木薯淀粉接枝共聚物对钢在羟基乙酸溶液中的缓蚀性能

doi:10.3969/j.issn.0253-2417.2017.01.013

林产化学与工业 ›› 2017, Vol. 37 ›› Issue (1): 101-108.doi: 10.3969/j.issn.0253-2417.2017.01.013

木薯淀粉接枝共聚物对钢在羟基乙酸溶液中的缓蚀性能

李向红¹, 邓书瑞², 李云仙¹, 刘建祥¹

1. 西南林业大学理学院, 云南昆明 650224;
2. 西南林业大学材料工程学院, 云南昆明 650224

收稿日期:2016-03-02 出版日期:2017-02-25 发布日期:2017-02-25
作者简介:李向红(1981-),男,云南大理人,副教授,博士,主要从事缓蚀剂的研究;E-mail:xianghong-li@163.com
基金资助:
国家自然科学基金资助项目（51561027）；云南省中青年学术和技术带头人后备人才项目（2015HB049）；云南省教育厅科学研究基金重点项目（2013Z080）

Corrosion Inhibition of Steel in Glycolic Acid Solution by Cassava Starch Grafted Copolymer

LI Xianghong¹, DENG Shuduan², LI Yunxian¹, LIU Jianxiang¹

1. Faculty of Science, Southwest Forestry University, Kunming 650224, China;
2. Faculty of Materials Engineering, Southwest Forestry University, Kunming 650224, China

Received:2016-03-02 Online:2017-02-25 Published:2017-02-25

摘要/Abstract

摘要： 用丙烯酰胺（AA）单体对木薯淀粉（CS）进行接枝共聚化学改性，合成了木薯淀粉接枝共聚物（CSGC），采用失重法和电化学法研究了CSGC对冷轧钢在羟基乙酸溶液中的缓蚀性能。结果表明：CSGC能有效抑制冷轧钢在羟基乙酸中的腐蚀；缓蚀率随CSGC添加量的增大而不断上升，缓蚀率会随着温度的上升和浸泡时间的延长而下降，缓蚀率随着羟基乙酸质量浓度的增加呈先上升后下降的趋势。20℃时100 mg/L CSGC在0.3 mol/L羟基乙酸中浸泡24 h缓蚀率（失重法）高达92.1%，浸泡时间延长至72 h缓蚀率可达到89.13%。20~50℃时CSGC在0.3 mol/L羟基乙酸中的钢表面吸附符合Langmuir等温式，吸附焓（ΔH^⊖）为-23.8 kJ/mol、吸附Gibbs自由能（ΔG^⊖）为-28.3~-28.9 kJ/mol、吸附熵（ΔS^⊖）为15.4~16.8 J/（mol·K）。羟基乙酸中CSGC在钢表面发生物理吸附/化学吸附的混合吸附，且吸附伴随熵增加的放热过程。在0.3 mol/L羟基乙酸中CSGC为符合“几何覆盖效应”机理的混合抑制型缓蚀剂；由Nyquist图谱显示，钢/羟基乙酸界面上存在H₂O、H⁺、HOCH₂COO^-和CSGC的吸附/脱附过程，CSGC通过挤走水分子发生吸附。

关键词: 木薯淀粉, 接枝共聚物, 缓蚀剂, 钢, 羟基乙酸

Abstract: Cassava starch grafted copolymer (CSGC) was synthesized via the chemical modification of cassava starch (CS) by grafting the monomer of acryl amide. The inhibition effect of CSGC on the corrosion of cold rolled steel (CRS) in glycolic acid was studied by weight loss method and electrochemical techniques. The results showed that CSGC could effectively retard the corrosion of cold rolled steel in glycolic acid solution. Inhibition efficiency was increased with the rise of dosage of CSGC. Meanwhile, it was decreased with the increasing of temperature and prolonging immersion time. The inhibition concentration, the maxima inhibition efficiency is found at 0.3 mol/L HOCH₂COOH. The efficiency rose firstly. The inhibition efficiency was 92.1% as the steel were treated by 100 mg/L CSGC at 20℃ in 0.3 mol/L glycolic acid and it could also reach 89.1% even when the immersion time is prolonged to 72 h. The adsorption of CSGC on CRS surface in 0.3 mol/L glycolic acid at 20-50℃ obeyed the Langmuir isotherm with the adsorption enthalpy (ΔH^⊖) of -23.8 kJ/mol, the adsorption free energy (ΔG^⊖) was -28.3 kJ/mol to -28.9 kJ/mol and the adsorption entropy (ΔS^⊖) was about 15.4-16.8 J/(mol·K). The adsorption of CSGC on steel surface in glycolic acid was the mixed adsorption of physical and chemical adsorption. Also, it was an exothermic process accompanied with the increase of entropy. CSGC was considered as a mixed-type inhibitor via geometric blocking effect. Nyquist spectra exhibited one large capacitive loop followed by a small inductive loop at low frequencies. The charge transfer resistance significantly increased with the addition of CSGC, while interfacial double layer capacitance decreased.

Key words: cassava starch, graft copolymer, inhibitor, steel, glycolic acid

中图分类号:

TQ351

李向红, 邓书瑞, 李云仙, 刘建祥. 木薯淀粉接枝共聚物对钢在羟基乙酸溶液中的缓蚀性能[J]. 林产化学与工业, 2017, 37(1): 101-108.

LI Xianghong, DENG Shuduan, LI Yunxian, LIU Jianxiang. Corrosion Inhibition of Steel in Glycolic Acid Solution by Cassava Starch Grafted Copolymer[J]. Chemistry and Industry of Forest Products, 2017, 37(1): 101-108.

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木薯淀粉接枝共聚物对钢在羟基乙酸溶液中的缓蚀性能

Corrosion Inhibition of Steel in Glycolic Acid Solution by Cassava Starch Grafted Copolymer

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