Abstract:

A new corrosion inhibitor and Universal antibacterial reagent, namely, the copolymer of N-isopro-pylacrylamide(NIPAM) and N-allyl-1-benzoyl-3-phenyl-4,5-dihydro-4-formamido pyrazole(BPCP) was prepared. Its inhibitory effect on the corrosion of N80 steel panel in 1 molar hydrochloric acid solution was investigated at room temperature via the static mass-loss method, and the adsorption of the copolymer molecules on the surface of N80 steel panel was studied through electrochemical impedance spectroscopy(EIS). Minimal inhibitory concentration(MIC) of the copolymer for different kinds of bacterials was determine with the liquor dilution approach which has been accepted prevalently. Results obtained from the experiments indicate the copolymer is an efficient chemical erosion inhibitor that hinders the corrosion of N80 steel panel in 1 mol/L HCl solution. The inhibition efficiency of the copolymer increases with the increase in inhibitor concentration within a mass content range from 0.5 g/L to 7.0 g/L, reaching optimal value up to 90.3％ at a inhibitor concentration of 6 g/L, only half of the amount of the reported inhibitor in the literature, 1/10 of the amount of small molecule inhibitor NABPPAA. Adsorption of copolymer on N80 steel panel′s surface follows Langmuir′s isotherm within experimental mass concentration range. Calculated adsorption enthalpy of the copolymer on N80 steel panel surface is 30.446 kJ/mol. Its adsorption model can be mainly ascribed to the chemical nature of adsorption(chemisorptions) according to the adsorption enthalpy. Large and persistant inhibitory effect of the copolymer on N80 steel erosion in acid solution is observed within a temperature range of 25～80 ℃. The results reveal that the copolymer has a broad inhibitory and has a good germicidal effect on several kinds of bacteria.