Mechano-electrochemical interaction of high-strength pipeline steels with Al-Ti deoxidization and Mg-Ca compound treatment
作者
单位
1 The State Key Laboratory of Refractories and Metallurgy、Wuhan University of Science and Technology、Wuhan、Hubei、430081、China 2 Hubei Engineering Technology Research Centre of Marine Materials and Service Safety、Wuhan University of Science and Technology、Wuhan、Hubei、430081、China Science、Engineering and the Built Environment、Deakin University、VIC 3216、Australia
关键词
收录来源
International Corrosion Congress · 第22届国际腐蚀大会
摘要
The micro -zone interface of inclu sions with the steel matrix of X70 high - strength pipeline steel with Al-Ti deoxidization and Mg-Ca compound treatment in the tropical marine environment was investigated. Results revealed that the Volta potential difference increased in proportion to the r esidual stress at the interface of inclusions with the steel matrix. The early corrosion behavior of pipeline steel was investigated by immersion testing and corrosion morphology assessment. Three stages of the early corrosion process of pipeline steel wer e elucidated based on micro mechano - electrochemical (M -E) interaction. Thermodynamic and kinetic models of M-E interactions at the micro-scale were proposed.