ARMY MIL-HDBK-1250 A-1995 CORROSION PREVENTION AND DETERIORATION CONTROL IN ELECTRONIC COMPONENTS AND ASSEMBLIES《电子元件和组件的防腐蚀和损耗控制》.pdf

1、Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-1250AiiFOREWORD1. This military standard is approved for use by all Departments and Agencies ofthe Department of Defense2. Beneficial comments (recommendations, additions, deletions) and any per

2、tinentdata which may be of use in improving this document should be addressed to:Commander, US Army Missile Command, ATTN: AMSMI-RD-SE-TD-ST,Redstone Arsenal, AL 35898-5270 by using the Standardization DocumentImprovement Proposal (DD For 1426) appearing at the end of this document orby letter.3. Th

3、e purposes of this standard are to draw attention to the importance ofcorrosion as a major factor in the degradation of performance of electronicitems; to establish minimum requirements for the control of corrosion anddeterioration in DoD systems and applications; and to provide a guide to theselect

4、ion of protective measures. The choice of materials and processes forelectronic applications is, naturally, based on electrical properties not includedin this document. It is the aim of this standard to aid in selecting from amongsuitable materials and processes, those which will withstand the attac

5、k ofadverse environments during storage, shipment and service.4. This standard supplements the more general requirements of MIL-STD-454,titled “Standard General Requirements for Electronic Equipment,“ with detailedinformation on the maintenance of desired characteristics during and afterexposure to

6、anticipated environments. The circuitry or design is not pertinentto this standard except insofar as design affects susceptibility to corrosion.5. Contractors (and subcontractors) are encouraged to present new designs,materials, and technology which will improve the items or products, but shouldobta

7、in procuring activity approval prior to such use.6. Compliance with this standard will promote reliability of electroniccomponents and assemblies, by preventing or minimizing deterioration fromenvironmental causes.Provided by IHSNot for ResaleNo reproduction or networking permitted without license f

8、rom IHS-,-,-MIL-STD-1250AiiiCONTENTSPARAGRAPH PAGE1.1.11.2SCOPEScopeApplication1112.2.12.1.12.22.3APPLICABLE DOCUMENTSGovernment documentsSpecifications, standards and handbooksNon-Government publicationsOrder of precedence222663.3.13.23.33.43.53.63.73.83.8.13.8.23.8.33.8.43.93.103.113.123.133.14DEF

9、INITIONSStandard definitionsCorrosionCorrosion-resistant steelsDeteriorationDissimilar metalsElectromagnetic interference (EMI)EncapsulationFungusFungicidalFunginertFunginutrientFungus resistantGalvanic seriesHermetic sealPurple plagueRed plagueStress corrosionVapor (or volatile) corrosion inhibitor

10、77777777777778888884.4.14.24.34.3.14.4GENERAL REQUIREMENTSUnacceptable designsUnacceptable materialsCleaningWiring assembliesWorkmanship99101011115.5.15.1.1DETAILED REQUIREMENTSAtmosphere in equipmentEvacuation121212Provided by IHSNot for ResaleNo reproduction or networking permitted without license

11、 from IHS-,-,-MIL-STD-1250AivCONTENTSPARAGRAPH PAGE5.1.25.1.35.1.3.15.25.35.3.15.3.25.3.35.3.45.3.55.3.65.3.6.15.3.6.25.3.6.35.3.6.3.15.3.6.45.3.6.55.3.6.65.3.6.75.3.6.85.3.6.95.3.6.105.3.6.115.3.6.125.3.75.45.4.15.4.25.55.5.15.5.25.5.35.65.75.7.15.7.25.7.2.15.7.35.7.45.7.5Hermetic sealClean airCool

12、ingMoistureSelection of metalsSurface contaminationIntergranular and stress corrosionHydrogen embrittlementWhisker growthElectrolysis and silver migrationMetallic coatingsCadmium platingChromium platingCopper platingPlating over copperGold platingNickel coatingPalladium coatingSilver platingTin coat

13、ingTin-lead coatingZinc platingMetallic coatings on nonmetalsVapor deposited coatingsCastingsFerrous metalsCorrosion resistant steelsCarbon and low alloy steelsNon-ferrous metalsAluminumCopperMagnesiumGalvanic corrosionJoiningAdhesive bondingMechanical joints, structuralCrevice corrosionCrimped and

14、wrapped leadsBrazingSoldering12121212121313131314141414141415151616161616161616171717171718181922232324242424Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-1250AvCONTENTSPARAGRAPH PAGE5.7.65.7.75.85.8.15.8.25.8.35.8.45.8.55.95.105.115.11.15.

