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DAPA, EA, TU and BI as Vapour Phase Corrosion Inhibitors for Mild Steel under Atmospheric Conditions

Author Affiliations

  • 1 Material Science Lab., Dept. of Chemistry, Ch. Devi Lal University, Sirsa, Haryana 125 055, INDIA

Res.J.chem.sci., Volume 2, Issue (2), Pages 10-17, February,18 (2012)


Four new vapour phase corrosion inhibitor (VPCI) i.e. 3,3-diaminodipropylamine (DAPA), ethylamine (EA), thiourea (TU), and benzimidazole (BI)were tested for mild steel in different atmospheric conditions at 500C by weight loss, Eschke test, salt spray method, SO2 test and metallurgical research microscopy technique. All investigated VPCIs exhibited very good corrosion inhibition efficiency for mild steel. DAPA showed the best corrosion inhibition efficiency. The result obtained from weight loss technique, Eschke test, salt spray method, SO2 test were supported by metallurgical research microscopy technique. Inhibition of corrosion in vapour phase by VPCI takes place because they alkaline the medium to pH value at which the rate of corrosion becomes significantly low.


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