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中国腐蚀与防护学报  2017, Vol. 37 Issue (5): 473-478    DOI: 10.11902/1005.4537.2017.070
  研究报告 本期目录 | 过刊浏览 |
L921A钢在3.5%NaCl溶液中的有机/无机复配缓蚀剂研究
陈振宁,陈日辉,潘金杰,滕艳娜,雍兴跃()
北京化工大学 有机无机复合材料国家重点实验室 北京 100029
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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摘要: 

针对L921A合金钢在3.5%(质量分数)NaCl溶液中的腐蚀较为严重,研制了一种基于有机/无机复配的无毒、高效的缓蚀剂。结果表明：该缓蚀剂是一种阳极型缓蚀剂,其缓蚀效率达到97%以上。L921A合金钢在3.5%NaCl溶液中,其阻抗谱由一个高频容抗弧和低频感抗弧组成,具有两个时间常数,表明L921A合金钢在3.5%NaCl溶液中具有点蚀敏感性。当在3.5%NaCl溶液中添加缓蚀剂后,L921A合金钢的阻抗谱仅为单个容抗弧,只有一个时间常数。浸泡35 h后,其阻抗值由103 Ωcm2增加到1.1×104 Ωcm2。此时,缓蚀剂在合金钢表面形成一层膜,其覆盖度达到约80%。
关键词 ： L921A钢,  NaCl溶液,  正交试验,  缓蚀剂,  电化学阻抗谱,  缓蚀机理    
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
收稿日期: 2017-05-02     
作者简介: 陈振宁,女,1993年生,硕士生
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陈振宁
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引用本文:

陈振宁,陈日辉,潘金杰,滕艳娜,雍兴跃. L921A钢在3.5%NaCl溶液中的有机/无机复配缓蚀剂研究[J]. 中国腐蚀与防护学报, 2017, 37(5): 473-478.
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.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.070      或      https://www.jcscp.org/CN/Y2017/V37/I5/473

图1  合金钢在3.5%NaCl溶液中浸泡35 h前后的表面形貌
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
表1  五因素四水平正交试验
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 ---
表2  正交试验结果分析
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 --- ---
表3  正交试验方差分析
图2  L921A合金钢在添加与未添加缓蚀剂的3.5%NaCl溶液中的腐蚀电位随浸泡时间的变化
图3  L921A合金钢在添加与未添加缓蚀剂的3.5%NaCl溶液中浸泡35 h后的极化曲线
图4  L921A合金钢在添加与未添加缓蚀剂的3.5%NaCl溶液中浸泡35 h后的Nyquist图,阻抗模值图和相角图
图5  基于EIS的等效电路图
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
表4  基于EIS的等效电路参数
图6  缓蚀剂膜的覆盖度随浸泡时间的变化
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