Study On The Factors Affecting The Adsorption Performance Of Mannich Base Corrosion Inhibitor

As a high-temperature acidizing corrosion inhibitor,mannich base is widely used petrochemical industry.However,with the increase of production demand,and the temperature is getting higher and higher,the corrosion inhibition effect cannot meet the production demand of the industry.The inhibition efficiency of mannich base is affected by many factors.Among all the factors,group type and temperature are the main factors.Four kinds of mannich base derivatives with different groups were designed and synthesized.The corrosion weight loss experiment,polarization curve test and impedance spectrogram test were carried out to study the corrosion inhibition mechanism.The boundary orbital energy level and adsorption simulation were calculated.The relationship between corrosion inhibition and adsorption performance of mannich base was discussed.The relationship between the frontier orbital energy level and the simulated adsorption energy size with the corrosion inhibition performance of Mannich base and molecular adsorption performance are analyzed through analyzing the results of experiments and calculation.In order to study the effect of group type and temperature on the adsorption performance of Mannich base,Mannich base was used as the main molecular body,and different types of groups were dated to the position of the side chain of Mannich base.Eight molecular structures were designed.The energy level of front orbits were calculated.The molecular adsorption simulation at different temperatures were calculated.The frontier orbital energy level difference of each molecule and adsorption simulation calculation of adsorption energy at different temperatures are obtained.By comparing the difference in energy level and the numerical of the adsorption energy,the effect of the group type on the adsorption performance of Mannich base molecules was studied.By comparing the numerical of the adsorption energy at different temperatures,the effect of temperature on the adsorption performance of the corrosion inhibitor is analyzed,and a relatively better molecular structure of Mannich base is finally obtained.