Abstract
Many research studies have been conducted on the corrosion inhibition performance of imidazole in acidic environments such as in the piping of a petrochemical plant. However, there has been no study on the effect of imidazole in alkaline conditions such as a local district water heating environment. Therefore, in this study, the effect of imidazole as a corrosion inhibitor on carbon steel weldment was investigated in alkaline district heating water. Inhibition efficiency and electrochemical properties were investigated by potentiodynamic polarization test and electrochemical impedance spectroscopy. As the concentration of imidazole increased up to 500 ppm, inhibition efficiency increased up to 91.7%. At 1000 ppm, inhibition efficiency decreased. Atomic force microscopy showed that surface coverage of imidazole at 1000 ppm is lower than that of imidazole at 500 ppm. X-ray photoelectron spectroscopy showed that with 500 ppm of imidazole, the amount of pyrrole type interaction is 4.8 times larger than pyridine type interaction. At 1000 ppm of imidazole, the amount of pyridine type interaction is 3.49 times larger than pyrrole type interaction. Depending on the concentration of imidazole, the ratio of interaction between carbon steel and imidazole affected inhibition efficiency.
Highlights
Corrosion of metal in aqueous systems has led to structural degradation and accidents
Many studies have been conducted on the corrosion inhibition performance of imidazole in acidic environments such as in the piping of a petrochemicals plant [21,22]
There is no study on the effect of imidazole in alkaline conditions such as the local district heating environment. no stuIndythoins tshtue defyf,ecwt eo,f tihmeirdeafozroele, ainnaallykzaelidnethceonedffieticotnosfsuimchidaasztohlee looncatlhdeiswtreicltdhmeeantitnogf ecnavrbiroonnmsteeenlt.in deaerated district heating water with electrochemical analysis techniques suchInasthpiostesntutidoyd,ywnaem, tihcepreofloareiz,aatnioanlytzeesdt atnhde elfefecctrtoocfheimmiidcalzoimlepoendatnhceewspeeldctmroesnctoopfy ctaorobbotnaisnteceolrirnosdieoaneratedanddisitnrihcitbhiteioatninegffiwciaetnecryw
Summary
Corrosion of metal in aqueous systems has led to structural degradation and accidents. Weldments of carbon steel are especially susceptible due to properties such as having different microstructures of base metal [6]. To reduce this problem, low-cost water treatment methods have been applied including pH control, deaeration, and addition of inhibitors [7,8,9]. The organic inhibitor is one of the major methods used to reduce corrosion rate by its adsorbing on metal surfaces [10]. Many studies have been conducted on the corrosion inhibition performance of imidazole in acidic environments such as in the piping of a petrochemicals plant [21,22]. We achieved the optimum concentration of imidazole and analyzed the mechanism o2f. iMnhaitbeirtiiaolns.and Methods
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