Behavior of 316 Stainless Steel and Al2O3-SiO2 Ceramics in Ozone Environment

ITOH Noriko, FILMANOVICH Vladimir, KOSHIBA Masahiro, KURIBAYASHI Kiyoshi

doi:10.1246/nikkashi.1997.283

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Other Title

オゾン雰囲気中のステンレス鋼316およびAl2O3-SiO2系セラミックスの挙動
オゾン雰囲気中のステンレス鋼316およびAl2O3-SiO2系セラミックスの挙動
オゾンフンイキチュウノステンレスコウ 316 オヨビ Al2O3-Si
Behavior of 316 Stainless Steel and Al2O3-SiO2 Ceramics in Ozone Environment.

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The processes of degradation of stainless steel SUS316 and Al-Si-ceramics contacted with ozone were investigated in the aqueous solution (about 20 ppm 03) and in the humid gas environment (about 4.5 vol% 03). The experiments were carried out at room temperature. The changes of surface of these samples were evaluated by SEM, EDX and Auger electron spectroscopy. The ICP technique was used to measure kinetics of ion elution from solid samples into aqueous solution containing ozone. For the stainless steel, it was determined that in ozone gas atmosphere the corrosion film (Fe0OH, CrO, Cr, M oSi2) was produced and it was easily destroyed by 03, and while in the aqueous solution of ozone the weight loss was 0.014% aftenten days sintering. The amounts of the individual Fe, Cr and Ni-ion eluted f rom the steel were also measured. For two kind of Al-Si-ceramics, the corrosion rates in ozone gas environment were negligible slow. But, in the aqueous solution of ozone, amounts of dissolved Al and Si-ions were increased gradually during 35 days. The weight loss of sample Si28 (28 wt% Si02) and sample Si60 (60 wt% Si02) were 0.096% and 0.02%, respectively. It was assumed that the dissolved chemical species were aluminate and silicate ions such as A102-, A1033-, SiO32-, SiO44-

Journal

NIPPON KAGAKU KAISHI

NIPPON KAGAKU KAISHI 1997 (4), 283-289, 1997-04-10

The Chemical Society of Japan

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Behavior of 316 Stainless Steel and Al<SUB>2</SUB>O<SUB>3</SUB>-SiO<SUB>2</SUB> Ceramics in Ozone Environment