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Journal of Chinese Society for Corrosion and protection  2017, Vol. 37 Issue (5): 473-478    DOI: 10.11902/1005.4537.2017.070
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Organic/inorganic Compound Corrosion Inhibitor of L921A Steel in NaCl Solution
Zhenning CHEN,Rihui CHEN,Jinjie PAN,Yanna TENG,Xingyue YONG()
State Key Laboratory of Organic Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
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Abstract  

A non-toxic and compound organic-inorganic corrosion inhibitor was prepared with cerium salt, polyphosphate, Zn-salt, borate and organic polymer as raw materials, and then the effect of which on the corrosion of alloy steel L921A in 3.5%(mass fraction) NaCl solution was studied by weight loss measurement in conjunction with orthogonal method. The results show that the corrosion inhibitor was an anodic corrosion inhibitor with inhibition efficiency 97% for alloy steel L921A. The electrochemical impedance spectroscopy (EIS) spectrum of the alloy steel L921A in 3.5%NaCl solution was composed of a high frequency capacitive loop and a low frequency inductive loop with two time-constants, indicating that the alloy steel L921A presented pitting susceptibility in 3.5%NaCl solution. When the corrosion inhibitor was added to the 3.5%NaCl solution, the EIS spectrum of the alloy steel L921A presented only a single capacitive loop with one time-constant. After immersion in 3.5%NaCl solution for 35 h, the electrochemical impedance of the steel increased from 103 Ωcm2 to 1.1×104 Ωcm2. In this case, the coverage of the corrosion inhibitor reached about 80% of the surface of the alloy steel L921A.
Key words:  L921A steel      NaCl solution      orthogonal test      corrosion inhibitor      electrochemical impedance spectroscopy      corrosion mechanism     
Received:  02 May 2017     
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Zhenning CHEN
Rihui CHEN
Jinjie PAN
Yanna TENG
Xingyue YONG

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Zhenning CHEN,Rihui CHEN,Jinjie PAN,Yanna TENG,Xingyue YONG. Organic/inorganic Compound Corrosion Inhibitor of L921A Steel in NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2017, 37(5): 473-478.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.070     OR     https://www.jcscp.org/EN/Y2017/V37/I5/473

Fig.1  SEM images of L921A steel after corrosion for 35 h in 3.5%NaCl solution without inhibitor (a), with inhibitor (b), and before corrosion (c)
Level A B C D E
1 10 100 50 100 100
2 30 300 100 200 200
3 50 500 150 300 300
4 70 700 200 400 400
Table 1  Orthogonal test with 5 factors and 4 levels (mgL-1)
No. A B C D E Inhibition efficiency / %
1 A1 B1 C1 D1 E1 78.5
2 A1 B2 C2 D2 E2 89.5
3 A1 B3 C3 D3 E3 91.9
4 A1 B4 C4 D4 E4 88.5
5 A2 B1 C2 D3 E4 95.9
6 A2 B2 C1 D4 E3 92.7
7 A2 B3 C4 D1 E2 98.9
8 A2 B4 C3 D2 E1 95.0
9 A3 B1 C3 D4 E2 98.4
10 A3 B2 C4 D3 E1 95.1
11 A3 B3 C1 D2 E4 92.0
12 A3 B4 C2 D1 E3 99.1
13 A4 B1 C4 D2 E3 94.8
14 A4 B2 C3 D1 E4 91.1
15 A4 B3 C2 D4 E1 97.1
16 A4 B4 C1 D3 E2 93.5
I/4(%) 87.1 91.9 89.2 91.9 91.4 ---
II/4(%) 95.6 92.1 95.4 92.8 95.1 ---
III/4(%) 96.1 95.0 94.1 94.1 94.6 ---
IV/4(%) 94.1 94.0 94.3 94.2 91.9 ---
R(%) 9.0 3.1 6.2 2.3 3.7 ---
Table 2  Analysis of orthogonal test results
Factor Sum of square of deviation Degree of freedom F FCritical
A 209.070 3 2.722 5.420
B 26.651 3 0.347 5.420
C 91.789 3 1.195 5.420
D 14.957 3 0.195 5.420
E 41.616 3 0.542 5.420
Error 384.080 15 --- ---
Table 3  Variance analysis of orthogonal test
Fig.2  Variations of corrosion potential of L921A steel with time during immersion in 3.5%NaCl solution with and without inhibitor
Fig.3  Polarization curves of L921A steel after immersion for 35 h in 3.5%NaCl solution with and without inhibitor
Fig.4  Nyquist (a), impendance module (b) and phase angle (c) plots of L921A steel after immersion for 35 h in 3.5%NaCl solution with and without inhibitor
Fig.5  Equivalent circuits of EIS for L921A steel during immersion in 3.5%NaCl solution without (a) and with (b) inhibitor
Condition Rs / Ωcm2 Rt / Ωcm2 L / Hcm2 R0 / Ωcm2 CPE-Y0 / Ssa α
Without inhibitor 6.119 1.60×103 5.63×10-4 2.44×104 4.79×10-4 7.47×10-1
With inhibitor 7.217 2.08×104 --- --- 1.66×10-4 7.26×10-1
Table 4  Equivalent circuit parameters obtained by fitting EIS in Fig.4
Fig.6  Coverage of corrosion inhibitor film as a function of immersion time
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