Research introduction [Steel structure]
Main research subject
Steel Structures
Corrosion
Fatigue
Fatigue fracture of corroded parts
Basic Research
Atmospheric exposure test
Evaluation tests for material deterioration over a real time axis in actual use environments (atmospheric environment, natural water such as seawater and freshwater, in soil, in plants, etc.) are essential for material development, elucidation of corrosion phenomena, and research on anticorrosion measures. It's a test. It is also the most reliable test for final confirmation of the effectiveness of corrosion resistance and anti-corrosion properties.
Coupled mechanism of film and steel corrosion
In this study, by conducting electrochemical tests on parametric model specimens for the corrosion state of the steel substrate, coating specifications, and deterioration scratches, we will elucidate the interaction between these mutual interferences and the electrochemical mechanism of the steel material.
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Surface Treatment
In order to extend the life of steel road bridges, it is important to ensure the quality of the surface preparation. Surface preparation is the process of removing deposits such as oil, fat, dust, salt, and corrosion products from the steel material to be painted. Methods for preparing steel substrates include mechanical methods, chemical methods, and optical methods.
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electrochemical corrosion sensor
We will develop a corrosion sensor that can quantitatively evaluate the progress of corrosion in adjacent coating flaws, taking into account various factors such as the corrosive environment of the structure, the corrosion state of the steel substrate, and the type and specifications of the coating.
Atmospheric sacrificial anodic protection
As a corrosion prevention method that does not require high-quality substrate preparation, we are developing atmospheric sacrificial anodic corrosion protection technology that uses an anode material and water-absorbing/water-retaining materials.
AWT (Abrasive Water-jet Treatment)
This is an ultra-high-pressure water multiphase fluid technology mixed with an abrasive that can be applied to corrosion products at the bottom of pitting corrosion in weathering steel, which are extremely difficult to remove. By establishing a new technology that is the first of its kind in Japan and overseas, the aim is to overcome the challenges faced by conventional technologies such as blasting, revive severely corroded components, and make anti-corrosion coatings more durable.
Bonding interface mechanism between CFRP and steel
A proposal for improving adhesive strength and durability using a reinforcing method that involves impregnating and bonding carbon fiber sheets with epoxy resin. We will also elucidate the galvanic corrosion mechanism of CFRP-steel materials and the coupled mechanism of adhesive interface deterioration and corrosion acceleration.
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Corrosion environment monitoring in rocket plume environment
In addition to elucidating the corrosivity of the rocket plume environment, we will also elucidate the effect it has on the progress of corrosion of steel materials and the deterioration of anticorrosive coatings. Based on this knowledge, we propose a maintenance management method for rocket launch site facilities.