The Corrosion Control Technologies Biology Essay

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Corrosion control technologies including coating, anode passivation, cathodic protection and corrosion inhibitors such as adding or use. Among them, the use of corrosion inhibitors is an effective, simple means of preservation, is to improve the corrosion resistance of steel an effective way. Many studies indicate that there are models with good corrosion inhibition effect and economic benefits, which heterocyclic atoms or molecules can be adsorbed unsaturated bonds in the metal surface, to inhibit metal corrosion purposes. However, with the widespread use of corrosion inhibitors, environmental pollution, the question then arises, in line with the principles of environmental protection, development and research efficient, cheap and environment-friendly corrosion inhibitor research has become a new topic

This paper mainly through weight loss, electrochemical measurements, surface morphology analysis, quantum chemistry calculation methods examined five substances for 3% Na2S solution, 60 # steel corrosion effects. These include inorganic compounds - sodium molybdate and four organic compounds (fluconazole, tinidazole, sulfamethoxazole, norfloxacin), the selected organic compounds have better stability, antibacterial, non-toxic, and contain unsaturated bonds, or sulfonyl, and amino functional groups. In this paper the inhibition mechanism of five compounds were analyzed, compared to their inhibition effect. Thesis research are as follows:

(1) 298K, the four kinds of organic inhibitor in 3% Na2S solution for 60 steel all have a certain degree of corrosion inhibition, the inhibition mechanism of organic molecules adsorbed on the 60 # steel protective film formed on the surface, inhibiting the electrochemical cathodic and anodic process, reduce the corrosion current density, thus inhibiting metal corrosion rate. Four kinds of organic inhibitor in the 60 # steel to obey Langmuir adsorption isotherm, adsorption Gibbs free energy , indicated that the adsorption processes are spontaneous, from can determine four kinds of values organic molecules in the 60 # steel surface adsorption are physical adsorption and chemical adsorption result of the role.

(2) potential scanning results show that, with added corrosion inhibitors, corrosion current density decreased; electrochemical impedance measurements show that with increasing the concentration of charge-transfer resistance Rt value increases, the corrosion inhibitor adsorption layer of 60 # steel surface of the protective effects. Electrochemical experiments measured inhibition efficiency and concentration trends in the results obtained with the experimental weight loss is consistent.

(3) four kinds of organic inhibitor in 3% Na2S solution for 60 # steel corrosion inhibition phenomena exist in extreme concentrations, fluconazole in 650mg / L, tinidazole in the 400mg / L, sulfamethoxazole In the 700mg / L, norfloxacin at 400mg / L is about the highest inhibition efficiency values ​​obtained considering the performance of four kinds of organic order of Corrosion Inhibitors: norfloxacin> fluconazole> tinidazole> sulfamethoxazole.

(4) inferred four quantum chemical calculations of organic inhibitor molecules active adsorption centers, the adsorption of different molecules containing reactive functional groups are different, resulting in different strength of adsorption capacity.

(5) The experimental results show that the choice of the four organic corrosion inhibitor than inorganic inhibitor sodium molybdate in 3% Na2S solution for 60 # steel corrosion inhibition is weak, the surface of the metal substrate [Fe-MoO4-Fe2O3] oxide protective film of less dense, easy to fall off, as the anodic corrosion inhibitor, less the amount it will accelerate the corrosion rate of the metal substrate; while for the adsorption of organic corrosion inhibitor type, by physical adsorption and chemical adsorption together, spontaneously formed in the substrate surface protective film, the relative stability of the strong. Experimental set conditions, with corrosion inhibitor performance is better than no model type inhibitor.

Table of Contents

Chinese Abstract I

English Summary III

1 thread on

1.1 INTRODUCTION 1

1.2 Overview of a corrosion inhibitor

1.3 The future direction of the inhibitor 4

1.4 Corrosion properties of Method 4

1.4.1 4 weight-loss method

1.4.2 Potential sweep polarization curves 5

1.4.3 Electrochemical Impedance Spectroscopy 5

1.4.4 Ellipsometry spectroscopy 5

1.4.5 Quantum chemical calculations 6

1.5 Mechanism of corrosion inhibition 7

1.6 Inhibitor Research 8

1.7 Research topics of meaning and content of 9

1.7.1 topics of significance 9

1.7.2 The study 9

2 Experimental materials, equipment and research process parameters 11

2.1 experimental materials and selection

2.1.1 Experimental Materials 11

2.1.2 based on selected

2.2 Experimental Equipment 14

2.3 Research Methods 15

2.3.1 Experiment 15 weight loss

2.3.2 Electrochemical Test Methods 15

2.3.3 Quantum chemical calculations 16

2.3.4 Scanning electron microscopy (SEM) 16

3 Results and discussion 17

3.1 Performance of the results of the inhibition of fluconazole 17

3.1.1 Test weight-loss method

3.1.2 Potential scanning test 18

3.1.3 AC impedance test

3.1.4 fluconazole in 60 # steel surface adsorption behavior of 21

3.1.5 The quantum chemical calculations 22

3.2 The corrosion inhibition study of tinidazole 23

3.2.1 Test weight-loss method

3.2.2 Potential scanning test 24

3.2.3 AC impedance test 25

3.2.4 tinidazole in the 45 # steel surface adsorption behavior of 27

3.2.5 The quantum chemical calculations 28

3.3 sulfa me thoxazole results of the corrosion properties of 29

3.3.1 Test 29 weight-loss method

3.3.2 Potential sweep polarization curves 29

3.3.3 AC impedance test 30

3.3.4 sulfamethoxazole 45 # steel surface in the adsorption behavior of 32

3.3.5 Quantum chemical calculations

3.4 Corrosion properties of norfloxacin 34 results

3.4.1 Loss of data 34

3.4.2 Potential scanning test 35

3.4.3 AC impedance test 36

3.4.4 In the 45 # steel norfloxacin adsorption behavior of 38

3.4.5 The quantum chemical calculations 39

3.5 Corrosion properties of sodium molybdate 40

3.5.1 Potential scanning test 40

3.5.2 AC impedance test 41

3.5.3 Inhibition Mechanism of sodium molybdate 42

3.6 Summary 43

4 Performance comparison of five kinds of Corrosion Inhibitors and discussion 45

4.1 Comparing the efficiency of five kinds of Corrosion Inhibitors 45

4.2 Quantum chemical calculations 46

4.3 Adsorption of organic corrosion inhibitors compared 49

4.4 corrosion morphology analysis and comparison of 50

4.5 Summary 52

5 Conclusion and Outlook 55

5.1 Conclusion 55

5.2 recommendations for future work and prospects 56

Acknowledgements 57

References 59

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