Search

Studying the impact of the environment on metal corrosion is of considerable significance for the safety assessment of buildings and the life prediction of equipment. We developed a new regional environmental corrosion model (RECM) to predict the atmospheric corrosion of Q235 carbon steel based on measured environmental data and corrosion rates obtained from one-year-long static coupon tests. The corrosion of metals varies depending on the environment; therefore, the ability of the model to distinguish such differences is crucial for accurately predicting corrosion. Herein, the regions in which the test sites were located were divided based on the basic principles of atmospheric corrosion. Furthermore, random forest was used to assess the importance of various environmental factors in the corrosion process within each region, which established a close relationship between corrosion and environmental conditions. Our results showed that the accuracy of the RECM is higher than that of the dose-response function of the ISO9223-2012 standard. The method of model construction can be realized automatically using a computer.

A cerium-oxide film with flowerlike micro-nanostructure was prepared by hydrothermal method and modified by CVD method with fluorine-free silane (TMOS and MTMS) to obtain super-hydrophobic performance on the surface of aluminum alloy 2024-T3. The films were characterized by scanning electronic microscope (SEM), energy dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR) and electrochemical impedance spectroscopy (EIS). The effect of the reactant ratio, catalyst concentration and CVD time on the hydrophobicity were investigated in detail. The boiling water pretreatment was proved to take structural-oriented effect on growth of cerium-oxide film with flowerlike micro-nanostructure. The results revealed that the cerium-oxide film prepared by boiling water pretreatment was more suitable as a base film. Electrochemical measurements showed that the super-hydrophobic modification of cerium-oxide film significantly improved the anticorrosion property of aluminum alloy, and the stable air layer formed on the modified surface was necessary to the improvement of the corrosion resistance.