The corrosion resistance of electrolytic zinc-coating on mild steel in seawater was investigated. Mild steel samples were zinc electroplated at voltage varied (0.6, 0.8, 1.0, 1.5 V) and for plating time also varied (20, 30, 40, 50, 60 minutes). Focused ion-beam scanning electron microscopy was used to observe the surface morphology of the plated surface. The visual observation of plated samples revealed that samples plated at 0.6 V for 20 and 60 minutes; 0.8 V for 30 minutes and 1.0 V for 40 minutes showed the best physical properties such as colour, brightness, fineness, streak and strong adhesion. The plated samples were then subjected to seawater environment for 30 days. The electro-potentials mV (SCE) was measured daily. Weight loss was determined at intervals of five days for the duration of the exposure period. Experimental result showed little corrosion attack on the zinc-plated samples on the fifteenth and twenty-fifth day’s exposure. The severity of attack decreases with increasing weight of zinc coated on substrate. Significant increases in the corrosion resistance were achieved for the plated samples compared with that of the substrate. The pH of the seawater became more alkaline at the end of the thirty days test.
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机译：研究了海水中低碳钢上电解镀锌层的耐蚀性。在变化的电压（0.6、0.8、1.0、1.5 V）下电镀低碳钢样品，并且电镀时间也变化（20、30、40、50、60分钟）。使用聚焦离子束扫描电子显微镜观察镀覆表面的表面形态。对镀覆样品的肉眼观察表明，样品在0.6 V的条件下镀覆20和60分钟； 0.8 V 30分钟和1.0 V 40分钟显示出最佳的物理性能，例如颜色，亮度，细度，条纹和强附着力。然后将电镀的样品置于海水环境中30天。每天测量电势mV（SCE）。在暴露期间以五天的间隔确定体重减轻。实验结果表明，在暴露的第十五和第二十五天，对镀锌样品的腐蚀几乎没有。侵蚀的严重程度随涂覆在基材上的锌的重量增加而降低。与基材相比，镀层样品的耐腐蚀性显着提高。在三十天的测试结束时，海水的pH值变得更碱性。
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