15、11.25.125.135.13.15.145.155.165.16.15.16.25.16.35.16.45.175.185.195.205.215.21.15.225.22.15.22.2Welding, structuralWelding, electrical purposesElectrical bonding and groundsAluminum surfaces to be bondedBonding dissimilar metalsBonding at a later timeConductive adhesivesConductive gasketsSelection o

16、f nonmetallicsMoisture resistanceFungus resistantMetalsGlass and ceramicsTemperature resistanceCompatibility with other materialsOutgassingFlame and arc resistanceRubbers and elastomersOils, greases, and lubricantsSilicone oils and greasesCorrosion inhibitingWater displacing compoundsSolid film lubr

17、icantsCotton and linenWood and corkEncapsulantsConformal coatingsInsulators, insulating and dielectric materialsCeramic and glass materialsPackaging and preservationIncompatible packaging materialsVolatile corrosion inhibitors24252525262626262627272828292929303132323232323232333737373737376.6.16.26.

18、36.46.5NOTESIntended useIssue of DODISSMetricationSubject term (key word) listingChanges from previous issue383838383838Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-1250AviCONTENTSTABLE PAGEIIIIIIIVVVIVIIVIIIIXXXISelection of metallic coat

19、ings for minimum corrosionSurface finish for electrical bondingGalvanic couplesPrevention of dissimilar metal corrosionChecklist for adhesive bondingChecklist for elecrtrical bondingEffect of moisture on nonmetallic materialsFunginert materialsExamples of incompatible materialsArc-resistant material

20、sUses and limitations of lubricants1518202123252728303134Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-1250A11. SCOPE1.1 Scope. This standard establishes minimum requirements for procedures, materialsand systems for protecting electronic co

21、mponents in DoD systems and assemblies fromadverse environments. Protective measures shall be sufficient to maintain performancecharacteristics within specified limits both during and after exposure to moisture, high andlow temperatures, corrosive gases, chemicals and microbial (fungal) attack. This

22、 standarddoes not deal with protection against damage from stress, shock, vibration or nuclear,biological and chemical (NBC) contamination. It is not concerned with electrical ormechanical design except insofar as design details affect susceptibility to corrosion.Provisions for prevention of deterio

23、ration shall apply to housings, chassis, hardware andsimilar parts which are assembled into electronic equipment, as well as to electronic andelectro-mechanical components. Unless specifically mentioned in the item specification ordrawing, this standard does not apply to standard commercial equipmen

24、t.1.2 Application. Unless otherwise specified, the responsibility for selecting anyprocedure, material or system shall rest with the activity procuring the end item. Wherepossible, protective measures shall be chosen from those specified herein. This does notpreclude the use of proven commercial mat

25、erials or processes selected by the manufacturer,supplier, or contractor, and concurred in by the procuring activity.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-1250A22. APPLICABLE DOCUMENTS2.1 Government documents.2.1.1 Specifications, s

26、tandards, and handbooks. The following specifications,standards, and handbooks form a part of this document to the extent specified herein. Unlessotherwise specified, the issues of these documents are those listed in the issue of theDepartment of Defense Index of Specifications and Standards (DODISS

27、) and supplementthereto, cited in the solicitation (see 6.2).SPECIFICATIONSFEDERALL-P-516 - Plastic Sheet and Plastic Rod, Thermosetting, CastQQ-C-320 - Chromium Plating (Electrodeposited)QQ-N-290 - Nickel Plating (Electrodeposited)QQ-P-35 - Passivation Treatments for Corrosion-ResistantSteelQQ-P-41

28、6 - Plating, Cadmium (Electrodeposited)QQ-S-365 - Silver Plating, Electrodeposited: GeneralRequirements forVV-L-800 - Lubricating Oil, General Purpose, Preservative(Water-Displacing, Low Temperature)VV-P-236 - Petrolatum, TechnicalZZ-R-765 - Rubber, SiliconeMILITARYMIL-I-10 - Insulating Compound, El

