بررسی کارایی عصاره پوست انار در حفاظت از خوردگی میلگرد در محلول شبیه‌ساز‌ بتن

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه شیمی کاربردی، دانشکده شیمی، دانشگاه گیلان، رشت، ایران، صندوق‌پستی: 1914-41635

10.30509/jcst.2025.167495.1256

چکیده

در این پژوهش، اثرات بازدارندگی عصاره پوست انار استخراج شده با آب و همچنین آب/ استونیتریل به عنوان بازدارنده خوردگی میلگرد فولادی در محیط شبیه‌ساز بتن بررسی شد. بدین منظور، اثر بازدارندگی با استفاده از روش‌های طیف‌سنجی الکتروشیمیایی، کاهش وزن و میکروسکوپ الکترونی ارزیابی شد. غلظت‌های 1، 2، 3 و 4 درصد حجمی/ حجمی از بازدارنده سبز و غلظت بهینه 4 درصد وزنی از بازدارنده کلسیم نیترات بررسی شد. نتایج نشان دادند که کارایی بازدارندگی عصاره استخراج شده در آب- استونیتریل در غلظت بهینه 3 درصد، بالاتر از بازدارنده نیترات است. نتایج امپدانس نشان داد که در حضور بازدارنده سبز، مقاومت قطبش (Rp) از (Ω.cm2) 488 در شاهد تا (Ω.cm2)8260 در بازدارنده افزایش پیدا کرد و کارایی بازدارندگی مقدار 94 درصد نسبت به نیترات (8/91 درصد) به دست آمد. نتایج SEM- EDX حاکی از تشکیل یک فیلم پیوسته از بازدارنده بر بستر فلز بود که مانع از نفوذ و جذب یون کلرید و حفظ فیلم رویین تشکیل شده بر بستر فلز می‌شود.

کلیدواژه‌ها

عنوان مقاله [English]

Investigating the Effectiveness of Pomegranate Peel Extract in Protecting Rebar Corrosion in Concrete Simulant Solution

نویسندگان [English]

  • Semaneh Fatehi Kenarsari
  • Somayeh Mohammadi
Department of Applied Chemistry, Faculty of Chemistry, University of Guilan, P.O. Box: 41635-1914, Rasht, Iran
چکیده [English]

In this research, the inhibitive effects of pomegranate peel extracted with water and a water/acetonitrile solvent as a green corrosion inhibitor of steel rebar in a concrete simulation environment are investigated. For this purpose, the inhibition effect was evaluated using spectroscopic, electrochemical, weight loss, and electron microscopy methods. Concentrations of 1, 2, 3, and 4 % by volume of the green inhibitor were investigated, and the optimal concentration was found to be 4 wt. % for the calcium nitrate inhibitor. The results showed that the inhibition efficiency of the extracted extract in water/acetonitrile at an optimal concentration of 3 % v/v was higher than that of nitrate. The impedance results showed that in the presence of the green inhibitor, the polarization resistance (Rp) increased from 488 (Ω.cm2) in the blank to 8260 (Ω.cm2) in the inhibitor, and the inhibition efficiency was 94 % compared to nitrate (91.8 %). The SEM-EDX results indicated the formation of a continuous inhibitor film on the metal substrate, which prevents the penetration and absorption of chloride ions, thus preserving the passive film on the metal substrate. 

کلیدواژه‌ها [English]

  • Pomegranate peel extract
  • Nitrate
  • Green corrosion inhibitor
  • Steel rebar
  • Concrete simulating environment

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