SAE AMS 2424E:2003 pdf download

SAE AMS 2424E:2003 pdf download Plating, Nickel Low-Stressed Deposit
1. SCOPE:
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 materials and to take necessary precautionary measures to ensure the health and safety of all personnel involved.
2. APPLICABLE DOCUMENTS: The issue of the following 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. TECHNICAL REQUIREMENTS:
3.1 Preparation:
3.1.1 Steel parts having hardness higher than 40 HRC and which have been ground after heat treatment shall be cleaned to remove surface contamination and suitably stress-relieved before preparation for plating. Temperatures to which parts are heated shall be such that maximum stress relief is obtained without reducing hardness of parts below drawing limits, but, unless otherwise specified, not less than 275 °F (135 °C) for not less than five hours for parts having hardness of 55 HRC or higher or not less than 375 °F (191 °C) for not less than four hours for other parts.
3.1.2 Parts shall have clean surfaces, free from waterbreak, prior to immersion in the plating solution.
3.1.3 Except for barrel plating, electrical contact points shall be as follows. For parts which are to be plated all over, locations shall be acceptable to purchaser, for parts which are not to be plated all over, locations shall be in areas on which plating is not required.
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.