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Corrosion Inhibition of Carbon-Steel in Carbonate-Bicarbonate Solution

Isdiriayani Nurdin & M. Syahri

 


Abstract. Carbondioxide (CO2) absorption system, using K2CO3 as absorbent, is one of the absorption unit which is susceptible to corrosion attack, especially the parts contacting the KHCO3 rich solution. Carbon steel which used to be the construction material of CO2 absorption system, is susceptible to corrosion in K2CO3 + KHCO3 solution with a passivation tendency. The use of passivating inhibitor, especially KVO3, is one of the most popular corrosion prevention method. Experimental results show that 20 g/dm2 KVO3 is effective to inhibit corrosion of carbon steel in K2CO3 + KHCO3 solution at temperature up to 100C and high turbulence. This passivation is due to the formation of protective layer which consists of η-Fe2O3 and FeVO4. Another passivating inhibitor, Na-benzoate, is found to be similarly effective to KVO3 in the same testing conditions. The passive film, formed by the addition Na-benzoate, consists of η-Fe2O3 and Fe2(OH)2CO3.

Keywords: carbon steel; carbonate-bicarbonate; corrosion; inhibitor; sodium benzoate

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