MgO-SiO2粘结剂悬浮液中钢表面钝化层的表征

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-06-26 DOI:10.1016/j.corsci.2025.113149

Bharati , Dirk Engelberg , Cise Unluer

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引用次数: 0

摘要

与硅酸盐水泥（PC）相比，MgO-SiO2粘结剂本身具有较低的pH值，这引起了人们对其在钢筋结构应用中的适用性的担忧。为了解决这一问题，本研究研究了在六偏磷酸钠（SHMP）存在的情况下，MgO-SiO2粘结剂对钢的钝化作用。六偏磷酸钠（SHMP）改善了和易性，提高了ph值，并对MgO-SiO2中SHMP和加碱对钢的钝化作用进行了评价。采用电化学阻抗谱（EIS）、拉曼光谱（Raman）、低kv背散射电子（BSE）扫描和x射线光电子能谱（XPS）对钢表面钝化层的形成进行了表征。所得结果表明，在SHMP存在的情况下，钢表面形成了一个保护钝化层，并且在与SHMP或碱混合的情况下没有腐蚀。碱的加入也改善了MgO-SiO2体系中钢的钝化。虽然含有SHMP/碱的MgO-SiO2体系中的钝化层与PC样品中的钝化层相似，但其组成和厚度的差异是突出的。

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Characterisation of passive layer on steel immersed in MgO-SiO2 binder suspension solution

MgO-SiO₂ binders inherently have lower pH compared to Portland cement (PC), raising concerns about their suitability for structural applications involving steel reinforcement. To address this concern, this study investigated steel passivation in MgO-SiO₂ binders in the presence of sodium hexametaphosphate (SHMP), which improves workability and increases pH. The combined effect of SHMP and alkali addition in MgO-SiO₂ on steel passivation was also evaluated. Passive layer formation on steel was characterised with electrochemical impedance spectroscopy (EIS), Raman spectroscopy, low-kV backscattered electron (BSE) scanning and x-ray photoelectron spectroscopy (XPS). The obtained results demonstrated the formation of a protective passive layer on steel in the presence of SHMP, along with the absence of corrosion in mixes with SHMP or alkalis. Alkali addition also improved steel passivation in MgO-SiO₂ systems. While the passive layer in the MgO-SiO₂ system containing SHMP/alkalis was similar to those present in PC samples, differences in its composition and thickness were highlighted.

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.