SAE-AMS-QQ-N-290 PDF

The requirements of the latest issue of the below specifications shall be fulfilled whenever reference is made to the cancelled AMS-QQ-N By this action, this document will remain listed in the Numerical Section of the Index of Aerospace Material Specifications, noting that it has been superseded by the specifications as shown below. Cancelled specifications are available from SAE. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user. SAE invites your written comments and suggestions. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE.

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The requirements of the latest issue of the below specifications shall be fulfilled whenever reference is made to the cancelled AMS-QQ-N By this action, this document will remain listed in the Numerical Section of the Index of Aerospace Material Specifications, noting that it has been superseded by the specifications as shown below.

Cancelled specifications are available from SAE. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user. SAE invites your written comments and suggestions. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE.

Military Specification QQ-NA and contains only minor editorial and format changes required to bring it into conformance with the publishing requirements of SAE technical standards. The initial release of this document is intended to replace QQ-NA. Any part numbers established by the original specification remain unchanged. TSB rules provide for a the publication of portions of unrevised government specifications and standards without consensus voting at the SAE Committee level, and b the use of the existing government specification or standard format.

Under Department of Defense policies and procedures, any qualification requirements and associated qualified products lists are mandatory for DOD contracts. Grade A - 0. Test Method St. The materials used shall be such as to produce platings which meet the requirements of this specification.

RJ—dg [? Other basis metals shall be cleaned by methods which shall not damage the substrate and shall not interfere with adhesion of the deposit see 6. Class 1 plating shall be applied over an underplating of copper or yellow brass on zinc and zinc based alloys. In no case, shall the copper underplate see 3. Class 1 processing: Parts for Class 1 deposition shall be plated to specific dimensions as specified see 3.

When specified, parts shall be processed in accordance with procedural instructions for form of nickel deposit see 6. U : u"T? CALSS 1—? When specified, parts shall be processed in accordance with procedural instructions of the procuring activity see 6.

Boundaries: Boundaries of Class 2 plating which cover only a portion of the surface shall be free from beads, nodules, jagged edges and other irregularities. OUN z. W m lC40b f??? The baked parts, when tested in accordance with 4.

Plated springs and other parts subject to flexure shall not be flexed prior to the hydrogen embrittlement relief treatment. All other surfaces which cannot be touched by the 0. Unless otherwise specified, the minimum nickel plating for copper and copper alloys shall be Grade D. If the maximum thickness for Grade A is not specified in the contract, order or applicable drawing, the thickness shall not exceed 0.

Underplate: When an underplate is employed see 3. The thickness of the underplate shall not be used in the determination of the specified nickel plating thickness.

Minimum thickness of class 1 nickel plating : 0. If a thickness is not specified, it shall be 0. In no case, shall the minimum nickel plating thickness be less than 0. The thickness requirement for Class 2 plating shall apply after all metal finishing operations have been completed.

Adhesion: The adhesion of the nickel plating and any undercoat or nickel layers shall be such that when examined at a magnification of approximately 4 diameters, neither the nickel plating, any layers of nickel plating nor any electrodeposited undercoat shall show separation from the basis metal or from each other at their common interface s when subjected to the test described in 4.

The interface between a plating and the basis metal is the surface of the basis metal before plating. The formation of cracks in the basis metal or plate which do not result in flaking, peeling or blistering of the plate shall be considered as conformance to this requirement.

The basis metal shall be subject to such cleaning and plating procedures as necessary to yield deposits herein specified. The plating shall show no indication or contamination or improper operation of equipment used to produce the nickel deposit, such as excessively powdered or darkened platings, build-up and other defects. The size and number of contact marks shall be at a minimum consistent with good practice.

The location of contact marks shall be in areas of minimum exposure to service environmental conditions where important to the function of the part. Superficial staining which has been demonstrated as resulting from rinsing, or slight discoloration resulting from baking operations to relieve embrittlement, as specified above see 3.

All details of workmanship shall conform to the best practice for high quality plating. Except as otherwise specified in the contract or order, the supplier may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government.

The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure that supplies and services conform to prescribed requirements.

Upon request of the procuring activity, such records shall be made available. These records shall be maintained for not less than one year after completion of the contract or purchase order. When specified by the procuring activity see 6.

Preproduction control: For preproduction control four round notched steel specimens shall be prepared in accordance with 4. Specimens shall be heat treated to the maximum tensile strength representing production usage. The specimens shall be given the same pre-treatments, proposed for production. The specimens shall be subject to test detailed in 4.

