铝合金表面电偶腐蚀与电子功函数的关系

doi:10.3866/PKU.WHXB201312272

Abstract

Abstract:

Al alloys contain some secondary phases to improve their properties. These secondary phases have different potentials to the Al matrix, which greatly affect the localized corrosion of Al alloys. In order to reveal the physical nature of Al alloy corrosion, we use the first-principles method based upon density functional theory to calculate the work function of the main secondary phases (Al₂Cu, Al₃Ti, and Al₇Cu₂Fe). The difficulty of electrons escaping from various crystal planes was analyzed, and the potential difference between the secondary phases and Al matrix was obtained. We find that different crystal planes exposed to the outmost layer significantly impacted on the potential difference. Different atomic types at the outmost layer play different roles in Al alloy corrosion, even for the same crystal surface. The causes of galvanic corrosion were thus revealed.

Key words: Al alloy, Second phase, Electronic work function, Galvanic corrosion, First-principles

MSC2000:

O647

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WANG Jian, WANG Shao-Qing. Correlation between Galvanic Corrosion and Electronic Work Function of Al Alloy Surfaces[J].Acta Phys. -Chim. Sin., 2014, 30(3): 551-558.

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Correlation between Galvanic Corrosion and Electronic Work Function of Al Alloy Surfaces

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