Mil Std 1501b

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    kMIL-STD-15013(USAF)

    ...- 29 wdI 197$SUPERSEDESIL MIL-STD-1501A(USAF)22 August 1974

    MILITARY STANDARD

    CHROMIUM PLATING, LOW EMBRITTLEMENT, ELECTRODEPOSITION

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    _ ... . ... --. .L-.. . -- -.

    DEPARTMENT OF THE AIR FORCE.WASHINGTON DC 20330

    CHROMIUM PLATING, LOW EMBRITTLEMENT, ELECTRODEpOSIT1ONMIL-STD-1501B(USAF)1. This Military Standard is approved for use by HQ AFLC CASO/LODS, Department of the Air Force, and is available fo r use by.all Departments and ,AgencJ,es of the Department of Defense.~l2. Beneficial comments (recommendations, additions) and anypertinent data which may be of use in improving this documentshould be addressed to: HQ AFLC CASO/LODS, Federal Center,Battle Creek, MI 49016) by using the self-addressed Standard-ization Document Improvement Proposal (Form DD1426) appearingat the end of this document or by letter.

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    MIL-STD-1501B(USAF)CON T

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    Paragraph Page1.1.11.21.31.4

    SCOPE . . . . .Scope. . . . .Documentation.Purpose. . . .Classification

    1111111112222233334444u44445555555555666666677777:8

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    . . .1.4.1 Classes. . .1.4.2 Types. . . .

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    2. REFERENCED DOCUMENTS.2.1 Documents. . . . . .2.2 Other publications .3* DEFINITIONS . . . . .3.1 High strength steel.3.2 Material batch . . .4. GENERAL REQUIREMENTS.4.1 Materials and equipment.4.1.1 Materials. . . . .. .4.1.2 Equipment. . . . . .4.2 Specification QQ-C-320

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    4.34.44.54.64.74.84.94.104.11&.12

    Finish . . . . . .Shot, peening . . .Embrittlement. . .Reprocessing . . .Plating thickness.Class 1. ,. ..... . .Class 2, . . . . .Class 3 . . . . .Type I plating. .Type II plating .

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    5. DETAILED REQUIREMENTS5.1 General notes. . . .5.1.1 Prior to plating .5.1.2 Baking . . . . . .5.1.3 Plating sequence .5.1.4 Storage of parts .5.1.5 Handling of parts.5.1.6 Masking. . . . . .5.1,7 Racking. . . . . ,5.2 Plating procedure. .5.2.1 Step No. 1 . . . .5.2.2 Step No. 2 . .. .5.2.3 Step No. 3 . . . .5.2.4 Step No. 4 . . . .5.2.5 Step No. 5 . . . .5.2.6 Step No, 6 . . . .5.2.7 Step No. 7 . . . .5.3 inspection . . . . .5.3.1 Pene-trant inspection5.4 Prccess controls . .. .5.5 Qualification embrittlement test5.6 Process control embrittlement acceptance--7. Analysis report. . . . . . . . . . . . . test. . .

    . . ..8 Asterisks. . . . . . . . . . . . . . . .

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    MIL-STD-i501B(USAF)

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    MILITARY STANDARECHROMIUM PLATING, LOW EMBRITTLEMENT; ELECTRODEPOSITION

    1. SCOPE*1*1 ~ ~G ~ .P This stsrid;rd covers tkis przc:si %:.2 rr,titerislsrequired for the electrodeposition of chromium on high strengthsteel substrates. Subsequent heat treating techniques needed toinsure low hydrogen embrittlement of steel are also described.1.2 Documentation. This standard meets and exceeds the require-ments of QQ-C-320 and can be used, when plating in accordance withQQ-C-320.1.3 Purpose. Chrome plating is applied for wear resistance andsuch incidental corrosion protection as the specified thickness ofthe plate may afford. Where corrosion protection is desired, anundercoat of nickel 0.0254 to 0.050$ millimeters (0.001 to0.002 in) thickness is recommended.1.4 Classification*1.4,1 ,_lasses. Chromium plating covered by this standard shallbe of the following classes:

    a. Class 1 - Crack free (see 4.8)b. Class 2 - Limited cracking allowed (see 4-.9)c. Class 3 - Moderate cracking-allowed (see 4.10)

    *NOTE: When not specified, plating.class shali be Class 3.*1.4.2. = Chrome plating covered by this standard shall beof the following types:

    a. Type 1 - Plated to specified dimensions (see 4.11)Type XI - Processed to specified dimensions after plating

    (seeb~.12)2. REFERENCED DOCUMENTS2.1 Documents. The following documents of the issue in effecton date 02 invitation for bids or request for proposal, form apart of this standard to the extent specified herein.

