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Cadmium Plating

What is AMS 2400 | Cadmium Plating? 

Each plating or metal finishing process has its own correlated spec(s).  Specs are especially useful when working with our clients in the highly specialized Aerospace Manufacturing Industry. With no room for error, it is essential that AOTCO is diligent when following these specs.  

Cadmium plating commonly uses spec AMS 2400. The aerospace engineering standard for cadmium plating, AMS 2400 indicates thickness, temperature, and process requirements. 

Benefits of AMS 2400 Cadmium Plating 

  • Oxidation Resistant  

  • Corrosion Resistance  

  • Adjustable Thickness  

  • Natural Lubricity 

  • Low Surface Friction 

Technical Specs For AMS-2400

Purchase order MUST contain the following

  • AMS2400X

  • Plating thickness desired

  • Basis metal to be plated

  • Tensile strength or hardness of the basis metal

  • Pre-plate stress relief to be performed by plating processor (time and temperature)

  • Special features, geometry or processing present on parts that requires special attention by the plating processor

  • Hydrogen embrittlement relief to be performed by plating processor (parameters or reference document)

  • Minimum thickness on internal surfaces, if required.

  • Optional: Periodic testing frequency and sample quantity

  • Quantity of pieces to be plated

Stress Relief Treatment

All steel parts having a hardness of 36 HRC and above and that are machined, ground, cold formed or cold straightened after heat treatment shall be cleaned to remove surface contamination and thermally stress relieved before plating. Temperatures to which parts are heated shall be such that maximum stress relief is obtained while still maintaining hardness of parts within drawing limits. Unless otherwise specified, the following treatment temperatures and times shall be used:

For parts, excluding nitrided parts, having a hardness of 55 HRC and above, including carburized and induction hardened parts, stress relieve at 275 °F ± 25 (135 °C ± 14) for 5 to 10 hours.

For parts having a hardness less than 55 HRC, stress relieve at 375 °F ± 25 (191 °C ± 14) for a minimum of 4 hours. Nitrided parts fall into this category. Higher temperatures shall be used only when specified or approved by the cognizant engineering organization.

For peened parts: If stress relief temperatures above 375 °F (191 °C) are elected, the stress relieve shall be performed prior to peening or the cognizant engineering organization shall be consulted and shall approve the stress relief temperature.

Treatment of steel parts shall be in accordance with AMS2759/9. except all parts plated per this specification HRC 36 and higher shall be baked.

ams 2400 2-1

The chromic acid post treatment will not typically improve corrosion resistance as much as the chromate post treatment and will not impart a distinct color on the part.

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Serving Our Nation’s Aerospace Firms with the Highest Quality Plating

Services & Capabilities

Plating Substrates
Pre- & Post-Process Treatments
Dedicated Outsourced Finishing



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Sometimes called a “conversion coating” Anodizing is an electrolytic process in which an oxide (anodic) layer is chemically built on the surface of the substrate material, providing anti-corrosion and other benefits. AOTCO offers, Type I, Type 2, Type 3 and Titanium anodizing services.

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Passivation is a term for a variety if processes that make a metal (most commonly stainless steel) or other substance unreactive, or passive, by altering the surface layer or coating the surface with a thin inert layer. AOTCO performs both citric and black oxide passivation techniques to a range of specifications.

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Plating Substrates

Plating Substrates

AOTCO plates on a wide variety of Common, Exotic and Non-Metallic substrates, bringing exceptional expertise to magnesium, titanium, beryllium, BeCu, TeCu, tungsten and more. In some cases we pass as high as 450 degrees celsius, allowing for high temperature soldering, brazing, or post machining operations after plating.

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Pre- & Post-Process Treatments

Pre- & Post-Process Treatments

Pre-Process: In addition to offering both mechanical & chemical cleaning options, AOTCO specializes in creating solutions for complicated, difficult and tight-tolerance masking challenges. Post-Process: For clients with specialized needs AOTCO offers laser marking and engraving options, including color change caused by chemical or molecular changes, charring, foaming, melting, ablation, and more.

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Dedicated Outsourced Finishing

Dedicated Outsourced Finishing

Part of our cornerstone goal of building long-term, collaborative & solution-oriented partnerships, AOTCO will devote reserved physical and human resource capacity for our clients with long-term finishing and deadline requirements. For these partnerships our commitment is that AOTCO manages the process, while YOU control the results.

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