Study of corrosion protection mechanism using electrical potential oscillation on interface between oil and water

2023 Fiscal Year Final Research Report

• Project/Area Number: 19K05370
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 32010:Fundamental physical chemistry-related
• Research Institution: University of Toyama
• Principal Investigator: Sunada Satoshi 富山大学, 学術研究部都市デザイン学系, 名誉教授 (00206575)
• Co-Investigator(Kenkyū-buntansha): 畠山 賢彦 富山大学, 学術研究部都市デザイン学系, 准教授 (30375109)
• Project Period (FY): 2019-04-01 – 2024-03-31
• Keywords: 防錆能力 / 電気化学 / 自励発振

Outline of Final Research Achievements

Parts with complex shapes, such as gears, are made of sintered Fe-Cu-C material, which is inexpensive and easily formed, but has the disadvantage of rusting easily in a hot and humid atmosphere. Therefore, rust-preventive oil is applied to prevent rusting. Until now, there has been no method to evaluate the performance of rust-preventive oil. The authors have developed an original method to evaluate the rust-preventive ability of rust-preventive oils. The method is a water film test. Using this method, we clarified the effect of the viscosity of rust-preventive oil on its rust-preventing ability. It was clarified that the viscosity of rust-preventive oil does not affect the rust-preventive ability, but effectively affects the ability of the surface-active agent added to the oil to incorporate water components. It was also confirmed that the rust-preventive ability of cutting oils for Mg alloys, which require rust-prevention, can be evaluated by the water film test.

Free Research Field

腐食防食

Academic Significance and Societal Importance of the Research Achievements

Fe-Cu-C焼結材料およびMg合金は，製造過程の短時間でも容易に錆びる材料には防錆油が必要であるが，その防錆能力を定量化する方法が今まで無かった．高性能ポテンショスタットを用いた水膜試験による電気化学測定により，再現性のある防錆能力の評価が可能になった．新開発水膜試験の研究成果を論文にしたため，水膜試験を世に広め，防錆添加剤の開発の効率化，それに伴う高性能防錆油の開発が可能になる．