MIL-STD-163 Steel Mill Products Preparation For Shipment And Storage (S/S By Astm-A700)This CID covers a water borne, cathodic epoxy electrodeposition primer (herein after referred to as primer) intended for use on cleaned and pretreated steel, galvanized steel, and aluminum. The primer meets solvent emission maximums of 1.2 pounds per gallon (lbs/gal) (143.8 grams per liter (g/L)) of volatile organic compounds.

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A-A-52474B

corrosion resistance requirements of the contract. Unless otherwise specified, test panels shall be 4 x 12 in. (10.2 x 30.5 cm).

2.6.1 Adhesion. Several primed panels shall be topcoated with a chemical agent resistive coating (CARC) paint to a minimum dry film thickness of 1.8 mils (45.7 microns) and allowed to air dry seven days. The primed panels and primed, topcoated panels shall perform as follows:

a. The primer film shall not show any removal from the surface of the panels when subjected to ASTM D3359, method B, classification 5B.

b. The primer film and topcoat shall show no more than 5% removal from the surface when subjected to ASTM D3359, method B, classification 4B.

c. The primer film, with and without topcoat, shall achieve a rating of 10 when subjected to ASTM D6677.

2.6.2 Flexibility. An aluminum panel shall be used to determine the flexibility of the primer when subjected to ASTM D522, method B, using a 0.25 in. (6.4 mm) mandrel. The primer film shall show no cracking or flaking. Cracks occurring at either end and extending no more than 0.25 in. (6.4 mm) shall be disregarded.

2.6.3 Salt spray resistance. Three panels of each substrate shall have two intersecting lines scribed across the surface of each panel so that the bare substrate is exposed. The edges of all panels shall be sealed. The panels shall then be subjected to 5% salt spray for 1000 hours as described in ASTM B117. After being subjected to the salt spray, the panels shall be washed free of salt and examined immediately for the following:

a. One panel from each substrate shall be checked for adhesion in accordance with ASTM D3359, method B, classification 3B.

b. One panel from each substrate shall be stripped down mechanically. The panel shall show no more then a trace of rusting, pitting, corrosion or blister larger then 0.39 in. (0.99 cm). For visual inspection the use of ASTM D610, number 8, shall be used.

c. The crossed scribed area shall not exceed 0.13 in. (0.33 cm) score rust creeping on either side of the scribe line or loss of adhesion.

d. There shall be no more than 5 scattered blisters with none larger than 0.04 in. (1 mm).

2.6.4 DS2 resistance. Place two spots of DS2 agent on a primed steel panel and let stand uncovered for 30 minutes. Thoroughly wash with cool water. The primer shall show no signs of blistering or wrinkling. After drying, there shall be no film softening of the primer. The DS2 agent shall consist of the following:

- 70% diethylenetriamine

- 28% ethylene glycol monomethyl ether

- 2% sodium hydroxide

2.6.5 Throw power. In determining the throw power of the primer bath, 4 x 18 in. (10.2 x 45.7 cm) steel panels shall be used. A throw power box shall be assembled by securing two metal