林产化学与工业2017，Vol.37Issue(1)：101-108,8.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
Corrosion Inhibition of Steel in Glycolic Acid Solution byCassava Starch Grafted Copolymer
摘要
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 (ΔHΘ) of-23.8 kJ/mol, the adsorption free energy (ΔGΘ) was-28.3 kJ/mol to-28.9 kJ/mol and the adsorption entropy (ΔSΘ) 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.关键词
木薯淀粉/接枝共聚物/缓蚀剂/钢/羟基乙酸Key words
cassava starch/graft copolymer/inhibitor/steel/glycolic acid分类
化学化工引用本文复制引用
李向红,邓书端,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):101-108,8.基金项目
国家自然科学基金资助项目(51561027) （51561027）
云南省中青年学术和技术带头人后备人才项目(2015HB049) （2015HB049）
云南省教育厅科学研究基金重点项目(2013Z080) （2013Z080）
