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On the Mechanism of Intergranular Corrosion of Aluminum Alloys |
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15.12.2008 г. |
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On the Mechanism of Intergranular Corrosion of Aluminum Alloys V. S. Sinyavskii, V. V. Ulanova, and V. D. Kalinin OAO All-Russian Institute of Light Alloys, ul. Gorbunova 2, Moscow, 121596 Russia e-mail:
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Received November 28, 2003 Abstract — It is found that intergranular corrosion can proceed on aluminum alloys in either of two forms. The first is characteristic of low-alloy or pure aluminum; it is called crystallographic and is controlled by recrystallization process. High-angle boundaries of growing recrystallized grains accumulate numerous vacancies which partly coagulate. This causes thermodynamical instability of the boundaries, and their electrode potential approaches the potential of active corrosion. The second form characteristic of medium- or high-alloy alumi-num is called structure-decomposition and is controlled by peculiarities of the decomposition of supersaturated solid solutions.
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