"In-situ" Measurement of Corrosion Rate of Zinc-5% Alluminum Alloy Plated Steel Sheet by Using AE Method

在实验室中，金属在类解决方案中的腐蚀率是通过使用腐蚀重量损失测量方法、极化阻力测量和极化曲线测量来衡量的。However，这些方法不能用作“现场”测量。与腐败率有关。Since corrosion rate changes greatly with various environmental conditions， development of the new method for“in-situ”mesurement is desired。我们已经研究了钢中的氢损伤，通过天主教极化使用声学发射（AE）方法进行了研究。在天主教极化期间， AE在腐蚀反应中产生，被检测到，并添加到AE结果中的氢损伤。考虑到AE在被检测到的地方，AE被估计会发生氢气的反应;在另一边，钢片的加压化已经被携带出来，以提高抗腐蚀性的目标，以及锌片的钢sh。 ... More 电子产品被用作建筑材料，以及电气产品和汽车的外面板。在订购设计可使用的周期，并在更多的环境中使用，在抗腐蚀性方面开发出了更好的植入过程，并在锌-铝、锌-镍等方面进行了改进。锌-5%铝合金合金钢板在抗腐蚀性方面更高。它报告说，corrosion抗性是由aluminum to zinc改进的，并且改进是由Zn_6Al_2（OH）<16>_CO_3·4H_2O和ZnCl_2·4 Zn（OH）_2H_2O as corrosion products。好吧，改进的原因对细节来说还不清楚。由于锌合金与高腐蚀抵抗力的开发，这很重要，因为它是由铝合金引起的腐蚀抵抗力的改善的原因。在目前的工作中，后续的调查（1）由于AE在各种解决方案中检测到的Corrodingmetal specimen，特别是我们的估计，AE是由氢气体的演变引起的，（2）应用程序of the AE method to“in-situ”measurement of corrosion rate， （3）应用程序of the equipment measuring corrosion rate under the“in-situ”condition by using the AE method， and （4）the corrosion process of zinc-5%aluminum alloy plated steel sheet in aqueous solutions。Less（低）

In laboratory, the corrosion rate of metals in aqueous solutions is measured by using the methods of corrosion weight loss measurement, polarization resistance measurement and a polarization curve measurement. However, these methods cannot be used as the "in-situ" mesurement. of the corrosion rate. Since corrosion rate changes greatly with various environmental conditions, development of the new method for "in-situ" mesurement is desired. We have investigated the hydrogen damage in steels caused by cathodic polarization using the acoustic emission (AE) method. During the cathodic polarization, AE generated in a corrosion reaction was detected in addition to AE resulting from hydrogen damage. Consideration of the corrosion environment where the AE was detected, the AE was estimated to be due to the evolution reaction of hydrogen gas.On the other hand, galvanizing of steel sheets has been carried out for the purpose of improvement of the corrosion resistance, and the zinc-plated steel sh … More eets have been used as building materials, and outer panel of an electric product and an automobile. In order to protract the usable period and use in more severe environment, the more excellent plating process in corrosion resistance has been developed, and zinc-alloy plating of zinc-aluminum, zinc-nickel, etc. has been performed. The zinc-5%aluminum alloy plated steel sheet is higher in corrosion resistance. It is reported that the corrosion resistance is improved by alloying of aluminum to zinc, and the improvement is owing to formation of corrosion protective films of Zn_6Al_2(OH)_<16>CO_3・4H_2O and ZnCl_2・4Zn(OH)_2H_2O as corrosion products. However, a reason of the improvement is not clear for details. For development of the zinc alloy plating with higher corrosion resistance, it is important to clarify the reason of the improvement in corrosion resistance caused by alloying of aluminum.In the present work, the following were investigated (1)the cause of AE detected for the corroding metal specimen in aqueous solutions, especially our estimation that the AE is caused by the evolution of hydrogen gas, (2)application of the AE method to "in-situ" measurement of corrosion rate, (3)development of the equipment measuring corrosion rate under the "in-situ" condition by using the AE method, and (4)the corrosion process of zinc-5%aluminum alloy plated steel sheet in aqueous solutions. Less