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    MIL-STD-1501B(USAF)SPECIFICATIONS ,

    FederalO-C-303 Chromium Trioxide, Technical0-S-809 Sulfuric Acid, TechnicalQQ-C-320 Chromium Plating (Electrodeposited)

    MilitaryMI.L-I-6866 Inspection, Penetrant, Method ofMIL-S-13165 Shot Peening of Metal PartsMIL-I-25135 Inspection Materials, PenetrantMIL-R-81841 Rotary Flap Peening of Metal Parts

    STANDARDS,Military

    MIL-STD-866 Grinding of Chrome Plated Steel,and. SteelParts Heat Treated to 180,000 PSI or OverMIL-STD-871 E.lectro-Chemical Stripping of InorganicFinishesMI.L-STD-1504 Abrasive Blast of Aircraft Components

    (Copies of specifications, standards, drawings and publicationsrequired by suppliers in connection with specific procurementfunctions. should reobtained from the procuring activity or as .,--:directed by- the contracting officer). !,,;2.2thiswisebids

    Other publications. The following documents form a part of !.standard to the extent specified herein. Unless other-indicated, the issue in effect on date of invitation foror, request for proposal shall apply.

    American Society for Testing and MaterialsASTM E8 Staridard Tension Testing of Metallic Materials

    (Applications forcopies should be address-ed to the,AmericanSociety for Testing and Materials, 1916 Race. Street,Philadelphia PA 19103).3. DEFINITIONS .

    *3.1 High strength. steel. For the purpose of this standard highstrength steel is defined as steel heat treated to 1100 mega-pascals or 112 kilograms force/millimetersand above.3.2 Material batch. All items processedplating bath.4. GENERAL REQUIREMENTS 2

    squared (180,000 psi)

    at one time through the

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    \ MIL-STD-i501B( USAF)\ ,/ w 4*1 Materials and equipment. tfaterials and equipment use~ ir.chromium plating are as follows:,4.1.1

    a.b.c.

    *4.1.2a.mav be

    MaterialsChromium Trioxide, Technical (0-C-303)Sulfuric Acid, Technical (0-S-809)Anodes7% Tin-lead; wires, rod, or strip7% Antimony-lead; wires, rod, or stripEquipmentPower source. Either generated or rectified. D.C. current

    used. Ripple value shall not exceed 10 percent as measured .by dividing the Root Mean Square of the A.C. Voltage component bythe D.C. Voltage. This can best be measured by using an RMS A.C.Voltage Meter and dividing this value by the D.C. Voltage. Thesemeasurements are to be taken across the anode and cathode bus atthe tank.

    b. Tanks. Tanks should be resistant to the operating temper-ature and the chemical environment. Tanks in,which any elec-., trolytic action takes place must be free of short circuits.L c. Temperature control. Plating tanks to be operated ati temperatures other than room temperature shall be equipped with automatic temperature indicating and z+egulating devices.

    d. Instrumentation. An ammeter shall be placed in serieswith the chromium tank cathode. The ammeter shall have suf-ficient shunts and switches to pr,ovide a full-scale readingequal to the maximum capacity of the power source,, and anaccuracy of t 5 percent of the current being measured.

    e. Blast equipment, Blast cabinets shall be located nearthe plating line. The size of the cabinet shall be adequate toenclose the parts .to be plated. Air lines shall be suitablytrapped and filtered to prevent in-process contamination of theparts to be cleaned.

    f. Bake oven. An oven capable of baking parts at 191 ~ 140celsius (375 ~ 250F] shall be located near the plating line. Thesize of the oven shall be adequate to. enclose parts to be plated.The oven shall be equipped with temperature indicating, recordingand