Research on Corrosion Characteristics and Protective Measures of Water Supply Pipes
The corrosion inhibition properties of sulfadiazine dipyrimidine and pimelthiamine(SP)on water supply pipes were studied and evaluated under anaerobic conditions and compared with the corrosion inhibition properties of industrial corrosion inhibitors(SI).Modified gravimetric and electrochemical techniques were employed.The experimental results showed that the corrosion inhibition efficiencies of SP and SI were comparable,with a maximum inhibition efficiency of 78.85%for SP and 75.44%for SI at an inhibitor concentration of 0.01 mol·L-1.The corrosion inhibition efficiencies of SP were slightly higher,whereas SI provided a more stable protection against corrosion.The corrosion inhibition efficiency increased as the concentration of both substances increased,the corrosion rate constant K decreased with increasing of SP and SI concentrations,while the material half-life increased with increasing of SP and SI concentrations.The polarization curves showed that both SP and SI exhibited mixed corrosion inhibition behavior.The chemisorption mechanism of SP and SI adsorption on the surface of pipeline steel was explained,and Langmuir adsorption isotherm was used to fit the adsorption characteristics of the corrosion inhibitors.
Water supply pipeCorrosion protectionCorrosion inhibitorElectrochemical
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