Recently, in Japan, an increasing number of community structures that have been built more than 50 years ago have required appropriate management to maintain their functionality. The painted steel structures are regularly repainted to maintain their corrosion resistance. Excellent corrosion resistance can be achieved by thoroughly removing the rust and residual coating film on the steel surface during surface preparation using either blasting or wire brush treatment. The wire brush treatment is very workable even when there is a problem with corrosion resistance after coating. This research examined surface preparations using three different types of wire brush treatments. Furthermore, the organic zinc-rich paint was applied to steel plates that had undergone different surface preparations, and the corrosion resistance of each painted steel plate was investigated by accelerated corrosion testing. The results demonstrated that the paint sample that was subjected to surface preparation using either a nickel- or zinc-plated steel wire wheel brush exhibited better corrosion resistance than that exhibited by the one subjected to surface preparation using a steel wire wheel brush without plating. This was caused by the difference between the corrosion barrier properties of the zinc-based corrosion product layers that were formed in the painted samples.
Azulenes are composed of a characteristic fused five-seven bicyclic aromatic ring system and are a representative class of nonbenzenoid aromatic compounds. The ring system, unlike benzenoid aromatic ring systems, shows a high reactivity toward not only electrophilic but also nucleophilic reagents, owing to the presence of the aromatic seven-membered ring regarded as cycloheptatrienyl cation. Over the last decade our group has been involved in the synthesis of azulene and its derivatives.
Battery is one of the key technology for environmental-conscious vehicles. A high performance battery can be obtained by keeping effective electrochemical reaction under control of suitable conditions. Various conditions must be cleared to satisfy this requirement. One of condition is to control electrode materials. Investigations of new chemicals are major way as chemical method, on the other hand, the utilization of fine solid, i.e. powder, is applying as physical method. Powders can promote chemical reactions due to its huge specific surface area. Shorten transportation time of ion in solid, because the distance between inside of solid and the surface is short, can give better performance for battery.
Therefore powder technologies are applying to manufacture and R&D of major materials for secondary batteries and fuel cells. I'll introduce the role of powder technology for manufacturing/R&D of synthesis process of active materials, post processing of active materials, and evaluation of electrode, respectively.
Pigments used as raw materials for inks and paints are typically in an aggregated state induced by drying processes used in their production. Aggregated pigments are disintegrated to the intended particle size and dispersed in the vehicle. In the manufacture of inks and paints, the process of pigment dispersion is critical. There are various kinds of dispersion machines used in the process. Among them, a wet bead mill is one of those with the highest efficiency.
In this report, the characteristics of wet bead mills and the method for highly efficient dispersion using a wet bead mill is explained.