羟基亚乙基二膦酸对20SiMn钢在含Cl~-混凝土模拟孔隙液中的缓蚀行为
Corrosion Inhibition Behavior of 1-Hydroxyethylidene-1, 1-Diphosphonic Acid on 20SiMn Steel in Simulated Concrete Pore Solution Containing Cl~-
查看参考文献36篇
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文摘
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采用电化学技术(动电位极化曲线、自腐蚀电位、EIS以及Mott-Schottky曲线)和表面分析方法(SEM、 XPS)研究了羟基亚乙基二膦酸(HEDP)对空冷20SiMn低合金钢在含Cl~-的高碱性混凝土模拟孔隙液中的缓蚀作用及机理。结果表明,HEDP对20SiMn钢在含1 mol/L NaCl饱和Ca(OH)2溶液中的缓蚀效果随HEDP浓度的升高存在极值,最佳浓度为1.441×10~(-4) mol/L。在此浓度下HEDP将20SiMn钢的钝性保持时间从6 h延长至9 h,缓蚀效率达到46.45%~59.78%。在发生点蚀的情况下,HEDP对点蚀的发展亦有显著的抑制作用,缓蚀效率超过93%。电化学和表面分析结果表明,HEDP优先吸附在钝化膜表面,通过竞争吸附机制屏蔽了侵蚀性Cl~-向钝化膜表面的附着,从而对其产生保护作用。 |
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其他语种文摘
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The corrosion of steel rebar in concrete will be induced once the passive film is destroyed by chlorides or carbonation. Several techniques have been employed to reduce the corrosion so far. Among them, adding inhibitors is effective one because of its advantages, such as high efficiency and easy handling. 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP), a typical organic phosphonic acid, is a low toxic corrosion inhibitor for steel and iron in neutral aerobic environment. This compound was first used as scale inhibitor in water treatment industry, such as cooling water circulation system. The molecule of HEDP has two phosphate groups, making it a powerful chelating ability with metallic ions. However, most of the current studies of HEDP focus on neutral or near-neutral systems, and there are few reports on the corrosion inhibition of steel reinforcement in alkaline environment. Therefore, it is not clear whether HEDP can play the role of corrosion inhibitor by protecting the passive film and resist foreign corrosive Cl~-. In this work, the inhibition effect of HEDP towards 20SiMn steel was investigated in simulated concrete pore solution contaminated by Cl– (Sat.Ca(OH)2+1 mol/L NaCl) by electrochemical methods (corrosion potential, potentiodynamic polarization curves, EIS and Mott-Schottcky curves) and surface analysis techniques (SEM, XPS). The results showed that HEDP was a mixed inhibitor and its inhibition efficiency increased first and then decreased with the increase of concentration, the optimal concentration is 1.441×10~(-4) mol/L. At the optimal concentration, HEDP could obviously enlarge the passive region, prolong the passive period of 20SiMn steel from 6 h to 9 h, and improve the charge-transfer resistance significantly with the inhibition efficiency around 46.45%~59.78%. When pitting corrosion occurs, HEDP could hinder its development with the inhibition efficiency over 93%. The inhibition mechanism was the preferential adsorption of HEDP over Cl~- by forming a complete adsorption film outside the passive film of the steel. |
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来源
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金属学报
,2020,56(6):898-908 【核心库】
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DOI
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10.11900/0412.1961.2019.00382
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关键词
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羟基亚乙基二膦酸
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腐蚀
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缓蚀剂
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吸附
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混凝土模拟孔隙液
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地址
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1.
中国科学院金属研究所, 沈阳材料科学国家研究中心, 沈阳, 110016
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天津职业技术师范大学机械工程学院, 天津市高速切削与精密加工重点实验室, 天津, 300222
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0412-1961 |
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学科
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金属学与金属工艺 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:6729615
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