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Journal of Chinese Society for Corrosion and protection  2016, Vol. 36 Issue (6): 637-644    DOI: 10.11902/1005.4537.2016.186
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Preparation and Inhibition Behavior of Molybdate Intercalated ZnAlCe-hydrotalcite
Jihui WANG(),Huajie YAN,Wenbin HU
School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China
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Abstract  

Molybdate intercalated ZnAlCe-hydrotalcite (ZnAlCe-MoO4 LDH) was synthesized by using solvothermal method, and the preparation parameters such as n(Al3+)/n(Ce3+) ratio, reaction temperature and crystallization temperature were optimized by single factor and orthogonal experiments. The surface morphology and structure of the prepared ZnAlCe-MoO4 LDH were characterized by SEM, XRD and FT-IR methods. The inhibition behavior of ZnAlCe-MoO4 LDH for Q235 steel in 3.5%(mass fraction) NaCl solution were investigated by EIS and XPS. Results show that the synthesized ZnAlCe-MoO4 LDH presents laminar microstructure with the thickness of 30 nm. The optimum preparation conditions are n(Al3+)/n(Ce3+) ratio of 6:1, reaction temperature of 60 ℃and crystallization temperature of 100 ℃. The inhibition effect of ZnAlCe-MoO4 LDH on the corrosion of Q235 steel in 3.5%NaCl solution may be ascribed to the reduction of chloride concentration in 3.5%NaCl solution owing to the anion exchange with molybdate, the formation of passive film with the composition of ferrous or iron molybdate and the deposition of film consisted of zinc and cerium hydroxides.
Key words:  layered double hydroxide      inhibitor      orthogonal experiment      carbon steel      seawater     
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Jihui WANG
Huajie YAN
Wenbin HU

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Jihui WANG,Huajie YAN,Wenbin HU. Preparation and Inhibition Behavior of Molybdate Intercalated ZnAlCe-hydrotalcite. Journal of Chinese Society for Corrosion and protection, 2016, 36(6): 637-644.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.186     OR     https://www.jcscp.org/EN/Y2016/V36/I6/637

Experiment No. Factor Inhibitionrate / %
n(Al3+)/n(Ce3+) ratio Reactiontemperature / ℃ Crystallization temperature / ℃
1 5:1 25 80 19.33
2 5:1 40 100 42.92
3 5:1 60 120 43.59
4 5:1 80 140 11.52
5 6:1 25 100 37.02
6 6:1 40 80 50.90
7 6:1 60 140 52.10
8 6:1 80 120 34.08
9 7:1 25 120 40.01
10 7:1 40 140 29.24
11 7:1 60 80 51.85
12 7:1 80 100 39.70
13 8:1 25 140 38.62
14 8:1 40 120 37.20
15 8:1 60 100 49.52
16 8:1 80 80 36.60
Table 1  Orthogonal table and inhibition rate of ZnAlCe-MoO4 LDH
Fig.1  Variations of inhibition rate of ZnAlCe-MoO4 LDH with n(Al3+)/n(Ce3+) ratio (a), reaction temperature (b) and crystallization temperature (c) under the conditions of single factor experiments
Factor n(Al3+)/n(Ce3+) ratio Reaction temperature / ℃ Crystallization temperature / ℃
K1 29.34 33.75 39.92
K2 43.32 40.07 42.29
K3 40.45 49.52 38.72
K4 40.49 30.48 32.87
R 13.98 19.04 9.42
Major factor BAC
Optimal level A2 B3 C2
Table 2  Range analysis of inhibition rate of ZnAlCe-MoO4 LDH (%)
Fig.2  Variations of inhibition rate of ZnAlCe-MoO4 LDH with n(Al3+)/n(Ce3+) ratio (a), reaction temperature (b) and crystallization temperature (c) under the conditions of orthogonal experiments
Fig.3  Surface morphology (a) and EDS analysis (b) of ZnAlCe-MoO4 LDH
Fig.4  XRD pattern of ZnAlCe-MoO4 LDH
Fig.5  FT-IR spectrum of ZnAlCe-MoO4 LDH
Fig.6  Surface morphologies of Q235 steel after corrosion in 3.5%NaCl (a) and 3.5%NaCl+2 g/L ZnAlCe-MoO4 LDH (b) solutions
Fig.7  Full XPS spectrum (a), O1s (b) and Fe2p (c) spectra of Q235 steel after corrosion in 3.5%NaCl solution
Fig.8  Full XPS spectrum (a), O1s (b), Fe2p (c), Mo3d (d), Zn2p (e) and Ce3d (f) spectra of Q235 steel aftercorrosion in 3.5%NaCl+2 g/L ZnAlCe-MoO4 LDH solution
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