"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，通过腐蚀失重法、极化电阻法和极化曲线法测量金属在水溶液中的腐蚀速率。然而，这些方法不能用作“原位”测量。的腐蚀速率。由于腐蚀速率随环境条件变化很大，因此需要开发“原位”测量的新方法。利用声发射（AE）方法研究了阴极极化引起的钢中氢损伤。在阴极极化过程中，除了氢损伤引起的AE外，还检测到腐蚀反应中产生的AE。考虑到检测到AE的腐蚀环境，估计AE是由于氢气的析出反应引起的。另一方面，为了提高耐腐蚀性，对钢板进行了镀锌，镀锌钢板的耐腐蚀性较差。 ...更多信息 EETS已被用作建筑材料以及电子产品和汽车的外板。为了延长使用寿命和在更恶劣的环境中使用，开发了耐腐蚀性能更优异的电镀工艺，进行了锌铝、锌镍等锌合金电镀。镀锌-5%铝合金的钢板具有较高的耐腐蚀性。铝锌合金化提高了铝合金的耐蚀性，其原因是在铝合金表面形成了Zn_6Al_2（OH）<16>_CO_3·4H_2O和ZnCl_2·4 Zn（OH）_2H_2O等腐蚀产物保护膜。然而，改善的原因尚不清楚细节。为了开发具有更高耐蚀性的锌合金镀层，阐明铝合金化提高锌合金镀层耐蚀性的原因是非常重要的，本工作研究了（1）在水溶液中腐蚀金属试样检测到的AE的原因，特别是我们估计AE是由氢气的释放引起的，（2）声发射法在腐蚀速率“原位”测量中的应用;（3）声发射法“原位”测量腐蚀速率装置的研制;（4）镀锌-5%铝合金钢板在水溶液中的腐蚀过程。少