Koroziono ponašanje nerđajućeg čelika EN 1.4301 u kiseloj sredini u prisustvu PBTCA inhibitora

Borislav Malinović,Duško Zorić,Tijana Đuričić

doi:10.5937/zasmat2002133m

Abstract

In this study, corrosion behaviour of stainless steel in 0.5 M and 1 M hydrochloric acid was examined. Also, commercial corrosion inhibitor which contain 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) is examined as potential inhibitor for stainless steel EN 1.4301 in 0.5 M hydrochloric acid. For experimental research it was used DC-technique (Tafel extrapolation, linear polarization method and potentiodynamic polarization). The obtained results show that the inhibitor is effective in mentioned acid environment and the protection efficiency depends primarily on the concentration of the inhibitor. Based on the obtained results this inhibitor has moderate inhibition efficiency, since the highest efficacy was achieved Ei = 55.7%. According to the corrosion mechanism the inhibitor is behaved as a mixed inhibitor.

Highlights

In modern industry corrosion is a serious problem as from the technical, from ecological and economical aspects
Based on the results obtained by electrochemical methods of testing the corrosion process on EN 1.4301 stainless steel, as well as testing the effectiveness of a commercial corrosion inhibitor (HEMOD MS 1E), it can be concluded that stainless steel shows higher stability in 0.5M HCl compared to 1M HCl
Tested inhibitor is effective in protecting stainless steel in 0.5M HCl, and the degree of protection depends on the inhibitor concentration

Summary

Introduction

In modern industry corrosion is a serious problem as from the technical, from ecological and economical aspects. There are several methods of corrosion protection. These methods can be classified as changing electrode potential of the metal surface or changing the nature of the metal. Cathodic and anodic protection are two methods of controlling corrosion by changing the electrode potential. Material selection is not possible due to the requirement to maintain another desirable characteristic, or is economically unprofitable. In such cases, the use of corrosion inhibitors becomes a possible way of controlling corrosion [1]

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