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首页> 外文会议>International Conference on Material Science and Engineering >Coating Thickness of Reinforced Concrete Affecting to Cathodic Polarization and Cyclic Voltammogram of Reinforced Steel
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Coating Thickness of Reinforced Concrete Affecting to Cathodic Polarization and Cyclic Voltammogram of Reinforced Steel

机译：钢筋混凝土涂层厚度影响钢筋钢的阴极偏振和循环伏安图

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摘要

The reinforced concretes are often exposed to severely corrosive environments such as sea water, contaminated water, acid rain and seashore etc.. Therefore, the reinforced steel bar embedded in the concrete is increasingly corroded in various environments mentioned above, and this corrosion problem is thought to be very important in terms of the safety and economic points of view. In this study, a multiple mortar test specimen(W/C:0.5) with variation of coating thickness was prepared and immerged in flowing seawater for five years. And, the effects of coating thickness affecting to cathodic polarization and cyclic voltammogram were investigated using electrochemical methods. The thinner coating thickness, both invasion and diffusion of dissolved oxygen, water and chloride ion on the surface of reinforced steel bar is more easily compared to the thicker coating thickness. Thus, at the beginning of immersion, the rate of corrosion in the case of the thinner coating thickness is higher than that of the thicker coating thickness. However, it is considered that corrosion products deposited on the surface due to higher corrosion rate played the role as a resistance polarization, and increased the diffusion layer, as a result, decreased the corrosion current density compared to the thicker coating thickness. Consequently, the relationship between corrosion current density and the coating thickness were not well in good agreement with each other due to the corrosion products after being immersed for 5 years. Therefore, in order to more optimum evaluate for corrosion possibility of the reinforced steel embedded in the concrete, not only corrosion potential but also other parameters such as coating thickness, W/C ratio, and other corrosion environment should be investigated in the case of immersed in seawater for long years.
机译：钢筋混凝土通常暴露于严重腐蚀性环境，如海水，污染的水，酸雨和海岸等。因此，嵌入混凝土中的增强钢筋在上述各种环境中越来越腐蚀，并且这种腐蚀问题被认为是思考在安全和经济观点方面非常重要。在该研究中，制备具有涂层厚度变化的多砂浆试样（W / C：0.5），并浸入流动的海水中五年。并且，使用电化学方法研究了影响阴极偏振和循环伏安图的涂层厚度的影响。与厚度厚度相比，较薄的涂层厚度，溶解氧，水和氯离子的溶解氧，水和氯离子的扩散更容易。因此，在浸入开始时，在较薄的涂层厚度的情况下腐蚀速率高于厚度厚度的速度。然而，认为由于腐蚀速率更高的腐蚀速率，沉积在表面上的腐蚀产物作为电阻偏振的作用，结果增加了与厚度厚度相比的腐蚀电流密度降低。因此，由于浸入5年后，腐蚀电流密度与涂层厚度之间的关系并不好，彼此均匀一致。因此，为了更优选地对混凝土中嵌入的增强钢的腐蚀可能性进行腐蚀的可能性，不仅应该在浸入的情况下研究腐蚀潜力，而且还应研究其他参数，例如涂层厚度，W / C比和其他腐蚀环境在海水中长期。

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