En-Hou Han

Preparation of Montmorillonite by Two-step Intercalation and Its Effect on the Corrosion Resistance of Epoxy Coatings

Two- step intercalation montmorillonites were prepared with montmorillonites(MMTs) as raw material and firstly octadecylamine was used as an modifier to prepare organic MMTs and then 8-hydroxyquinoline as the inhibitor to treat organic MMTs. The MMTs were characterized by infrared spectra and X-ray diffraction. The results show that octadecylamine and 8-hydroxyquinoline have intercalated into the layer of MMTs, and the spacing of MMTs respectively enlarged from 1.17 nm to 1.57 nm and1.82 nm. The resultant MMTs enhanced significantly the corrosion resistance of the epoxy coating according to EIS results.

Influence of Corrosion Inhibitor Carriered Nano-SiO2 on Corrosion Resistance of Epoxy Coating

The 8-hydroxyquinoline (8Q), as a sustained-release corrosion inhibitor was deposited onto nano-particles of mesoporous-silica to prepare 8-hydroxyquinoline-silica (8Q-SiO2) powder. Then the powder was used as pigment to modify epoxy resin to prepare 8Q-SiO2-epoxy resin coat- ing. The prepared 8Q-SiO2was characterized by means of infrared spectrum and ultraviolet absorp- tion spectrum. The corrosion performance of the 8Q-SiO2-epoxy resin coating was examined by salt spray test and electrochemical impedance measurement. The results revealed that the 8Q can enhance the corrosion resistance of epoxy coating, and among others the epoxy coating with 5% (mass fraction) 8Q-SiO2 exhibits the highest corrosion resistance, which may be ascribed to that the 8Q may slowly release from the mesoscopic channels within SiO2 into the epoxy coating and then arrive at the interface coating/substrate to provide corrosion inhibition for the substrate.

Protective Performanmce of Nanocomposite Coating for Engineering Steel Components of Electric Power Facilities in Simulated Acid Rain Environment

A nanocomposite coating was prepared with epoxy resin as film-forming agent,polysiloxane as coupling agent and with proper additives of pigments, fillers and nano silicon dioxide.The nanocomposite coating was applied on carbon steel Q235, and its corrosion performance, in comparison with a present used coating, was investigated by means of simulate acid rain test, immersion test and electrochemical impedance spectroscopy. Results showed corrosion resistance of the nanocomposite coating is better than that of the current coating, it is suitable especially for the protection of engineering steel components for electric power facilities.

Effect of Inhibitor-grafted Montmorillonite on Corrosion Resistance of Epoxy Coatings

Nanocomposite epoxy coatings were prepared with different proportion of epoxy resin and inhibitor- grafted montmorillonite. The effect of the inhibitor- grafted montmorillonite on the corrosion resistance of epoxy coating on hot dip galvanized steel sheet was investigated by using salt spray tests and electrochemical impedance spectroscopy(EIS). The results show that among the coatings tested, the one with 3% of the inhibitor-grafted MMT exhibits the most superior corrosion resistance with water diffusion coefficient of 9.89×10-11cm2/s and porosity of 2.22×10-8respectively; while its impedance values is above 109Ω·cm2during the whole immersion times.

Influence of Nano-Cr2O3 on Corrosion Resistance of Epoxy Coatings

利用燃烧法制备粒径为10-20 nm的球状纳米Cr2O3。将纳米Cr2O3粉体添加到环氧涂层中,根据电化学阻抗谱和盐雾试验研究Nano-Cr2O3对环氧涂层耐蚀性的影响。结果表明,Nano-Cr2O3可显著提高环氧涂层耐蚀性。Nano-Cr2O3主要在涂层中提高涂层耐蚀性起到两方面作用:一是减少了孔隙率,增加了涂层的物理屏蔽作用;二是Cr3+离子直接与溶液中腐蚀热镀锌所产生的Zn2+、OH-离子反应,生成了不溶性的Zn Cr2O4隔离层。