摘要
将一种含有长度在20~80个碱基的各种引物的混合溶液溶解在核酸缓冲液中作为核酸阻锈剂,通过线性极化和电化学阻抗谱(EIS)两种电化学手段分别研究共存阴离子HCO-3和SO 2-4对核酸阻锈剂在模拟混凝土孔溶液中对钢筋氯盐腐蚀的影响。利用X射线光电子能谱(XPS)分析了在有共存阴离子存在的模拟混凝土孔溶液中钢筋电极在核酸阻锈剂作用下表面膜的组成结构。结果表明:核酸阻锈剂具有良好的钢筋防腐蚀效果,共存阴离子HCO-3的存在使钢筋的腐蚀速率加快,但核酸的加入能明显减弱钢筋腐蚀倾向,具有和商用阻锈剂(主要成分为磷酸钠)基本相同的阻锈效率;共存阴离子SO 2-4的存在加快了钢筋的腐蚀速率,且SO 2-4的浓度较低时核酸阻锈剂的阻锈效率已经超过了同等条件下的商用阻锈剂。
A deoxyribonucleic acid(DNA)corrosion inhibitor was prepared by dissolving a mixture of primers with a length of 20~80 bases in a nucleic acid buffer.Linear polarization and electrochemical impedance spectroscopy(EIS)were employed to investigate the effect of coexisting anions,HCO-3 and SO 2-4,on the chloride-induced corrosion of reinforced steel in simulated concrete pore solution for the corrosion inhibition of DNA.After different treatments,X-ray photoelectron spectroscopy(XPS)was used to characterize the structure of the surface membrane of the reinforced steel.The results show that the DNA corrosion inhibitor has a good anticorrosive effect on the steel reinforcement.However,the presence of coexisting anion HCO-3 accelerates the corrosion rate of the reinforced steel.The addition of the DNA corrosion inhibitor alleviates the steel corrosion process and its rust inhibition efficiency is comparable to that of the commonly used commercial corrosion inhibitor(the main component is sodium phosphate).The presence of SO 2-4 increases the corrosion rate of the reinforced steel,and its corrosion inhibiting efficiency is even higher than that of the commercial one under the same conditions.
作者
蒋林华
陈晨
郭明志
储洪强
徐鹏
JIANG Linhua;CHEN Chen;GUO Mingzhi;CHU Hongqiang;XU Peng(College of Mechanics and Materials,Hohai University,Nanjing 210098,China)
出处
《水利水电科技进展》
CSCD
北大核心
2020年第1期88-94,共7页
Advances in Science and Technology of Water Resources
基金
国家重点研发计划(2018YFC1508704)
国家自然科学基金(51278167)
关键词
共存阴离子
核酸
阻锈剂
模拟混凝土孔溶液
腐蚀
电化学方法
coexisting anions
DNA
corrosion inhibitor
simulated concrete pore solution
corrosion
electrochemical method
