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首页> 外文期刊>International Journal of Electrochemical Science >Effect of Alginate Additives on the Microstructure and Properties of Phytic Acid-based Conversion Coating on a Steel Surface
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Effect of Alginate Additives on the Microstructure and Properties of Phytic Acid-based Conversion Coating on a Steel Surface

机译：海藻酸钠添加剂对钢表面植酸基转化膜组织和性能的影响

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摘要

Phytic acid (PA) has a potential use as a coating on metal surface to retard corrosion. However, a loosestructure and micro-cracks in the phytic acid coating layer damage the tightness of the coating,providing channels for the infiltration of corrosive media and seriously weakening the protective effectof the coating. Sodium alginate (SA) was added as an accelerating agent to improve the anti-corrosionprotective effect and coating densification of the phytic acid coating on a Q235 steel surface. Themicro-morphology, elemental composition and elemental chemical state of different samples wereobserved by the surface analysis technologies of scanning electron microscopy (SEM) equipped withX-ray energy dispersive spectrum (EDS) and X-ray photoelectron spectroscopy (XPS), all of whichshow a dense and homogenous phytic acid film with lower crack was precipitated on the sampletreated by PA-SA conversion coating. Atomic force microscopy (AFM) and contact anglemeasurements were used to evaluate the adhesion properties of the prepared coating and the resultsshowed that the PA-SA coated steel exhibited better wettability and adhesion to the top layerscompared to the bare steel and phytic acid coating. The electrochemical measurements show that thecorrosion resistance of the conversion coating was markedly improved on the steel substrate treated byphytic acid conversion bath containing SA.
机译：植酸（PA）可以潜在地用作金属表面上的涂层以延缓腐蚀。然而，植酸涂层中的松散结构和微裂纹会破坏涂层的密封性，为腐蚀介质的渗入提供通道，并严重削弱涂层的保护作用。添加海藻酸钠（SA）作为促进剂，以改善Q235钢表面植酸涂层的防腐性能和涂层致密化。通过配备了X射线能量色散谱（EDS）和X射线光电子能谱（XPS）的扫描电子显微镜（SEM）的表面分析技术，观察了不同样品的微观形态，元素组成和元素化学状态，所有这些都显示出PA-SA转化膜处理后的样品上析出了致密，均质的具有较低裂纹的植酸膜。原子力显微镜（AFM）和接触角测量法用于评估所制备涂层的粘附性能，结果表明，与裸钢和植酸涂层相比，PA-SA涂层钢表现出更好的润湿性和对顶层的粘附性。电化学测量表明，在含有SA的植酸转化浴处理的钢基材上，转化膜的耐蚀性得到了显着提高。

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