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首页> 美国卫生研究院文献>The Scientific World Journal >Effects of pH Value of the Electrolyte and Glycine Additive on Formation and Properties of Electrodeposited Zn-Fe Coatings
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Effects of pH Value of the Electrolyte and Glycine Additive on Formation and Properties of Electrodeposited Zn-Fe Coatings

机译：电解质和甘氨酸添加剂的pH值的影响电沉积锌铁涂层的形成与性能研究

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摘要

Environmentally friendly and cyanide-free sulfate bath under continuous current and the corrosion behavior of electrodeposits of zinc-iron alloys were studied by means of electrochemical tests in a solution of 3.5% NaCl in presence and absence of glycine. The effects of pH on the quality of Zn-Fe coatings were investigated in order to improve uniformity and corrosion protection performance of the coating films. The deposit morphology was analyzed using scanning electron microscopy (SEM), and X-ray diffraction (XRD) was used to determine the preferred crystallographic orientations of the deposits. It was found that the uniformity and corrosion resistance of Zn-Fe coating films were strongly associated with pH of the coating electrolyte. To obtain the effect of pH on the film quality and corrosion performances of the films, the corrosion test was performed with potentiodynamic anodic polarization method. It was also observed that uniformity and corrosion resistivity of the coating films were decreased towards pH = 5 and then improved with increasing pH value of the electrolyte. The presence of glycine in the plating bath decreases the corrosion resistance of Zn-Fe coatings.
机译：在存在和不存在甘氨酸的条件下，通过在3.5％NaCl溶液中进行电化学测试，研究了在连续电流下的环保型无氰硫酸盐浴以及锌铁合金电沉积物的腐蚀行为。研究了pH值对Zn-Fe涂层质量的影响，以提高涂膜的均匀性和防腐性能。使用扫描电子显微镜（SEM）分析沉积物的形态，并使用X射线衍射（XRD）确定沉积物的优选晶体学取向。已经发现，Zn-Fe涂层膜的均匀性和耐腐蚀性与涂层电解质的pH密切相关。为了获得pH对膜质量和膜的腐蚀性能的影响，用电位动力学阳极极化法进行腐蚀试验。还观察到，涂膜的均匀性和耐腐蚀性在pH ＝ 5时降低，然后随着电解质的pH值升高而提高。电镀液中甘氨酸的存在会降低Zn-Fe涂层的耐腐蚀性。

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