The tendency of pipeline girth weld coatings to shield cathodic protection (CP) current was studied in the laboratory. Epoxy, epoxypolyurethane, polyurethane, and wax were investigated. Results showed that the liquid coatings, when applied extra thin to accelerate the kinetics of absorption and current transmission, all disbonded by blistering, and all allowed CP current to be transmitted.
This is the final series of steps for the development of external corrosion direct assessment modification set by NACE 502 SP 2008 document. This work aims to provide the modified methodology based on a case study of a buried pipeline that is 110 km (68.35 miles) in length and 457.2 mm (18in) in diameter.
Mechanical properties and microstructure of Nb-Ta-Re, Nb-Re, Nb-Pd, and Nb-Pt alloys were studied by nano-indentation measurements and X-ray diffraction. Corrosion behavior was compared by electrochemical methods, including open circuit potential measurement, potentiodynamic, and electrochemical impedance spectroscopy.
In-situ electrochemical techniques were used to investigate the effect of sulfate-reducing bacteria specie Desulfovibrio alaskensis AL1 colonization and its metabolic products on carbon steel corrosion. Open circuit potential (OCP) measurements showed a slight potential shift toward more positive values appearing just after microbial inoculations.
Organic coating systems for protection against internal corrosion of pipelines are important to maintain integrity of oil and gas infrastructure. The present investigation focuses on evaluation of protective properties of a set of multiphase coating systems in the environment encountered inside of off-shore natural gas pipelines.
An optical fiber corrosion sensor is developed to monitor the penetration of corrosion pits in steel bars. Simply made by encasing one end of an optical fiber into a steel straw. As corrosion penetrates the steel straw wall, the solution and corrosion products fill inside and contaminate the fiber end surface, resulting in a change in the reflectivity.
An investigation into the effect of ppm concentrations of acetic acid on the electrochemical corrosion behavior of API 5L X65 carbon steel in a sour environment. Electrochemical techniques, Linear Polarization Resistance (LPR), Potentiodynamic Polarization and Electrochemical Impedance Spectroscopy (EIS), were used.