مهندسی متالورژی

مهندسی متالورژی

بررسی نقش لایه‌های محافظ تشکیل‌شده توسط SDS بر پایداری الکتروشیمیایی آلیاژ منیزیم AZ31: مطالعه عملکرد الکتروشیمیایی و رفتار جذب

نویسندگان
دانشگاه فردوسی مشهد
10.22076/me.2026.743082
چکیده
در این پژوهش، تأثیر بازدارنده سدیم دودسیل سولفات‌ (SDS) بر رفتار خوردگی آلیاژ منیزیم AZ31 در محلول NaCl ‎0.01 M مورد بررسی قرار گرفت. آزمون‌های پلاریزاسیون پتانسیودینامیک (PDP) و امپدانس الکتروشیمیایی (EIS) نشان دادند که افزایش غلظت SDS، موجب کاهش چشمگیر جریان خوردگی و افزایش مقاومت پلاریزاسیون می‌شود؛ به‌گونه‌ای که نمونه حاوی ‎10 mM‎ بازدارنده، بالاترین کارایی حفاظتی را ارائه داد. تحلیل نمودارهای نایکوئیست بیانگر تشکیل لایه‌ای پایدارتر و یکنواخت‌تر بر روی سطح آلیاژ در حضور بازدارنده است. همچنین بررسی ایزوترم جذب لانگمویر و محاسبه انرژی آزاد جذب نشان داد که مکانیزم غالب، جذب فیزیکی-شیمیایی مولکول‌های SDS بر سطح آلیاژ است. نتایج بیانگر آن است که SDS می‌تواند بازدارنده‌ای مؤثر برای کاهش خوردگی آلیاژ AZ31 در محیط‌های کلریدی باشد.
کلیدواژه‌ها

عنوان مقاله English

Investigating the Role of Protective Layers Formed by SDS on the ElectrochemicalStability of AZ31 Magnesium Alloy: A Study of Electrochemical Performance andAdsorption Behavior

نویسندگان English

Ali Talebi
Erfan Fazeli
Ghasem barati darband
Mashhad University
چکیده English

In this study, the inhibitory effect of sodium dodecyl sulfate (SDS) on the corrosion behavior of the AZ31 magnesium
alloy in 0.01 M NaCl solution was investigated. Potentiodynamic polarization (PDP) and electrochemical impedance
spectroscopy (EIS) tests showed that increasing the SDS concentration significantly decreased the corrosion current
and increased the polarization resistance, such that the sample containing 10 mM of the inhibitor exhibited the highest
protective efficiency. Analysis of the Nyquist plots indicated the formation of a more stable and more uniform layer on
the alloy surface in the presence of the inhibitor. Furthermore, examination of the Langmuir adsorption isotherm and
calculation of the adsorption free energy showed that the dominant mechanism is the physicochemical adsorption
of SDS molecules on the alloy surface. The results indicate that SDS can be an effective inhibitor for reducing the
corrosion of the AZ31 alloy in chloride environments.

کلیدواژه‌ها English

AZ31 magnesium alloy
sodium dodecyl sulfate (SDS)
electrochemical impedance spectroscopy (EIS)
Langmuir adsorption isotherm
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  • تاریخ دریافت 08 اسفند 1403
  • تاریخ پذیرش 22 شهریور 1404