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首页> 外文期刊>International Journal of Electrochemical Science >Corrosion Inhibition Effect of Phosphate on Fine-grain High- strength Reinforcement in Simulated Concrete Pore Solutions with Carbonation and Chloride-intrusion
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Corrosion Inhibition Effect of Phosphate on Fine-grain High- strength Reinforcement in Simulated Concrete Pore Solutions with Carbonation and Chloride-intrusion

机译：磷酸盐对碳化和氯化物侵入的混凝土细孔溶液中细晶高强度钢筋的缓蚀作用

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摘要

The passivation performance of fine-grain high-strength (HRBF500) reinforcement in simulated concrete pore (SCP) solutions was seriously impaired by carbonation and chloride-intrusion of 3? ? concrete. Phosphate was used as corrosion inhibitor and the effect of [PO4 ]/[Cl ] ratio was investigated. The corrosion properties of HRBF500 reinforcement were investigated via potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). The semiconductor features of the corrosion products were studied according to Mott–Schottky theory. The results show that the anodic corrosion process of HRBF500 reinforcement can be greatly inhibited by sufficient high phosphate concentration, while the influence on the cathodic process is generally smaller. The corrosion products on HRBF500 reinforcement manifest as n-type 3? ? semiconductors. With the increase in [PO4 ]/[Cl ] ratio, the donor concentration ND decreases, while the efficiency of corrosion protection first increases considerably and then tends to be stable. The compactness of the corrosion products is also enhanced. For the case with 0.6 mol?L?1 Cl? but without ?2 carbonation (pH ≈ 12.5), the corrosion current density icor decreases from 13.2 to 0.40 μA·cm at 3? ? ? ?1 [PO4 ]/[Cl ] = 1.0, while for pH = 10.5 and [Cl ] = 0.3 mol?L (more aggressive), icor is still up to ?2 ?2 3? ? 0.80 μA·cm and decreases to 0.42 μA·cm at [PO4 ]/[Cl ] = 4.0. Therefore, to obtain better corrosion protection under the combined action of carbonation and chloride-intrusion, a higher phosphate concentration is required.
机译：3？的碳化和氯化物侵入严重削弱了细粒高强度钢筋（HRBF500）在模拟混凝土孔隙（SCP）溶液中的钝化性能。 ？具体。用磷酸盐作为缓蚀剂，研究了[PO4] / [Cl]比的影响。通过电位动力学极化，电化学阻抗谱（EIS）和扫描电子显微镜（SEM）研究了HRBF500增强材料的腐蚀性能。根据Mott–Schottky理论研究了腐蚀产物的半导体特性。结果表明，足够高的磷酸盐浓度可以大大抑制HRBF500增强材料的阳极腐蚀过程，而对阴极过程的影响通常较小。 HRBF500钢筋上的腐蚀产物表现为n型3？ ？半导体。随着[PO 4] / [Cl]比的增加，施主浓度ND降低，而防腐蚀效率首先显着提高然后趋于稳定。腐蚀产物的致密性也得到增强。对于0.6 mol？L？1 Cl？的情况但在没有？2碳化（pH≈12.5）的情况下，腐蚀电流密度icor在3？时从13.2降至0.40μA·cm。 ？ ？ Δ1[PO4] / [Cl] ＝ 1.0，而当pH ＝ 10.5且[Cl] ＝0.3molΔL（更具侵略性）时，icor仍高达Δ2≤23。 ？在[PO4] / [Cl] = 4.0时为0.80μA·cm，并降至0.42μA·cm。因此，为了在碳化和氯化物侵入的联合作用下获得更好的腐蚀保护，需要更高的磷酸盐浓度。

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