بررسی رفتار خوردگی فولاد نرم غوطه‌ور در محلول سدیم کلرید حاوی عصاره رنگدانه فسفات روی و بازدارنده آلی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 هیات علمی دانشگاه تهران

2 دانشگاه صنعتی امیرکبیر

چکیده

یکی از روش‌های ارتقاء عملکرد حفاظتی پوشش‌ها، استفاده از بازدارنده‌های آلی خوردگی در فرمولاسیون می‌باشد. هدف از این تحقیق، بررسی رفتار خوردگی فولاد غوطه‌ور در محلول سدیم کلرید 5/3% در حضور هم‌زمان بازدارنده آلی 2- مرکاپتوبنزایمیدازول (MBI) و پیگمنت ضد خوردگی فسفات روی (ZP) با استفاده از آزمون‌های طیف سنجی امپدانس الکتروشیمیایی (EIS) و پلاریزاسیون می‌باشد. نتایج به‌دست آمده از آزمون‌های الکتروشیمیایی طی 24 ساعت غوطه‌وری نمونه‌ها در محلول‌های مورد نظر، نشان‌دهنده برتری عملکرد حفاظتی ترکیب پیگمنت فسفات روی به‌همراه بازدارنده آلی 2– مرکاپتوبنزایمیدازول در مقایسه با فسفات روی می‌باشد. به‌طور کلی، روند تغییرات زمانی پارامترهای مقاومت انتقال بار (Rct) حاصل از آزمون امپدانس الکتروشیمیایی و مقاومت پلاریزاسیون (Rp) و دانسیته جریان (Icorr) حاصل از منحنی‌های پلاریزاسیون حاکی از رسوب فیلمی محافظ بر روی سطح در حضور بازدارنده آلی 2- مرکاپتو بنزایمیدازول می‌باشد .
 

کلیدواژه‌ها


عنوان مقاله [English]

Study of the Corrosion Behavior of Mild Steel in Sodium Chloride Solution with Zinc Phosphate Pigment Extract and Organic Inhibitor

نویسنده [English]

  • reza naderi mahmoodi 1
چکیده [English]

One of the approaches for improving the protective performance of organic coatings is to add organic corrosion inhibitors in the formulation. The scope of this research is to investigate the corrosion behavior of mild steel in 3.5% sodium chloride solution with zinc phosphate anticorrosion pigment (ZP) and 2-mercaptobenzimidazole as organic inhibitor through taking advantage of electrochemical impedance spectroscopy (EIS) and polarization measurements. The results which were obtained from electrochemical tests on the samples within 24 hours of immersion in the solution indicated superior protective performance of the combination of zinc phosphate anticorrosion pigment and 2-mercaptobenzimidazole inhibitor compared to only the zinc phosphate pigment. In general, time variations of parameters charge transfer resistance (Rct) which was obtained from electrochemical impedance spectroscopy and polarization resistance (Rp) as well as corrosion current density (icorr) which were extracted from polarization curves implied precipitation of a protective layer on the surface in the presence of 2-mercaptobenzimidazole inhibitor.
 

کلیدواژه‌ها [English]

  • Corrosion
  • Zinc Phosphate
  • 2-mercaptobenzimidazole Inhibitor
  • Electrochemical Impedance Spectroscopy
  • Polarization Curve

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