在室温添加丙烯基硫脲(ATU)的稀盐酸溶液中,对块体纳米晶工业纯铁(BNII)和普通工业纯铁(CPII)的电化学腐蚀行为进行了对比研究.结果表明:在空白室温1mol.L~(-1) HCl中,BNII的抗腐蚀能力比CPII的强.当添加ATU,浸泡5min后,两种样品的EIS(电化学阻抗谱)均没有出现感抗弧.随着时间的延长,对于BNII,EIS谱图上出现-Warburg阻抗.在浓度为100mg.L~(-1),进行动电位极化测试时,两种样品均出现阳极脱附现象,脱附电位E_(des)有明显差异.与CPII相比,ATU对BNII的缓蚀作用非常有限,甚至有促进其腐蚀的趋势.
The inhibitive effect of allyl-thiourea(ATU)on the corrosion behaviors of bulk nanocrystalline and conventional polycrystalline ingot iron(BNII & CPII)in dilute HCl solution was tested.Results indicate that BNII is less prone to get corrosive than its coarse grain counterpart in blank 1mol·L HCl at room temperature.When CPII and BNII are immersed for 5 min in the corrosive solution inhibited by ATU,no inductive loop appears at different concentrations.When the time is prolonged,for BNII,a Warburg impedance appears.When the electrodes of the two samples are polarized anodically during the potentiodynamic polarization tests,the phenomenon of desorption lappears at the concentration of 100mg/L,but the variation of the potential E_(des) between is obvious.The inhibition effect of ATU for BNII is limited by comparison with CPII.
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