heat treated to a UTS of 1,100 to1,240 MPa (160 to180 ksi) shall receive a post-plating bake cycle in accordance with
44、 SAE AMS2759/9. c. For steels above 1,240 MPa (180 ksi), chromium plating and post-plating heat treatment shall conform to MIL-STD-1501, Chromium Plating, Low Embrittlement, Electro-Deposition. 4.6.1.3 Zinc-Nickel Plating Zinc-nickel coatings shall conform to SAE AMS2417, Plating, Zinc-Nickel Alloy.
45、 Zinc-nickel coatings offer several advantages over cadmium plating (improved corrosion resistance, low embrittlement process, and lower environmental hazard) and may be considered as a cadmium alternative. 4.6.1.4 Copper Plating Copper plating shall conform to the requirements of SAE AMS2418, Plati
46、ng, Copper. 4.6.1.5 Silver Plating a. Silver plating shall conform to the requirements of ASTM B 700, Standard Specification for Electrodeposited Coatings of Silver for Engineering Use. b. Electrically deposited silver shall not be used as a plating on printed wiring boards and terminal boards becau
47、se of potential dendrite growth. This requirement does not apply to chemically deposited immersion silver, which does not have the same tendency for dendrite growth. c. Silver plating shall not be used on bus bars and mechanical electrical contacts such as connector pins and sockets because it can t
48、arnish and degrade electrical conductivity. d. Because silver plating over copper can cause the formation of cuprous oxide corrosion (red plague) when stored in a high humidity environment, mitigation requirements for such shall be included in the Corrosion Prevention and Control Plan. Silver plating is susceptible to attack by atomic oxygen in low Earth orbit applications. Silver plating is also susceptible to forming dendrites when exposed to sulfur-/sulfide-cont
