The primary objective of this study was to determine the cathodic disbonding behavior of several pipeline coating materials under realistic conditions and to compare the results with laboratory tests that are commonly used to evaluate CD performance of coatings. Laboratory tests were run under more realistic conditions to simulate field conditions for three types of coatings. The move toward more realistic conditions was accomplished by:-substitution of soil extract solutions for the 3% NaCl solution,-application of a lower level of polarization during the test, either -1.0 or -1.1 VÅ’ CCS instead...
The primary objective of this study was to determine the cathodic disbonding behavior of several pipeline coating materials under realistic conditions and to compare the results with laboratory tests that are commonly used to evaluate CD performance of coatings. Laboratory tests were run under more realistic conditions to simulate field conditions for three types of coatings. The move toward more realistic conditions was accomplished by:-substitution of soil extract solutions for the 3% NaCl solution,-application of a lower level of polarization during the test, either -1.0 or -1.1 VÅ’ CCS instead of Å’ 1.4 V-CCS for the standard test condition,-addition of sand to simulate a moist soil rather than a fully immersed condition,-elevated temperature to examine the effect of temperature.A standard cathodic disbondment test was run for direct comparison.