Formation of corrosion-resistant and flexible film on flame-resistant Mg alloy by high-speed liquid injection

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K15063
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 26050:Material processing and microstructure control-related
• Research Institution: Nihon University
• Principal Investigator: NAKAMURA Kae 日本大学, 理工学部, 助教 (10772741)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: マグネシウム / 耐食性被膜 / 表面処理 / 生体埋植材

Outline of Final Research Achievements

This research (1) formed trial films containing biodegradable polymers and (2) examined the surface treatment system using a liquid high-speed jet. In (1), to examine whether organic matter can be included in the anticorrosion films formed on the pure Mg substrates, the ones were formed by a hydrothermal synthesis method using L-aspartic acid as biodegradable polymer. As a result, nitrogen (N) derived from L-aspartic acid was detected in the film in addition to the main component of it Mg(OH)2. The analysis results suggest that the film is composed of magnesium carbonate MgCO3, magnesium acetate Mg(CH3COO)2, and magnesium L-aspartate Mg(C4H6NO4)2. In (2), two kinds of apparatuses were developed and examined as follows. The first was that injects high-pressure vapor generated by heating a solution in a metal container, and another was for reacting steam with a metal substrate while heating the metal substrate in a steam environment.

Free Research Field

表面工学

Academic Significance and Societal Importance of the Research Achievements

本研究で開発しようとする成膜手法は，蒸気と金属の反応によって，防食被膜を形成し，さらに，蒸気源に生分解性ポリマーを混合することで，被膜に，人体に無害な有機物を含有させようとするものである．本研究で検討中の，溶液噴射による運動エネルギーを化学反応に利用しようとする着想は，蒸発しにくい物質も溶液中に混合させて噴射することが可能である．さらに，本技術の確立により，Mg 合金のみならず様々な金属材料への展開が期待できることから，金属に対する表面処理で，これまで作ることができなかった皮膜成分，および機能が創成可能となる等の，科学技術への波及効果が期待できる．