Improvement of corrosion resistance of Zn-Mg-Al alloys by texture control

2019 Fiscal Year Final Research Report

• Project/Area Number: 17H03400
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Composite materials/Surface and interface engineering
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Tada Eiji 東京工業大学, 物質理工学院, 准教授 (40302260)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: アノード反応 / 腐食生成物 / 大気腐食 / 電気化学特性

Outline of Final Research Achievements

In this study, Zn and Zn-Mg alloys and Zn-Al-Mg alloys were prepared and their electrochemical and atmospheric corrosion properties were evaluated. As a result, it was shown that although there was no difference in the anodic reaction of each alloy, the corrosion rate was evaluated to be decreased by the combined addition of Al and Mg. In addition, a one-year exposure test was conducted on these alloys in an atmospheric corrosion environments, and it was shown that Zn-Mg alloy and Zn-Al-Mg alloy had better corrosion resistance than pure Zn. However, no clear difference was observed in the corrosion product films formed on the surface.

Free Research Field

材料加工・処理

Academic Significance and Societal Importance of the Research Achievements

本研究は，Zn系表面処理鋼板の耐食性向上に有効な添加元素であるといわれているMgやAlについて，その耐食性改善の原因について解明を目指したものである．そのため，細かく合金組成を変化させ，その電気化学特性や大気腐食特性を評価した．その結果，AlおよびMgの複合添加によって腐食速度が低下することが明らかになり，今後表面処理鋼板の耐食性向上に資する基礎データとなるといえる．