Influence of Testing Temperature on the Corrosion Behavior of API 5L X70 Pipeline Steel

作     者：Carlos Antonio Vieira de Almeida Machado Renato Altobelli Antunes Elisabete Jorge Pessine Olandir Vercino Correa 

作者机构：Centro de Engenharia Modelagem e Ci~ncias Sociais Aplicadas (CECS) Universidade Federal do ABC Santo Andre 09210-580Brazil Centro de Ciencia e Tecnologia de Materiais (CCTM) Instituto de Pesquisas Energeticas e Nucleares(IPEN/CNEN-SP) Cidade Universitaria Sao Paulo 05508-000 Brazil 

出 版 物：《Journal of Mechanics Engineering and Automation》 (机械工程与自动化（英文版）)

年 卷 期：2014年第4卷第6期

页      面：528-532页

学科分类：0820[工学-石油与天然气工程] 080706[工学-化工过程机械] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 082003[工学-油气储运工程] 

主　　题：X70管线钢 测试温度 腐蚀行为 API 扫描电子显微镜 应力腐蚀开裂 标准材料 碳酸氢钠 

摘      要：It is known that localized corrosion attack takes a preponderant role in the onset of stress corrosion cracking of pipeline steels in high pH conditions. Carbonate/bicarbonate solutions can be employed to study the localized corrosion behavior of these materials. In addition to the presence of chloride ions in the electrolyte, the solution temperature is also of prime importance to the onset of pitting corrosion. The aim of this work is to evaluate the influence of the testing temperature on the corrosion behavior of the API 5L X70 pipeline steel which is a standard material for gas pipelines in Brazil. Samples were exposed to a solution consisting of Na 2 CO 3, NaHCO 3 and NaCl at three different temperatures: RT (room temperature), 40 oC and 60 oC. The corrosion morphology was observed using SEM (scanning electron microscopy). The results showed that pitting corrosion became facilitated when the steel was immersed at higher temperatures.