بررسی اثر بازدارنده خوردگی هیبریدی آلی برگ درخت کنار و سولفات روی بر فولاد کم‌کربن در محیط نمکی

محورهای موضوعی : فصلنامه علمی - پژوهشی مواد نوین

زهرا شهریاری ¹ (دکتری رشته مهندسی مواد، گروه مهندسی مواد، دانشگاه شهید چمران اهواز، اهواز، ایران)
خلیل الله قیصری ² (دانشیار، گروه مهندسی مواد، دانشگاه شهید چمران اهواز، اهواز، ایران)

تاریخ دریافت : 1401/07/20 تاریخ پذیرش : 1401/10/16 تاریخ انتشار : 1401/02/01

کلید واژه: EIS, برگ درخت کنار, بازدارنده هیبریدی ZSC/ZnSO4, ممانعت از خوردگی,

چکیده مقاله :

چکیده
مقدمه: هدف از این مطالعه ارزیابی ویژگی­های جذبی و خواص بازدارند­گی عصاره برگ­ درخت کنار (ZSC)[1] و سولفات روی (ZnSO₄) و همچنین سنتز یک بازدارنده خوردگی جدید براساس ZSC/ZnSO₄ به منظور بازدارنده­ای جهت افزایش خواص حفاظت از خوردگی فولاد کم کربن در محلول ۵/۳ درصد وزنی سدیم­کلرید می­باشد.
روش­: در این تحقیق، عصاره استخراجی از ZSC به محلول آب در ZnSO₄ اضافه شد و توسط همزن مغناطیسی[2] به مدت زمان ۴۸ ساعت مخلوط شد تا بازدارنده چندتایی تهیه گردد. مورفولوژی و شیمی بازدارنده چندگانه سنتز شده توسط میکروسکوپ الکترونی روبشی (SEM) و آنالیز وزن سنجی حرارتی (TGA) مورد بررسی قرار گرفت. اثر ضد خوردگی و بازدارنده­گی بازدارنده سنتز شده در کنترل خوردگی فولاد کربنی توسط آزمون­های طیف­سنجی امپدانس الکتروشیمیایی (EIS)، پلاریزاسیون پتانسیودینامیک و آنالیز میکروسکوپ الکترونی روبشی گسیل میدان مجهز به طیف­سنجی پراش انرژی پرتو ایکس (FE-SEM/EDS) مورد مطالعه قرار گرفت.
یافته­ها: نتایج ریزساختاری و آنالیز TGA نشان داد که بازدارنده ترکیبی ZSC/ZnSO₄ به طور موفقیت آمیزی با اشتراک گذاشته شدن جفت الکترون­های آزاد اتم­های هترو O، N و H[3] موجود در ساختار ترکیبات آلی ZSC با اوربیتال­های خالی کاتیون Zn⁺² تشکیل شده است. نتایج حاصل از آزمون­های EIS و پلاریزاسیون نشان دادند که نمونه فولادی در محلول حاوی ترکیب هیبریدی ZSC/ZnSO₄ دارای مقاومت به خوردگی بالایی بوده است.  
نتیجه­گیری: کاهش نرخ خوردگی فولاد در محلول سدیم­کلرید حاوی ZSC/ZnSO₄ نشان از اثر هم­افزایی بین ZSC و Zn⁺² بوده است که سبب کاهش واکنش­های کاتدی و آندی در سطح فولاد شده و همچنین چنگ­زدگی و جذب مولکول­های ZSC با سطح فولاد و کاتیون­های Zn⁺² و Fe⁺² که سبب رسوب فیلم­های محافظ در مکان­های آندی و همچنین رسوب  هیدروکسید روی در مکان­های کاتدی خواهد شد.  
 
 
 
 
 

چکیده انگلیسی:

.
Abstract
Introduction: This study's objectives were to investigate the inhibitory and adsorption qualities of aqueous extracts of Ziziphus spina-christi (ZSC) leaves and ZnSO₄ and to create a new generation of corrosion-inhibiting pigments based on zinc sulfate-ZSC leaf extract (ZSC/ZnSO₄) for the corrosion of mild steel in 3.5 weight percent NaCl solution.
Methods: In this study, the ZSC extract was introduced to a ZnSO4 suspension and swirled using a magnetic stirrer for 48 hours at 25 °C until the functional groups of the ZSC and ZnSO₄ interacted and a hybrid pigment was produced. Scanner electron microscopy (SEM) and thermal gravimetric analysis (TGA) techniques were used to analyze the morphology and chemistry of the produced pigments. Then, using polarization tests, electrochemical impedance spectroscopy (EIS), and FE-SEM/EDS analyses, the inhibitory impact of pigments in preventing corrosion of carbon steel in 3.5 weight percent NaCl solutions was assessed.
Findings: Results showed that the lone pair electrons of heteroatoms present in the structure of the chemical compounds of ZSC extract were successfully shared with vacant orbitals of Zn²⁺ cations to create the hybrid ZSC/ZnSO₄ pigment. Results from electrochemical experiments indicated that the ZSC/ZnSO₄ hybrid pigment could significantly slow down the corrosion of the steel sample. Both the anodic and cathodic processes were noticeably repressed and inhibited in the presence of ZSC/ZnSO₄ extract due to the synergistic impact between ZSC and Zn²⁺ cations.

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