The process shall be considered satisfactory if all specimens show no indication of cracks or failure. The test results and production control information shall be submitted to the procuring activity for approval. Until approval has been received, parts shall not be plated. Frequency of tests: To assure continuous control of the process as required by MIL-S and to prevent detrimental hydrogen embrittlement during production, the satisfactory behavior of specimens, prepared and tested in accordance with Table II, shall be made once each month or more frequently if required by the procuring activity.

The results of tests made to determine conformance of electrodeposited platings to all requirements of this specification for definite contracts or purchase order are acceptable as evidence of the properties being obtained with the equipment and procedures employed. Production control tests and specimens 4. Specimens for the production control embrittlement relief test shall be four round notched steel specimens of alloy steel conforming to QQ-S, heat treated to the maximum tensile strength, from one or more heats, and prepared in accordance with 4.

Quality conformance inspection: Lot: A lot shall consist of plated articles of the same metal composition, class and grade plated and treated under the same conditions and approximately the same size and shape submitted for inspection at one time. Sampling for visual examination and non destructive tests: Sampling for visual examination and non destructive tests shall be conducted as directed by the procuring activity see 6.

The lot shall be accepted or rejected according to the procedures in 4. Sampling for visual examination and nondestructive tests 4. If the number of non conforming articles exceeds the acceptance number for the sample, the lot represented by the sample shall be rejected.

Thickness of plating nondestructive tests : Samples selected in accordance with 4. The part of article shall be considered nonconforming if one or more measurements fail to meet the specified minimum thickness.

If the number of defective items in any sample exceeds the acceptance number for the specified sample, the lot represented by the sample shall be rejected. Separate specimens see 4. Sampling for destructive tests: A random sample of four plated parts or articles shall be taken from each lot for each destructive test or separately plated specimens shall be prepared in accordance with 4.

If the number of articles in the lot is four or less, the number of articles in the sample shall be specified by the procuring activity see 6. Thickness of plating destructive tests : If sampling and testing for thickness of plating by nondestructive testing is not the option of the supplier, samples selected in accordance with 4.

If the plating thickness at any place on any article or specimen is less than the specified minimum thickness, the lot shall be rejected. Failure of one or more of the test pieces shall constitute failure of the lot. Hydrogen embrittlement relief destructive tests : Unless otherwise specified in the contract or order, conformance to the requirements of 3. A random sample of four plated articles shall be taken from each lot or four specimens, prepared in accordance with 4.

When tested as specified in 4. Failure of one or more of the test pieces shall reject the lot. Quality conformance specimen preparation: When the plated articles are of such form, shape, size and value as to prohibit use thereof, or are not readily adaptable to a test specified herein, or when destructive tests of small lot sizes are required the test shall be made by the use of separate specimens plated concurrently with the articles represented.

The separate specimens shall be of a basis metal equivalent to that of the articles represented. For example, a coldrolled steel surface should not be used to represent a hot-rolled steel surface.

Due to the impracticality of forging or casting separate tests specimens, hot-rolled steel specimens may be used to represent forged and cast-steel articles. The separate specimens may be also cut from scrap castings when ferrous alloy castings are being plated.

These separate specimens shall be introduced into a lot at regular intervals prior to the cleaning operations, preliminary to plating, and shall not be separated therefrom until after completion of plating.

Conditions affecting the plating of specimens including the spacing, plating media, residual air pressure, temperature, etc. Separate specimens shall not be used for thickness measurements, however, unless the necessity for their use has been demonstrated. Specimens for thickness and adhesion tests: If separate specimens for thickness and adhesion tests are required, they shall be strips approximately 1 inch wide, 4 inches long and 0.

Specimens for embrittlement relief: Separate specimens for embrittlement relief test shall be round notched specimens with the axis of the specimen load direction perpendicular to the short transverse grain flow direction.

Specimens shall have a 60 degree V-notch located approximately at the center of the gage length. The vee shall have a 0. Thickness: For nondestructive measuring of plating thickness, procedures in accordance with Federal Test Method Standard No. At the option of the supplier other instruments, such as those employing the principle of beta-radiation back scatter or X-ray spectrometry may be used.

Alternately the article or specimen may be clamped in a vise and the projecting portion bent back and forth until rupture occurs. Parts such as spring pins, lock rings, etc.

The selected samples shall be subjected to a sustained tensile load equal to percent of the maximum design yield load for which the part was designed. Parts which require special fixtures, extreme loads to comply with the above requirements, or where the maximum design yield load is not known, may be represented by separate specimens prepared in accordance with 4.

The notched specimens shall be subject to a sustained tensile load equal to 75 percent of the ultimate notch tensile strength of the material.

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