Formation of Aluminum Silicate Film on Steel in Granite-Copper-Dry steam Reaction System

Yongcheng Jin 2Inna R. Korablova 1Yoshihiko Oke 1Nakamichi Yamasaki 1

1. Graduate School of Environmental Studies, Tohoku University, Sendai, Japan
2. Graduate School of Engineering, Tohoku University, Sendai, Japan

Abstract

We have observed that a highly protective amorphous aluminum silicate layer on steel surface was formed after granite-dry steam interaction in the presence of copper plate near critical point. In this process, the mass transfer of aluminum and silicon species from the granite to the steel surface takes place after copper is transferred to the granite surface. The rate of this process is accelerated by the presence of copper on the granite surface. In previous studies, we have found that the mass transfer of copper occurred due to copper-dry steam interaction in the presence of O2. Finally, formed Cu2O was transferred through dry steam as Cu2O•nH2O
At present, we determined the effect of transferred copper species on the weight loss of granite in dry steam with different ratio O2 and N2. It was found also that transferred copper species at lower O2 level promote the weight loss of granite. Four types of experiments were conducted at low O2 ratio in different density steam: 1) steel-steam, 2) steel-Cu-steam, 3) steel-granite-steam, 4) steel-granite-Cu-steam. It was established that an aluminum silicate film formed on steel surface only at the steel-granite-Cu-dry steam interaction. The formed film was characterized by X-ray photoelectron spectroscopy(XPS), and scanning electron microscopy (SEM) equipped with an energy dispersive X-ray (EDX).

Presentation: poster at E-MRS Fall Meeting 2005, Symposium F, by Yoshihiko Oke
See On-line Journal of E-MRS Fall Meeting 2005

Submitted: 2005-06-14 06:52
Revised:   2009-06-07 00:44
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