有机氨基醇阻锈剂在混凝土模拟孔隙液和砂浆试块中对钢筋的阻锈作用

Composite Organic Compound as Corrosion Inhibitor for Reinforced Steel in Simulated Concrete Pore Solution or Mortar Specimen

制备了有机氨基醇阻锈剂(ZX),通过干湿循环实验、线性极化(LPR)和电化学阻抗谱(EIS)测试、扫描电镜(SEM)分析,研究了ZX以及N,N-二甲基乙醇胺(DMEA)在混凝土模拟孔隙液以及砂浆试块中对钢筋的阻锈作用。结果表明,在混凝土模拟孔隙液中加入ZX以及DMEA均有良好的阻锈效果;干湿循环实验中,当掺量为0.75%时,ZX与DMEA的阻锈效率分别为98.63%以及78.05%。在电化学实验中,随着阻锈剂掺量的增加,阻锈剂对钢筋腐蚀的抑制作用越明显;且在相同浓度下,ZX的阻锈效果优于DMEA的。此外,砂浆试块结果表明,初始时阻锈剂均可有效抑制钢筋的腐蚀,但是随着循环次数的增加,DMEA抑制腐蚀的效果减弱较为明显,而ZX可有效延缓钢筋的起始锈蚀时间,且在砂浆试块中ZX抑制钢筋腐蚀的效果优于DMEA。

Composite organic amino-alcohol compound(ZX)and N,N-dimethylethanolamine(DMEA)are prepared as corrosion inhibitors for reinforced steel in simulated conceret pore solution or mortar specimens.Then their corrosion inhibition performance was assessed by means of dry and wet cycle experiments,liner polarization resistance(LPR)measurements,electrochemical impedance spectroscopy(EIS)and scanning electron microscopy(SEM).The results indicate that inhibitors ZX and DMEA present good inhibition efficiency for steel bar in the simulated pore solutions of concrete.The corrosion inhibition efficiency by the pore solution with the dosage of 0.75%ZX and DMEA is 98.63%and 78.05%respectively in the dry-wet cycle experiments.The electrochemical experiments show that the corrosion inhibition effect of inhibitor on steel is more obvious with the increasing inhibitor dosage,whilst the inhibition effect of ZX is better than DMEA by the same dosage.Furthermore,the mortar experiments reveal that with the increase of the number of cycles,the weakening of corrosion inhibition effect of DMEA is obvious,whilst the organic amino-alcohol inhibitor can effectively delay the time for corrosion initiation of the steel bar,thus ZX is better than DMEA in corrosion inhibition within mortar specimens.