MIL-STD-1503 Preparation Of Aluminum Alloys For Surface Treatment And Inorganic CoatingThis standard describes the cleaning, activation and under-plating process, and material required for aluminum and aluminum alloys prior to applying inorganic coatings. It is intended that this standard be used in conjunction with other process documents, where the technical requirements are for the application of surface treatments and inorganic coatings on aluminum and aluminum alloys.

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MIL-STD-1503C

g. Rochelle Salt

h. Sodium Bisulfate

i. Sodium Carbonate (A-A-59363)

j. Sodium Cyanide

k. Sodium Fluorosilicate l. Sodium Gluconate

m. Sodium Hydroxide (ASTM D456) n. Sodium Met silicate (ASTM D537) o. Sulphuric Acid (A-A-55828)

p. Trisodium Phosphate

q. Zinc Oxide (MIL-Z-291 - Inactive)

4.1.2 Equipment.

a. Power Source. 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. This can be measured by using RMS A.C. voltage meter and dividing this value by the D.C. voltage. These requirements are to be taken across the anode and cathode bus at the tank.

b. Tanks. Tanks should be resistant to the operating temperature and the chemical environment. Tanks in which any electrolytic action takes place must be free of short circuits.

c. Temperature Control. Plating tanks to be operated at temperature other than room temperature shall be equipped with automatic temperature indicating and regulating devices.

d. Instrumentation. An ammeter shall be place in series with the plating 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 plus or minus 10 percent of the current being measured.

e. Blast Equipment. A blast cabinet shall be located near the finishing line. Size of the cabinet shall be adequate to enclose the parts to be finished. Air lines shall be suitably trapped and filtered to prevent in-process contamination of the parts to be cleaned.