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首页> 外文期刊>International Journal of Electrochemical Science >Influence of Anion and pH on the Electrochemical Co-Deposition and Transformation of Iron Oxy-Hydroxide
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Influence of Anion and pH on the Electrochemical Co-Deposition and Transformation of Iron Oxy-Hydroxide

机译：阴离子和pH值对羟基氧化铁电化学共沉积和相变的影响

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Goethite (FeOOH) and lepidocrocite (FeOOH) are two common iron and steel corrosion products.The study of goethite and lepidocrocite is an interesting way to better understand the corrosionprocesses of iron and its behaviour in different environments. In this work the co-deposition of ironoxides and their transformation on inert subtracts were studied at room temperature. The films were- 2- 2+ obtained by electro-deposition using solutions containing Cl , SO4 and Fe at different pH onplatinum disks. Linear polarisation, amperommetry, electrochemical impedance and spectroscopytechniques were used in this study. Anodic polarisation curves showed a current shoulder at lowanodic polarisation and a current peak at higher polarisation. The shoulder observed at low anodic2+ 3+ polarisation corresponded to the formation of a precursor compound like Fe -Fe hydrated oxide,which is later transformed to an oxy-hydroxide compounds. The electrodeposition of goethite andlepidocrocite occurs, firstly through formation of a green rust film, characterised by a shoulder in thepolarisation curves, and subsequently through formation of an iron oxy-hydroxide film. The anion andthe pH of the electrolyte played an important role in the formation and further transformation of the- iron oxides compounds on the film. It was corroborated that the Cl ions and high pH stimulated the2- green rust and final oxyhydroxide film formation, while the SO4 ions and low pH retarded theformation of these compounds.
机译：针铁矿（FeOOH）和纤铁矿（FeOOH）是两种常见的钢铁腐蚀产物。针铁矿和纤铁矿的研究是更好地了解铁在不同环境下的腐蚀过程及其行为的有趣方式。在这项工作中，在室温下研究了氧化铁的共沉积及其在惰性减法上的转化。通过使用含Cl，SO4和Fe的溶液在不同pH的铂金片上通过电沉积获得的薄膜为2-2 +。在这项研究中使用了线性极化，安培法，电化学阻抗和光谱技术。阳极极化曲线显示低阳极极化时的电流肩峰和较高极化时的电流峰。在低阳极2+ 3+极化下观察到的肩峰对应于前体化合物的形成，例如Fe -Fe水合氧化物，随后被转化为羟基氧化物。针铁矿和片云铁矿的电沉积首先通过形成生铁锈膜（其极化曲线中的肩部为特征），然后通过形成羟基氧化铁膜来进行。电解质中的阴离子和pH值在薄膜上铁氧化物化合物的形成和进一步转化中起着重要作用。证实了Cl离子和高pH刺激了2-绿锈和最终的羟基氧化物膜的形成，而SO4离子和低pH则阻碍了这些化合物的形成。

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