【公開日：2025.06.10】【最終更新日：2025.05.05】
課題データ / Project Data
課題番号 / Project Issue Number
24UT1243
利用課題名 / Title
金属表面微細構造を利用した金属樹脂直接接合における金属表面の評価
利用した実施機関 / Support Institute
東京大学 / Tokyo Univ.
機関外・機関内の利用 / External or Internal Use
内部利用（ARIM事業参画者以外）/Internal Use (by non ARIM members)
技術領域 / Technology Area
【横断技術領域 / Cross-Technology Area】（主 / Main）計測・分析/Advanced Characterization（副 / Sub）-
【重要技術領域 / Important Technology Area】（主 / Main）マルチマテリアル化技術・次世代高分子マテリアル/Multi-material technologies / Next-generation high-molecular materials（副 / Sub）高度なデバイス機能の発現を可能とするマテリアル/Materials allowing high-level device functions to be performed
キーワード / Keywords
Hybrid joining, Surface treatment,異種材料接着・接合技術/ Dissimilar material adhesion/bonding technology,X線回折/ X-ray diffraction,ハイブリッドボンディング/ Hybrid Bonding,電子顕微鏡/ Electronic microscope,高品質プロセス材料/技術/ High quality process materials/technique
利用者と利用形態 / User and Support Type
利用者名（課題申請者）/ User Name (Project Applicant)
梶原 優介
所属名 / Affiliation
東京大学生産技術研究所機械・生体系部門
共同利用者氏名 / Names of Collaborators in Other Institutes Than Hub and Spoke Institutes
Ren Jiaxing,Chen Weiyan,Wang Shuohan,Ishioka Eigo
ARIM実施機関支援担当者 / Names of Collaborators in The Hub and Spoke Institutes
利用形態 / Support Type
（主 / Main）機器利用/Equipment Utilization（副 / Sub）,技術補助/Technical Assistance
利用した主な設備 / Equipment Used in This Project
UT-102：高分解能走査型分析電子顕微鏡
UT-105：高分解能走査型分析電子顕微鏡
報告書データ / Report
概要（目的・用途・実施内容）/ Abstract (Aim, Use Applications and Contents)
Polymer-metal structures can integrate materials with different properties and functionalities, which is particularly significant for lightweight applications. Techniques for achieving polymer-metal bonding without using mechanical fasteners or adhesives are becoming increasingly attractive.
Metal surface treatment is a critical step in these techniques. Our group has developed a “hot water treatment,” in which metal is immersed in hot water to form surface nanostructures that enhance bonding with polymers.
In this experiment, we investigated how the composition of the hot water affects the metal surface structure. We found that different pH levels and even tap water can influence the morphology of the surface structure.
実験 / Experimental
In this experiment, galvanized steel was used as the primary metal material. “Hot water treatment(75°C, 20 min)” at pH 7, PH9, pH 11 with DI water, and pH7 with tap water was performed on the galvanized steel. The metal surfaces were analyzed using the following equipment:
高分解能走査型分析電子顕微鏡（JSM-7800F-PRIME）
高分解能走査型分析電子顕微鏡(JSM-IT800SHL)
結果と考察 / Results and Discussion
Figure 1 shows the surface of the galvanized steel before any treatment. It is quite flat and has some staining. Such a surface does not form a physically meaningful bond with polymers. Therefore, we performed a surface treatment. The first step was pickling, as shown in Figure 2. After pickling, the stains and passivation film on the surface were removed, and micron-sized pores were formed, exposing a fresh galvanized layer to improve its reactivity with water. Next, we immersed the galvanized steel in water of different compositions. Figure 3 shows the surface structure after treatment in deionized water at pH 7. One can observe needle-like zinc nanostructures growing on the galvanized steel surface. Figures 4 and 5 respectively show the surfaces treated with water at pH 9 and pH 11. Compared to the pH 7 surface, the pH 9-treated surface forms denser but smaller structures. Under pH 11 conditions, longer needle-like structures are generated. These changes in structure size and shape are believed to be influenced by the concentration of OH- in the water. Figure 6 shows the surface treated with tap water at pH 7. Under these conditions, no long needle-like nanostructures were formed; the surface structure tends to be flake-like. It is presumed that ions such as F- and Cl- in tap water hinder the C-axis growth of the needle-like ZnO structures.
図・表・数式 / Figures, Tables and Equations
Fig. 1 SEM photograph of the surface of the galvanized steel before any treatment.
Fig. 2 SEM photograph of a surface treatment performed at the first step of pickling,
Fig. 3 SEM photograph of the surface structure after treatment in deionized water at pH 7.
Fig. 4 SEM photograph of the surfaces treated with water at pH 9.
Fig. 5 SEM photograph of the surfaces treated with water at pH 11.
Fig. 6 SEM photograph of the surface treated with tap water at pH 7
その他・特記事項（参考文献・謝辞等） / Remarks(References and Acknowledgements)
成果発表・成果利用 / Publication and Patents
論文・プロシーディング（DOIのあるもの） / DOI (Publication and Proceedings)
口頭発表、ポスター発表および、その他の論文 / Oral Presentations etc.
特許 / Patents
特許出願件数 / Number of Patent Applications：0件
特許登録件数 / Number of Registered Patents：0件