Influence of the Morphology of Eutectoid Steels on Corrosion Resistance in NaCl Aqueous Medium with and without CO<sub>2</sub>
Francisco Felipe de M. Fideles,
Mauro Andres C. Florez,
Maria Veronica G. Rodrigues,
Jorge Luiz Cardoso,
Clodualdo Aranas,
Samuel F. Rodrigues,
Marcos Natan da S. Lima,
Caio Victor P. Pascoal,
Thiago Alves de Moura,
Gedeon S. Reis,
Eden S. Silva,
Hamilton F. Gomes de Abreu
Affiliations
Francisco Felipe de M. Fideles
Materials Characterization Laboratory (LACAM), Department of Metallurgical and Materials Engineering, Federal University of Ceará, Campus Do Pici, Bloco 729, Fortaleza 60020-181, Brazil
Mauro Andres C. Florez
Materials Characterization Laboratory (LACAM), Department of Metallurgical and Materials Engineering, Federal University of Ceará, Campus Do Pici, Bloco 729, Fortaleza 60020-181, Brazil
Maria Veronica G. Rodrigues
Graduate Program in Materials Engineering, Federal Institute of Education, Science and Technology of Maranhão, São Luís 65075-441, Brazil
Jorge Luiz Cardoso
Materials Characterization Laboratory (LACAM), Department of Metallurgical and Materials Engineering, Federal University of Ceará, Campus Do Pici, Bloco 729, Fortaleza 60020-181, Brazil
Clodualdo Aranas
Mechanical Engineering, University of New Brunswick, Fredericton, NB E3B 5A3, Canada
Samuel F. Rodrigues
Materials Characterization Laboratory (LACAM), Department of Metallurgical and Materials Engineering, Federal University of Ceará, Campus Do Pici, Bloco 729, Fortaleza 60020-181, Brazil
Marcos Natan da S. Lima
Materials Characterization Laboratory (LACAM), Department of Metallurgical and Materials Engineering, Federal University of Ceará, Campus Do Pici, Bloco 729, Fortaleza 60020-181, Brazil
Caio Victor P. Pascoal
Corrosion Research Laboratory (LPC), Department of Metallurgical and Materials Engineering, Federal University of Ceará, Campus Do Pici, Bloco 729, Fortaleza 60020-181, Brazil
Thiago Alves de Moura
Analytical Center, Physics Department, Federal University of Ceará, Campus Do Pici, Bloco 928, Fortaleza 60020-181, Brazil
Gedeon S. Reis
Graduate Program in Materials Engineering, Federal Institute of Education, Science and Technology of Maranhão, São Luís 65075-441, Brazil
Eden S. Silva
Graduate Program in Materials Engineering, Federal Institute of Education, Science and Technology of Maranhão, São Luís 65075-441, Brazil
Hamilton F. Gomes de Abreu
Materials Characterization Laboratory (LACAM), Department of Metallurgical and Materials Engineering, Federal University of Ceará, Campus Do Pici, Bloco 729, Fortaleza 60020-181, Brazil
This study conducts a comparative electrochemical evaluation of three types of pearlitic steels used in flexible pipelines for oil transport in marine environments. The steels have been manufactured with chemical composition and geometry variations to optimize operation performance under adverse conditions. Electrochemical tests were conducted using solutions simulating marine environments with NaCl and CO2, and at high temperatures. The results indicated that spheroidized (SC) steel demonstrated the best corrosion resistance under these specific conditions. Additionally, the Raman spectroscopy characterization technique was used to analyze the layers of corrosion products formed during the tests, identifying the presence of FeCO3 (siderite) and other corrosive oxides. These discoveries are valuable for selecting and improving materials in flexible pipelines used in oil production in marine waters. The study highlights the importance of the cementite morphology present in pearlite as a relevant factor in the corrosive behavior of steels, contributing to the development of more efficient and durable solutions for the offshore oil and gas industry.
