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

• 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
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥18,460,000 (Direct Cost: ¥14,200,000、Indirect Cost: ¥4,260,000); Fiscal Year 2019: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000); Fiscal Year 2018: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000); Fiscal Year 2017: ¥13,260,000 (Direct Cost: ¥10,200,000、Indirect Cost: ¥3,060,000)
• Keywords: アノード反応 / 腐食生成物 / 大気腐食 / 電気化学特性 / 顕微ラマン分光分析 / 電気化学測定 / 表面処理 / 亜鉛めっき鋼板 / 電気化学 / 表面改質

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.

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．

Research Products

• [Journal Article] 3．亜鉛系めっき鋼板の腐食と防食機構解析 (2018)
  • Author(s): 多田英司
  • Journal Title: Denki Kagaku Volume: 86 Issue: Autumn Pages: 211-219
  • DOI: 10.5796/denkikagaku.18-FE0021
  • NAID: 130007472291
  • ISSN: 2433-3255, 2433-3263
  • Year and Date: 2018-09-05
  • Peer Reviewed
• [Presentation] MgCl2水溶液中における炭素鋼のカソード反応に及ぼすZn2+イオンの影響 (2019)
  • Author(s): 多田英司，大井梓，西方篤
  • Organizer: 日本金属学会2019年秋期（第165回）講演大会
• [Presentation] MgCl2水溶液中におけるZnのアノード溶解反応機構 (2018)
  • Author(s): 多田英司，鶴巻佑実子，大井梓，西方篤
  • Organizer: 日本金属学会2018年秋期講演大会
• [Presentation] 亜鉛の腐食挙動におよぼすMg2+イオン濃度の影響 (2017)
  • Author(s): 多田英司，鶴巻佑実子，大井梓，西方篤
  • Organizer: 日本金属学会2017年終期講演大会（第161回）
• [Presentation] EIS behavior of Zn in aqueous solutions containing Mg2+ (2017)
  • Author(s): Eiji Tada, Yumiko Tsurumaki, Azusa Ooi, Atsushi Nishikata
  • Organizer: AEIS 2017
  • Int'l Joint Research / Invited
• [Funded Workshop] 236th ECS meeting (2019)