29、ectrical, CeramicMIL-M-14 - Molding Compounds, ThermosettingMIL-P-79 - Plastic Rods and Tubes, Thermosetting,LaminatedMIL-P-116 - Preservation, Methods ofMIL-T-152 - Treatment, Moisture and Fungus Resistant, ofCommunications, Electronic, and AssociatedElectrical EquipmentMIL-V-173 - Varnish, Moistur

30、e and Fungus Resistant (forTreatment of Communications, Electronic, andAssociated Equipment)MIL-F-495 - Finish, Chemical, Black, for Copper AlloysMIL-P-997 - Plastic Material, Laminated, Thermosetting,Electrical Insulation: Sheets, Glass Cloth, SiliconeResinMIL-L-2105 - Lubricating Oil, Gear, Multip

31、urpose (Metric)Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-1250A3MIL-R-3065 - Rubber, Fabricated ProductsMIL-L-3150 - Lubricating Oil, Preservative, MediumMIL-D-3464 - Desiccants, Activated, Bagged, Packaging Useand Static Dehumidificatio

32、nMIL-L-3918 - Lubricating Oil, Instrument, Jewel BearingMIL-S-5002 - Surfaces Treatments and Inorganic Coatings forMetal Surfaces of Weapons SystemsMIL-C-5541 - Chemical Conversion Coatings on Aluminum andAluminum AlloysMIL-L-6085 - Lubricating Oil: Instrument, Aircraft, LowVolatilityMIL-L-6086 - Lu

33、bricating Oil, Gear, Petroleum BaseMIL-R-6855 - Rubber, Synthetic Sheets, Strips, Molded orExtruded Shapes, General Specification forMIL-W-6858 - Welding, Resistance: Spot and SeamMIL-S-7124 - Sealing Compound, Polysulfide, AcceleratorRequired for Aircraft StructuresMIL-F-7179 - Finishes, Coatings,

34、and Sealants for the Protectionof Aerospace Weapons SystemsMIL-B-7883 - Brazing of Steels, Copper, Copper Alloys, NickelAlloys, Aluminum and Aluminum AlloysMIL-S-8516 - Sealing Compound, Polysulfide Rubber, ElectricConnectors and Electric Systems, ChemicallyCuredMIL-I-8574 - Inhibitors, Corrosion, V

35、olatile, Utilization ofMIL-A-8625 - Anodic Coatings, for Aluminum and AluminumAlloysMIL-C-8837 - Coating, Cadmium (Vacuum Deposited)MIL-W-8939 - Welding, Resistance, Electronic Circuit ModulesMIL-T-10727 - Tin Plating: Electrodeposited or Hot-Dipped, forFerrous and Nonferrous MetalsMIL-C-11796 - Cor

36、rosion Preventive Compound, Petrolatum, HotApplicationMIL-T-12664 - Treatment, Fungus Resistant, Paranitrophenol, forCork ProductsMIL-T-12879 - Treatments, Chemical, Prepaint and CorrosionInhibitive, for Zinc SurfacesMIL-S-13165 - Shot Peening of Metal PartsMIL-C-14550 - Copper Plating (Electrodepos

37、ited)MIL-P-15037 - Plastic Sheet, Laminated, Thermosetting, GlassCloth, Melamine-ResinMIL-L-15719 - Lubricating Grease (High-Temperature, ElectricMotor, Ball and Roller Bearings)MIL-C-16173 - Corrosion Preventive Compound, SolventCutback, Cold-ApplicationProvided by IHSNot for ResaleNo reproduction

38、or networking permitted without license from IHS-,-,-MIL-STD-1250A4MIL-I-16923 - Insulating Compound, Electrical, EmbeddingMIL-L-17331 - Lubricating Oil, Stream Turbine and Gear,Moderate ServiceMIL-I-17563 - Impregnants for Aluminum, Copper, Iron,Magnesium and Zinc Alloy CastingsMIL-H-17672 - Hydrau

