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Post treatment of silane and cerium salt as chromate replacers on galvanized steel

Journal of Rare Earths 2009年第1期27卷 164-168页

作者：孔纲卢锦堂吴海江 School of Materials Science and Engineering South China University of Technology

A complex film on hot-dip galvanized steel sheet（HDG） was prepared by immersing the sheet in 0.1wt.% Ce（NO3）3 solution and 5vol.% silane solution in *** corrosion protection of the complex film was evaluated by potentiodynamic linear polarization（LPR）, electrochemical impendence spectra（EIS） and natural salt spray（NSS） tests and compared with that of single cerium film and silane *** results showed that, the presence of these films on the zinc coating hindered corrosion reaction by reducing the rate of both anodic and cathodic reaction in the corrosion process, and the corrosion protection of the complex film was much better than that of single cerium film or silane film and closed to that of chromate film, because the polarization resistance Rp and electrochemical impendence were increased *** and chemical composition of these pretreated films were also investigated by scanning electron microscopy（SEM） and AES.

关键词： cerium salt silane Galvanized steel passivation rare earths

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Anodising of 2024-T3 aluminium alloy in electrolyte of sulphuric-boric-phosphoric mixed acid containing cerium salt as corrosion inhibitor

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Transactions of Nonferrous Metals Society of China 2017年第3期27卷 711-721页

作者： MohsenSAEEDIKHANI MehdiJAVIDI SarehVAFAKHAH Department of Materials Science and Engineering School of EngineeringShiraz UniversityZand StreetShiraz ***Iran

The effect of cerium salt as an inhibitor in anodising of the2024-T3aluminium alloy was *** electronmicroscopy equipped with energy dispersive X-ray spectroscopy was used to study the surface composition of the alloy before andafter surface preparation.A mixed electrolyte of10%sulphuric acid,5%boric acid and2%phosphoric acid containing0.1mol/Lcerium sulphate salt was used as the anodising *** treatment was also done in boiling water and molten stearic *** impedance spectroscopy and salt spray techniques were performed in order to investigate the corrosion behaviourand durability of the oxide films,*** was concluded that the presence of cerium ions in anodising electrolyte resulted inthe increase in homogeneity,the rate of oxide film growth and also the thickness of the oxide layer,owing to the high oxidisingpower of cerium ion.

关键词： aluminium alloy anodising mixed acid cerium salt inhibitor

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