Khả năng bảo vệ chống ăn mòn thép cacbon của màng sơn epoxy giàu kẽm kết hợp với ống nano cacbon

The zinc rich epoxy coatings containing cacbonnanotube (CNT) concentrations ranged from 0.5 to 3 % were studied. Morphology of the zinc pigments was examined by scanning electron microscopy (SEM). Mechanical properties as impact and adhesion of the zinc rich epoxy containing CNT were excellent in comparison with zinc rich epoxy. The corrosion protection behaviour of a zinc-rich epoxy coating containing CNT in 3 % NaCl solution was study by Electrochemical Impedance Spectroscopy (EIS) and the salt fog Testing. The EIS results and the Salt Fog testing show that the ability to corrosion protection of the zinc coating has been increased in the presence of 1 % of the CNT

Ảnh hưởng của nanocompozit CNT/ZnO đến khả năng bảo vệ của màng sơn polyuretan dưới bức xạ của tia tử ngoại

The deposition of ZnO on CNTs has been prepared by a sol–gel method. The CNT/ZnO nanocomposites synthesized were characterized by Fourier Transform Infrared (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM) methods. The analyses show that the nano ZnO deposition on CNT was crystalline in the form of hexagonal wurtzite structure. The average particle size of ZnO deposition on CNT is about 10 nm. The CNT/ZnO nanocomposites were incorporated into a polyurethane coating for improving the UV resistance of the coating. The Electrochemical Impedance Spectroscopy (EIS) measurement was performing during UV exposure for characterize the UV resistance of the coating. The corrosion resistance of polyurethane coatings containing 0.1 wt.% CNT/ZnO in UV radiation was higher than that polyurethane and polyurethane coatings containing CNT or ZnO at the same rate. Keywords. Carbon nanotube, nano ZnO, nano composite CNT/ZnO, polyurethane, UV resistance

Tổng hợp hydrotalxit mang stearat và ứng dụng trong lớp phủ epoxy để bảo vệ chống ăn mòn cho thép cacbon

Hydrotalcite containing stearate (HT-SA) was prepared using the co-precipitation method. The HT-SA obtained was characterized by Fourier transform infrared spectroscopy (FT-IR), thermal gravimetric analysis (TGA). The results showed that the stearate is present in hydrotalcite (about 26.5 %). The inhibitive efficiency of HT-SA on carbon steel was characterized by electrochemical method and the protective properties of the epoxy coating containing HT-SA were evaluated by electrochemical impedance spectroscopy (EIS). The obtained results showed that the HT-SA is an anodic inhibitor. Its efficiency was about 74 % at a concentration of 3 g/l. The presence of HT-SA (3 %) improved the barrier properties and corrosion protection of the epoxy coating

Ảnh hưởng của nano silica biến tính silan đến khả năng bảo vệ chống ăn mòn của màng sơn epoxy giàu kẽm

Zinc rich coatings are the best effective primers for corrosion protection of carbon steel in aggressive conditions. For traditional zinc rich primer the zinc content is very high, more than 90 wt.%. The coating adhesion is decreased with the increase of zinc content, so that it is necessary to decrease the zinc content by using additives. In this study the nano silica modified by N-(2-Aminoethyl)-3-aminopropyltrimethoxysilane was prepared and incoporated in zinc rich epoxy coatings containing 85 wt.% zinc powder. The corrosion protection performance of coatings was evaluated by electrochemical impedance spectroscopy. The results obtained show that the presence of nano silica improved corrosion protection of zinc rich epoxy coating and the best protection was obtained with 3 wt.% nano silica. Keywords. Silane modified nano silica, corrosion protection, electrochemical impedance spectroscopy, zinc rich coating