SAE AMS 2424E pdf download

SAE AMS 2424E pdf download.Plating,NickelLow-Stressed Deposit.
1.1 Purpose:
This specification covers the engineering requirements for electrodeposition of a low-stressed nickel and the properties of the deposit.
1.2 Application:
This process has been used typically to provide moderate corrosion and oxidation resistance to parts which may operate in service at moderately elevated temperatures, where low tensile stress in the deposit is required to avoid marked reduction of fatigue strength, but usage is not limited to such applications.
1.3 Safety – Hazardous Materials:
While the materials, methods, applications, and processes described or referenced in this specification may involve the use of hazardous materials, this specification does not address the hazards which may be involved in such use. It is the sole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous mateiials and to take necessary precautionary measures to ensure the health and safety of all personnel involved.
2. APPLICABLE DOCUMENTS:
The issue of the fotiowing documents in effect on the date of the purchase order forms a part of this specification to the extent specified herein. The supplier may work to a subsequent revision of a document unless a specific document issue is specified. When the referenced document has been cancelled and no superseding document has been specified, the last published issue of that document shall apply.
3,2 Procedure:
3.2.1 Parts shall be plated by electrodeposition of nickel from a sulfamate solution or other suitable plating solution containing no addition agents, including stress-reducing agents, which might have a detrimental effect on properties of the plate or of the basis metal. The addition of organic wetting agents for the purpose of lower surface tension and to avoid gas-pitting is permitted. Except as permitted by 3.2.1.1, nIckel shall be deposited directly on the basis metal without a prior flash coating of metal other than nickel.
3.2.1.1 on aluminum, magnesium, beryllium, and their alloys, and corrosion-resistant steels or similarly passive matenals, a preliminary chemical coating, immersion plate, or metal flash is permissible.
3,2.2 Spotting in is not permitted.
3.3 Hydrogen Embrittlement:
After plating, rinsing, and drying, ferrous parts shall be treated in accordance with AMS 275919.
3.4 Properties:
Thedeposited nickel shall conform to the following requirements except that the requirements of 3.4.3, 3.4.6, and 3.4.7 shall not apply to parts plated in preparation for brazing:
3.4.1 Thickness: Shall be as specified on the drawing. Thickness shall be determined in accordance with ASTM B 487, ASTM B 499, ASTM B 504, ASTM B 530, ASTM B 568, ASTM E 376. or other method acceptable to purchaser,
3.4.1.1 Where “Nickel Flash” is specified, plate thickness shall be approximately .0001 inch (2.5 jim).
3.4.1.2 Thickness requirements apply to surfaces that can be touched by a sphere 0.75 inch (19 mm) in diameter. Other areas, such as surfaces of holes, recesses, internal threads or contact areas of parts plated all over, where a controlled deposit cannot be obtained under normal plating conditions, shall show evidence of plating.
3.4.1.2.1 This requirement will be satisfied for carbon and low-alloy steels if such surfaces show no film of copper after being immersed in a solution containing 4 grams CuSO4 5H20, 10 grams H2S04 (sp. gr. 1.84), and 90 mL distilled or deionized water for not less than six minutes at room temperature.
3.4.1.2.2 If internal surfaces are required to be plated to meet a thickness requirement, the drawing shall so specify.
3.4.2 Hardness: Shall be not higher than 300 HV. or equivalent, determined in accordance with ASTM E 92 on deposits 0.005 inch (0.13 mm) and over in thickness.
3.4.3 Residual Stress: Shall be within the range 5 ksi (34.5 MPa) in compression to 15 ksi (103 Mpa) in tension, determined on specimens having plate thickness of 0.0003 inch (7.6 )Am) or greater, determined in accordance with ASTM B 636 or other instrument acceptable to purchaser.
3.4.4 Adhesion: Shall conform to one of the following:
3.4.4.1 SpecImens, as in 4.3.3. shall not show separation of the plate from the basis metal, when examined at approximately4X magnification, after being bent approximately 180 degrees around a diameter equal to twice the thickness of the specimen. Formation of cracks which do not result in flaking or blistering of the plate is acceptable.