Control of the Surface Charge and Improved Corrosion Resistance of Stainless Steel by the Combined Use of Gaseous Ozone and Heat (特集/エネルギーと表面技術)
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概要
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The surface charge of 316 L stainless steel particles treated at various temperatures under oxygen or gaseous ozone of 0.2 to 15% (vol/vol) was determined as a function of pH by potentiometric titration. The apparent points of zero charge (pzc’sapp) of ozone-treated stainless steel particles were situated at points corresponding to more acidic pH values compared with the pzc’sapp of oxygen-treated particles. The degree of the shift in the pzcapp of stainless steel particles depended on the ozone concentration and temperature. The combined ozone/heat treatment was found to induce the surface dehydroxylation of stainless steel particles. Cr6+ species were generated in the passive film on stainless steel particles through ozone oxidation. The generated Cr6+ species were readily dissolved into aqueous solution, whereas the amount of dissolved Cr6+ species decreased markedly by heating again at 200℃ under atmospheric pressure. It was demonstrated that the situation of pzcapp and the surface charge density of stainless steel particles could be controlled, to some extent, by the combined ozone/heat treatment followed by post-ozone heat treatment. Controlling the surface charge of stainless steel particles resulted in a lower affinity for pectin adsorption. It was also shown that the combined ozone/heat treatment resulted in the formation of relatively thick and dense passive film on stainless steel particles, thereby giving a higher resistance to surface dissolution in aqueous solution than oxygen-treated particles.
- 一般社団法人 表面技術協会の論文
- 2003-12-01
著者
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Koike K
Nanomaterials Microdevices Research Center Osaka Institute Of Technology
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HIRAMATSU Minoru
Industrial Technology Research Institute of Okayama Prefectural Government
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Koike Kunihiko
Shiga Technology Center Iwatani International Corp
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TAKAHASHI KAZUHIRO
Industrial Technology Center of Okayama Prefecture
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Fukuzaki S
Industrial Technology Center Of Okayama Prefecture
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Fukuzaki Satoshi
Industrial Technol. Center Of Okayama Prefecture Okayama
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TAKEHARA ATSUHIKO
Industrial Technology Center of Okayama Prefecture
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Takehara A
Industrial Technology Center Of Okayama Prefecture
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Takahashi K
Laboratory Of Biophysical Chemistry College Of Agriculture Osaka Prefecture University
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Hiramatsu Minoru
Industrial Technology Center Of Okayama Prefecture
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Takahashi Kazuhiro
Industrial Technological Center Of Okayama Prefecture
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Koike Kazuto
Nanomaterials Microdevices Research Center Osaka Institute Of Technology
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福崎 智司
Industrial Technology Center of Okayama Prefecture
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竹原 淳彦
Industrial Technology Center of Okayama Prefecture
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高橋 和宏
Industrial Technology Center of Okayama Prefecture
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