Electrochemical Investigation of Synergestic Effect of Ethylene Glycol and Borax in Presence of Sodium Silicate Inhibitor on The Corrosion Behavior of Carbon Steel A۱۰۶ in Sodium Chloride Solution

In this work, the inhibition effect of borax and ethylene glycol (EG) on the corrosion behavior of carbon steel A۱۰۶ was investigated in the solution containing ۹۰۰ ppm sodium silicate and ۱۰۰ ppm sodium chloride at ۲۵ °C. For this purpose, the potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods were applied. The increase of EG concentration up to ۵۰% by volume results the decrease of passive current density (ip) from ۱۹.۶ to ۱۲.۱ µA.cm-۲ whilst its effect on the breakdown potential (Eb) was negligible. When borax concentration increases up to ۴۵۰ ppm, the ip decreases significantly from ۱۹.۶ to ۴.۶ µA.cm-۲, further addition of borax causes to markedly decrease of resistance against both uniform and pitting corrosion. Moreover, borax showed the best synergistic effect at ۴۵۰ ppm concentration in ۳۰% EG solution containing ۹۰۰ ppm sodium silicate and ۱۰۰ ppm sodium.

کلیدواژه ها:

Carbon steel ، Sodium silicate ، Ethylene glycol ، Borax ، Polarization ، EIS ، فولاد ساده کربنی ، سدیم سیلیکات ، اتیلن گلایکول ، بوراکس ، پلاریزاسیون ، امپدانس الکتروشیمیایی.