MIL-STD-870 Cadmium Plating, Low Embrittlement, ElectrodepositonThis standard covers the process and materials required for the electro-deposition of cadmium on high strength steel substrates. Subsequent heat treating techniques needed to insure low embrittlement of steel are also described. This process is not authorized for use on steel heat treated above 1.65 X 10 9 PASCALs Pa 240,000 pounds per square inch {psi} without the approval of the applicable procuring activity.

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MIL-STD-870C

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2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document; however, supersedes applicable law and regulations unless a specific exemption has been obtained.

3. DEFINITIONS

3.1 High strength steel. For the purpose of this standard, high strength steel is defined as steel heat treated to 1.24 X 109Pa (1.26 X 102kgf/mm) (1.8 X 105psi) and above.

3.2 Material batch. All items processed at one time through the plating bath.

4. GENERAL REQUIREMENTS

4.1 General. This section covers the materials and equipment required to accomplish the described process.

4.2 Materials and Equipment.

4.2.1 Materials. The use of reclaimed materials shall be encouraged to the maximum extent possible. Materials used in cadmium plating are as follows:

a. Sodium Hydroxide, flake or granulated.

b. Sodium Cyanide, plating grade (96 - 98%NaCN). c. Cadmium Ball Anodes (A-A-51126)

d. Cadmium Oxide (A-A-50800).

4.2.2 Equipment. Equipment used in cadmium plating is as follows:

a. Either generated or rectified D.C. current may be used. Ripple value shall not exceed 10 percent as measured by dividing the Root Mean Square of the A.C. voltage component by the D.C. voltage.

b. Tanks shall be resistant to the operating temperature and the chemical environment. Tanks, in which any electrolytic action is taking place, must be free of shorts.

c. Processing tanks to be operated at temperatures other than room temperature shall be equipped with automatic temperature indicating and regulating devices.

d. An ammeter shall be placed in series with the cadmium tank cathode. The ammeter shall have sufficient shunts and switches to provide a full-scale reading equal to the maximum capacity of the power source, and an accuracy of ±10 percent of the current being measured.