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Polarization and impedance studies on zinc phosphate coating developed using galvanic coupling

机译:电流耦合对磷酸锌涂层的极化和阻抗研究

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摘要

Galvanic coupling technique is capable of producing coatings of desired thickness. Good quality coatings can be produced at low temperature. Galvanic coupling of mild steel (MS) with the other cathode materials such as titanium (Ti), copper (Cu), brass (BR), nickel (Ni), and stainless steel (SS) accelerates iron dissolution, enables quicker consumption of free phosphoric acid and facilitates an earlier attainment of point of incipient precipitation, resulting in a higher amount of coating formation. In the present investigation, potentiodynamic polarization and electrochemical impedance spectra on MS substrates phosphated using galvanic coupling are studied. This study reveals that MS substrates phosphated under galvanically coupled condition possess better corrosion resistance than the substrates phosphated under uncoupled condition.
机译:电流耦合技术能够产生所需厚度的涂层。可以在低温下生产高质量的涂料。低碳钢(MS)与其他阴极材料如钛(Ti),铜(Cu),黄铜(BR),镍(Ni)和不锈钢(SS)的电流偶合可加速铁的溶解,从而更快地消耗游离态磷酸,并有助于较早达到初期沉淀点,从而导致形成大量涂层。在本研究中,研究了通过电耦合磷酸化的MS基板上的电位动力学极化和电化学阻抗谱。这项研究表明,在电耦合条件下磷酸盐化的MS基材比在非耦合条件下磷酸盐化的基材具有更好的耐腐蚀性。

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