摘要
铝合金的局部腐蚀(如点蚀、晶间腐蚀以及应力腐蚀开裂)与铝基体和第二相之间的微电偶腐蚀密切相关。采用高分辨率透射电子显微镜和第一性原理计算,从微观和原子尺度上分析影响铝合金第二相腐蚀机理的因素,包括第二相的组成与结构、环境的pH值、应力以及吸附物质(如Cl^(-),H_(2)O,OH^(-)和O^(2-))的吸附行为。
Localized corrosion of aluminum(Al)alloys,such as pitting corrosion,intergranular corrosion,and stress corrosion cracking is closely related to the micro-galvanic corrosion between the second phase and the Al matrix.Using high-resolution transmission electron microscopy and first principles calculations,the factors that affect corrosion mechanisms of the second phase in Al alloys at micro-scale and atomic-scale were examined,including the composition and structure of second phase,pH of the environment,stress and adsorption behavior of adsorbates(such as Cl^(−),H_(2)O,OH−and O_(2)^(−).
作者
计元元
徐云泽
张斌斌
Yashar BEHNAMIAN
夏大海
胡文彬
Yuan-yuan JI;Yun-ze XU;Bin-bin ZHANG;Yashar BEHNAMIAN;Da-hai XIA;Wen-bin HU(Tianjin Key Laboratory of Composite and Functional Materials,Tianjin 300350,China;School of Materials Science and Engineering,Tianjin University,Tianjin 300350,China;School of Naval Architecture and Ocean Engineering,Dalian University of Technology,Dalian 116024,China;CAS Key Laboratory of Marine Environmental Corrosion and Bio-fouling,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;Department of Chemical and Materials Engineering,University of Alberta,Edmonton,Alberta T6G 2V4,Canada)
基金
financial support from the National Natural Science Foundation of China (No. 52171077)。
关键词
铝合金
腐蚀
脱合金化
第一性原理计算
Al alloys
corrosion
dealloying
first principles calculations
