TENSILE PROPERTIES OF SURFACE MODIFIED BAMBOO SLICES COATED WITH EPOXY RESIN CONSIDERING THE CORROSION OF ACID AND ALKALI ENVIRONMENT

This paper presents an anticorrosive method to protect bamboo from the corrosion induced by coating a layer of epoxy resin on the surface of bamboo slices. Four surface modifications including heat treatment, alkali treatment, coupling treatment and acetylation treatment are applied to bamboo slices. The results indicate that the ultimate tension of bamboo slices decreases when corroded in solutions with different pH for different time, while epoxy resin protects the bamboo slices from corrosion to maintain the tensile properties by coated on its surface. The surface morphology indicates that four modifications have different degrees of influence on the surface and material of bamboo slices, which can reduce the ultimate tension of bamboo slices, but improve the interfacial combination between the surface of bamboo slices and epoxy resin. Acetylation treatment was the most effective modification analysed by Fourier-transform infrared spectroscopy (FT-IR) among them.

Rapid Dissolution of Secondary Phase in Cold-Rolling Al-Cu-Mg Alloy by Electropulsing Treatment

The Al-Cu-Mg alloy is a precipitation-strengthening alloy, which is traditionally dissolving lots of secondary phase and precipitating in subsequent aging process, thus having been applied to aerospace and automobile industry due to its low density and high strength. However, the high temperature and long operating time needed for the dissolution of secondary phase consume numerous energy. In this work, rapid dissolution of secondary phase in cold-rolling Al-Cu-Mg alloy was achieved by coupling treatment of thermal field and pulsed electric current. The energy consumption for dissolving secondary phasewas reduced from 495°C operating 1h to 450°C operating several minutes. Therefore, the coupling treatment of thermal field and pulsed electric current significantly improves the dissolving rate and decreases the energy consumption.