  
A 4" by 4" plate from each sample is used to test the coating for resistance to disbonding under electrical stress at elevated temperature. A 3 percent NaCl solution and a potential of 3.5 DC volts (reference calomel electrode) is impressed through a 3 millimeter drilled holiday. Electrolyte solution temperature is maintained at 150 degrees Fahrenheit for 24 hours. After the test period, radial cuts are made through the coating at a point 45 degrees from the edge of the holiday. The radius of disbondment is measured by inserting the knife point under the coating to "flick" the coating until a definite resistance to this levering action can be noted. |
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Bayou Coating LLC
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