[Uniformity of Tail Coating] Take an appropriate amount of this product, place it in a bright natural light, and visually inspect it. The surface of the aluminum tube tail coating should be uniform and flow hanging. 【 Sealing 】 Take an appropriate amount of this product, install a cap, and immerse it in water at 10 ℃~30 ℃. The end of the tube should be about 10mm away from the water surface. Then, use a conical filler to apply an air pressure of 0.2MPa at the open end of the tube. Within 5 seconds, the aluminum tube that has penetrated into the water should not leak. Connect the power supply of the internal coating continuity test instrument, as shown in Figure 2, and the red indicator light on the panel will light up. Press the verification button to verify the circuit; Press and hold the verification button continuously, while setting the range selection switch to 5, 50, or 500mA respectively. Adjust the instrument to ensure that the pointer deflection is within 10% of 1.8180mA. Separate verification button, instrument verification completed. To protect the instrument and avoid overload, set the range selection switch to 500mA at the beginning of the reading. Take an appropriate amount of this product, screw on the cap, and inject the test solution (weigh 10g of copper sulfate crystals, 0.05g of sodium succinate dioctate sulfate, add 0.5ml of glacial acetic acid, and add to 1000ml) into the aluminum tube until it is 10mm away from the opening. Install the nozzle and shoulder of the aluminum tube into the V-shaped groove of the base electrode, and slide the sliding electrode downwards into the aluminum tube. Adjust the height of the sliding cone to keep the aluminum tube coaxial with the swinging electrode. Press the test button and determine the appropriate test range as soon as possible. Read the data after 5 seconds. The same test solution should not be used more than eight times. The current display should not exceed 40mA.
1- Ammeter (2.5 level); 2-- Power on indicator light; 3-- Fuse (60mA); 4- On/off and range selection switch; 5- Swing electrode; 6- Sliding electrode; 7- V-shaped groove bottom electrode; 8-- Power cord; 9- Verification button; 10-- Test button; 11- Fuse (500mA); 12-- Instrument adjustment screw Figure 2 Internal Coating Continuity Tester [Chemical stability of inner coating] Take an appropriate amount of this product, level it longitudinally along the tube, and gently wipe the inner coating 30 times with a degreased cotton ball dipped in acetone. The layer should not peel off.
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