THE DESIGN AND MANUFACTURE OF HIGH TEMPERATURE ELECTROCHEMICAL CELLS AND THE STUDY OF API 5L X-65 STEEL PIPE CORROSION RESISTANCE IN CO2 AND SODIUM CHLORIDE ENVIRONMENT

• Main Author: Aulia Mulyadi, Fahmi
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/50397
• Institution: Institut Teknologi Bandung

Carbon steel is often used as a pipe to transport crude oil from the upstream to the downstream sectors in the oil and gas industry. It is known for being economically efficient in a large scale. The type of the used carbon steel is 5L X-65 which refers to the API (American Petroleum Institute) standard. This steel is affordable with a good ductility and weldability quality. However, this steel has a poor corrosion resistance, especially in corrosive environments with corrosive agents such as dissolved Sodium Chloride (NaCl) and Carbon Dioxide (CO2). Environmental parameters such as temperature, pH, and chloride ion concentration also affect the corrosion resistance of X-65 steel in a NaCl-CO2 environment. In this study, the design and manufacture of electrochemical cells for corrosion testing at high temperatures and the API 5L X-65 Steel Pipe Corrosion Resistance in NaCl-CO2 Environment were conducted through a literature study. Furthermore, it was found that the common corrosion occurring in the NaCl-CO2 environment was local corrosion, with a high potential area occurs in the internal part of the pipe, in the elbow area, and in the weld bead which was affected by several parameters such as temperature, NaCl concentration, and pH. A Variation of pH and temperature parameters affects the rate of catodic reaction, while a variation of NaCl concentration affects the rate of anodic reaction. Those parameters affect the formation and morphology of FeCO3 corrosion products on the steel surface. In addition, this study also recommended the design and manufacture of electrochemical cells for corrosion testing at high temperatures.