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Testing methods for ED coatings and paint film properties
dgkede
2025-05-13
1. Electrophoretic coatings - Determination of original paint, working fluid and application performance
1. 7. Coulombic efficiency measurement method
（1） Measurement steps
1. Adjust the electrophoretic paint, working solution or tank solution to the standard working state;
2. After numbering the test samples, accurately weigh the weight of the samples (accurate to 0.001 grams) and record it as W0;
3. Connect the coulomb meter string to the DC power circuit and turn on the coulomb meter power switch;
4. Connect the template and electrode plates, maintaining a pole spacing of (80-100) mm. At this time, the tank solution should be under the construction conditions specified for the electrophoretic coating product. Connect the power supply and raise the voltage to the construction voltage within (0-15) seconds. Press the stopwatch to time and electrophorese for (2-3) minutes. After cutting off the power supply, record the coulomb value (C) indicated on the coulomb meter, and then return the coulomb value of the coulomb meter to zero;
5. After drying the paint film according to the material standard conditions, the paint film is cooled to room temperature in a dryer. Then accurately weigh the mass of the sample on the balance (accurate to 0.001 grams) and record it as W.
6. The thickness of the paint film on the measurement sample must meet the technical requirements, and the above measured data is considered valid. Otherwise, the test will be repeated
The hardness, flexibility, and impact resistance of the ED coating are crucial for its durability. Hardness is typically determined using an indentation test, such as the Knoop or Vickers method. Bend testing assesses flexibility, while impact resistance is evaluated using an impact tester that measures the energy required to cause coating failure.REPORT