Corrosion-Induced Performance Degradation of Phosphorus-Containing Scale Inhibitors at Carbon Steel–Water Interface,Industrial & Engineering Chemistry Research

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Corrosion-Induced Performance Degradation of Phosphorus-Containing Scale Inhibitors at Carbon Steel–Water Interface
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-03-27 00:00:00 , DOI: 10.1021/acs.iecr.8b00223
Tianzhen Zhu ₁ , Lida Wang ₁ , Wen Sun ₁ , Zhengqing Yang ₁ , Suilin Wang ₂ , Yingzheng Zhou ₃ , Shaohui He ₃ , Yaowei Wang ₄ , Guichang Liu ₁

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Phosphorus-containing scale inhibitors have been widely used to mitigate CaCO₃ scaling on the surface of metal device. In this work, the antiscale performances of two typical additives, sodium salts of hexametaphosphate (SHMP) and ethylenediaminetetramethylene phosphonate (EDTMPS), were evaluated on carbon steel through comparing scaling behavior under self-corrosion and cathodic polarization conditions, respectively. Results reveal that anodically released Fe²⁺ ions exert important influences on their antiscale behavior at carbon steel–water interface. During cathodic polarization processes, fewer or no Fe²⁺ ions are produced at the interface, and the two inhibitors effectively retard scale formation by their chelating role. However, once electrochemical corrosion occurs, more Fe²⁺ ions released from anode tend to diffuse toward cathodic regions, strongly interfering in their antiscale performances by preferentially replacing interfacial chelated Ca²⁺ ions. Then, these liberated Ca²⁺ ions are forced to react with cathodically formed CO₃^2– ions, resulting in the scaling of CaCO₃ at carbon steel–water interface.

中文翻译：

碳钢-水界面处含磷阻垢剂的腐蚀诱导性能下降

含磷的阻垢剂已被广泛用于减轻金属器件表面的CaCO ₃结垢。在这项工作中，分别通过比较自腐蚀和阴极极化条件下的结垢行为，对碳钢上的两种典型添加剂六偏磷酸钠（SHMP）和乙二胺四亚甲基膦酸酯（EDTMPS）的防垢性能进行了评估。结果表明，阳极释放的Fe ²⁺离子对其在碳钢-水界面的抗垢性能产生重要影响。在阴极极化过程中，Fe ²⁺很少或没有离子在界面处产生，这两种抑制剂通过其螯合作用有效地抑制了水垢的形成。然而，一旦发生电化学腐蚀，从阳极释放的更多的Fe ²⁺离子趋向于向阴极区域扩散，通过优先替换界面螯合的Ca ²⁺离子强烈地干扰了它们的抗垢性能。然后，这些释放的Ca ²⁺离子被迫与阴极形成的CO ₃^2–离子发生反应，从而导致碳钢-水界面处的CaCO ₃结垢。

更新日期：2018-03-28

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