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

“原位”%20Measurement%20of%20Corrosion%20Rate%20of%20Zinc-5%%20Alluminum%20Alloy%20Plated%20Steel%20Sheet%20by%20Using%20AE%20Method

• 批准号: 14550714
• 负责人: HAGI Hideki
• 金额: $ 2.3万
• 依托单位: Fukui University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550714/
• 关键词: Corrosion Rate; Acoustic Emission; Corrosion Process; Zinc Alloy Plated Steel; Surface Analysis; Corrosion Potential; Corrosion Mechanism; Chlorine Ion

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

在实验室中，使用腐蚀的方法，极化曲线测量和极化曲线测量，这些方法无法用作腐蚀速率。我们研究了使用声发射（AE）方法引起的氢损伤。另一方面，钢化钢的目的是改善腐蚀性的目的，而镀锌钢进行了镀锌，并且将电动产品的外面板和外部面板用于自动摩托车由于Zn_6Al_2的腐蚀形成（OH）_ <16> CO_3 / 4H_2O和ZNCL_2，4ZN（OH）_2H_2O作为折叠产品，但要开发具有较高较高校准的锌。在目前的工作中，研究了以下工作（1）检测到水性腐蚀金属标本的AE的原因，尤其是我们估计AE是由AE检测到的AE的原因（1）氢气，（2）将方法应用于“原位”测量折叠率，（3）通过使用该方法在“原位”离子下测量折叠率的开发，以及（4）腐蚀水溶液中的锌-5％铝合金钢板的过程