摘要
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)^(−).
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。
基金
financial support from the National Natural Science Foundation of China (No. 52171077)。