39、lic Fluid, Petroleum, InhibitedMIL-W-18142 - Wood Preservative Solutions, Oil-Soluble, Shipand Boat UseMIL-P-19161 - Plastic Sheet, Laminated, Glass Cloth,Polytetrafluoroethylene ResinMIL-T-22361 - Thread Compound; Antiseize, Zinc Dust-PetrolatumMIL-S-22473 - Sealing, Locking, and Retaining Compound

40、s(Single Component)MIL-T-23142 - Tape, Pressure Sensitive Adhesive, for DissimilarMetal SeparationMIL-P-23377 - Primer Coatings: Epoxy, Chemical and SolventResistantMIL-L-23398 - Lubricant, Solid Film, Air-Cured, CorrosionInhibiting, NATO Code Number S-749MIL-P-23408 - Plating: Tin-Cadmium (Electrod

41、eposited)MIL-S-23586 - Sealing Compound, Electrical, Silicone Rubber,Accelerator RequiredMIL-G-23827 - Grease, Aircraft and Instrument, Gear andActuator Screw, NATO Code Number G-354,MetricMIL-M-24041 - Molding and Potting Compound, ChemicallyCured, PolyurethaneMIL-G-24139 - Grease, Multipurpose, Wa

42、ter ResistantMIL-M-24325 - Molding Material, Plastic, Epoxy Compounds,ThermosettingMIL-P-25518 - Plastic Materials, Silicone Resin, Glass FiberBase, Low Pressure LaminatedMIL-C-26074 - Coatings, Electroless Nickel, Requirements forMIL-P-28809 - Circuit Card Assemblies, Rigid, Flexible, andRigid-Flex

43、MIL-G-45204 - Gold Plating, ElectrodepositedMIL-P-45209 - Palladium Plating, ElectrodepositedMIL-P-46002 - Preservative Oil, Contact and Volatile Corrosion-InhibitedMIL-L-46010 - Lubricant, Solid Film, Heat Cured, CorrosionInhibitingMIL-I-46058 - Insulating Compound, Electrical (for CoatingPrinted C

44、ircuit Assemblies)Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-1250A5MIL-P-46067 - Plastic Embedding Compound, Epoxy ResinSystemMIL-R-46085 - Rhodium Plating, ElectrodepositedMIL-P-46105 - Primer Coating; Weld-Through, Zinc-RichMIL-P-46112

45、 - Plastic Sheet and Strip, PolyimideMIL-S-46163 - Sealing, Lubricating and Wicking Compounds:Thread-Locking, Anaerobic, Single-ComponentMIL-C-46168 - Coating, Aliphatic Polyurethane, Chemical AgentResistantMIL-P-46847 - Plastic Material, Foamed Polyurethane forEncapsulating Electronic ComponentsMIL

46、-C-81309 - Corrosion Preventive Compounds, WaterDisplacing, Ultra-Thin FilmMIL-G-81322 - Grease., Aircraft, General Purpose, WideTemperature Range, NATO Code Number G-395MIL-C-81562 - Coatings, Cadmium, Tin-Cadmium and Zinc(Mechanically Deposited)MIL-P-81728 - Plating, Tin-Lead (Electrodeposited)MIL

47、-S-81733 - Sealing and Coating Compound, CorrosionInhibitiveMIL-C-83488 - Coating, Aluminum, Ion Vapor DepositedMIL-C-85054 - Corrosion Preventive Compound, WaterDisplacing, Clear (Amlguard)MIL-L-87177 - Lubricants, Water Displacing, SyntheticSTANDARDSMILITARYMIL-STD-186 - Protective Finishing for A

48、rmy Missile WeaponSystemsMIL-STD-276 - Impregnation of Porous Nonferrous MetalCastingsMIL-STD-454 - Standard General Requirements for ElectronicEquipmentMIL-STD-810 - Environmental Test Methods and EngineeringGuidelinesMIL-STD-838 - Lubrication of Military EquipmentMIL-STD-1276 - Leads for Electroni

49、c Component PartsDOD-STD-1866 - Soldering Process, General (Non-Electrical)MIL-STD-2000 - Standard Requirements for Soldered Electrical andElectronic AssembliesMIL-STD-2219 - Fusion Welding for Aerospace ApplicationsProvided by IHSNot for ResaleNo reproduction or networking permitted without license from