IJE TRANSACTIONS C: Aspects Vol. 31, No. 12 (December 2018) 2092-2101   

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P. Afzali, M. Yousefpour and E. Borhani
( Received: July 21, 2018 – Accepted in Revised Form: October 26, 2018 )

Abstract    In this study, a wide range of combined ageing treatments and cold work deformations in the Al 4.2 wt% Ag alloy matrix were proposed, aiming to investigate the effect of defects such as precipitates (Ag2Al plates) and dislocations on the mechanical and electrochemical behavior of Al–4.2 wt% Ag alloys. Further reductions of thickness from 10 to 60%, decreases the mean size of Ag2Al plates, along with a denser distribution. The inductive loop at lower frequencies in Nyquist plot attributed to localized corrosion that clearly testified the fluctuations of the anodic branch in the Tafel diagram and the FE-SEM images for the presence of pitting corrosion. Additionally, the pit propagation grade expands repetitively with cold work reduction and fragmentation of pre-precipitates. This was related to an extreme amount of dislocations induced by deformation and fragmented pre-precipitates, which created more preferable locations for the nucleation of pits. Furthermore, Energy Dispersive X-ray Spectroscopy of pits, revealed that the presence of Al-Ag containing particles acted as cathodic sites and caused the anodic matrix dissolution.


Keywords    Corrosion; Pitting; Al-Ag; Cold Work Deformation; Precipitation



در این مطالعه، طیف وسیعی از عملیات پیرسختی و تغییر شکل کار سرد بر روی ماتریکس زمینه آلیاژ Al 4.2 wt% Ag به منظور بررسی تاثیر عیوب از قبیل: رسوبات Ag2Al و نابجایی‌ها بر رفتار مکانیکی و الکتروشیمیایی آلیاژ مذکور انجام شد. کاهش ضخامت از 10 تا 60 درصد موجب کاهش میانگین اندازه ذرات رسوبی و توزیع چگالتر نابجایی‌ها می‌شود. حلقه‌ی القایی مربوط به فرکانس‌های پایین در نمودار نایکوییست مرتبط با خوردگی موضعی بوده که نوسانات شاخه‌ی آندی در نمودار تافل و تصاویر FE-SEM برای حضور خوردگی موضعی را ثابت می‌کنند. همچنین، میزان گسترش حفرات با کاهش بیشتر ضخامت و خرد شدن رسوبات رابطه مستقیمی دارد. این امر به دلیل میزان بالای نابجایی‌های تشکیل‌شده توسط تغییر شکل و خرد شدن رسوبات است که منجر به تشکیل سایت‌های مناسب برای جوانه‌زنی حفرات می‌شود. به علاوه، طیف‌نگاری EDS از حفرات، نشان داد که حضور ذرات شامل آلومینوم و نقره، به عنوان سایت‌های آندی و کاتدی عمل کرده و موجب انحلال و خوردگی زمینه آندی می‌شود.


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