Surface Characteristic and Corrosion Phenomena of X-ray Irradiated Pure Mg

Funatsu, Keisuke; Suzuki, Masashi; Takahashi, Makoto; Imai, Hisashi; Umeda, Junko; Akamatsu, Fumiteru; Kondoh, Katsuyoshi

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タイトル	Surface Characteristic and Corrosion Phenomena of X-ray Irradiated Pure Mg
著者	Funatsu, Keisuke Funatsu, Keisuke
	Suzuki, Masashi Suzuki, Masashi
	Takahashi, Makoto Takahashi, Makoto
	Imai, Hisashi Imai, Hisashi
	Umeda, Junko Umeda, Junko
	Akamatsu, Fumiteru Akamatsu, Fumiteru
	Kondoh, Katsuyoshi Kondoh, Katsuyoshi
キーワード等	Magnesium
	Corrosion phenomenon
	X-ray irradiation
	Dense MgO film
抄録	Magnesium (Mg) and its alloys are highly corrodible due to their low standard electrode potential (SEP). The conventional methods to improve corrosion resistance of Mg alloys are an anodic oxide film formation processing and chemical conversion treatment. However, these processes consume high energy. Besides, Mg products treated with these methods are hard to be recycled due to their large content of impurities. In this study, a unique Mg oxide (MgO) film, formed by a radical reaction between the pure Mg surface and radical species by X-ray irradiation, was fabricated on the Mg sample surface, and its corrosion phenomenon was evaluated. Pure Mg surface was modified by X-ray irradiation under atmospheric condition. XPS analysis indicated MgO film was formed on the surface of pure Mg after X-ray irradiation. Cross-sectional observation by TEM showed the MgO film was dense compared to the naturally formed oxide films with porous structures. The thickness of its surface modification film was increased with increase in the X-ray irradiation time. After salt water immersion test, the corrosion resistance of X-ray irradiated pure Mg for 24 hours was about four times higher than that of as-polished pure Mg sample. These results suggested X-ray irradiation of the Mg surface in a humid atmosphere was remarkably effective to improve the corrosion resistance of pure Mg by formation of the dense MgO films.
公開者	大阪大学接合科学研究所
公開者の別表記	Joining and Welding Research Institute, Osaka University
公開者 (ヨミ)	オオサカダイガクセツゴウカガクケンキュウジョ
掲載誌名	Transactions of JWRI
巻	41
号	2
開始ページ	13
終了ページ	18
刊行年月	2012-12
ISSN	03874508
NCID	AA00867058
URL	http://hdl.handle.net/11094/24865
言語	英語
カテゴリ	紀要論文 Departmental Bulletin Paper
カテゴリ	Transactions of JWRI / Vol.41 No.2 (2012-12)

著者版フラグ	publisher
NII資源タイプ	紀要論文
ローカル資源タイプ	紀要論文
dcmi資源タイプ	text
DCTERMS.bibliographicCitation	Transactions of JWRI.41(2) P.13-P.18
DC.title	Surface Characteristic and Corrosion Phenomena of X-ray Irradiated Pure Mg
DC.creator	Funatsu, Keisuke
	Suzuki, Masashi
	Takahashi, Makoto
	Imai, Hisashi
	Umeda, Junko
	Akamatsu, Fumiteru
	Kondoh, Katsuyoshi
DC.publisher	大阪大学接合科学研究所
DC.language" scheme="DCTERMS.RFC1766	英語
DCTERMS.issued" scheme="DCTERMS.W3CDTF	2012-12
DC.identifier" scheme="DCTERMS.URI	http://hdl.handle.net/11094/24865
DC.subject	Magnesium
	Corrosion phenomenon
	X-ray irradiation
	Dense MgO film
DCTERMS.abstract	Magnesium (Mg) and its alloys are highly corrodible due to their low standard electrode potential (SEP). The conventional methods to improve corrosion resistance of Mg alloys are an anodic oxide film formation processing and chemical conversion treatment. However, these processes consume high energy. Besides, Mg products treated with these methods are hard to be recycled due to their large content of impurities. In this study, a unique Mg oxide (MgO) film, formed by a radical reaction between the pure Mg surface and radical species by X-ray irradiation, was fabricated on the Mg sample surface, and its corrosion phenomenon was evaluated. Pure Mg surface was modified by X-ray irradiation under atmospheric condition. XPS analysis indicated MgO film was formed on the surface of pure Mg after X-ray irradiation. Cross-sectional observation by TEM showed the MgO film was dense compared to the naturally formed oxide films with porous structures. The thickness of its surface modification film was increased with increase in the X-ray irradiation time. After salt water immersion test, the corrosion resistance of X-ray irradiated pure Mg for 24 hours was about four times higher than that of as-polished pure Mg sample. These results suggested X-ray irradiation of the Mg surface in a humid atmosphere was remarkably effective to improve the corrosion resistance of pure Mg by formation of the dense MgO films.
citation_title	Surface Characteristic and Corrosion Phenomena of X-ray Irradiated Pure Mg
citation_author	Funatsu, Keisuke
	Suzuki, Masashi
	Takahashi, Makoto
	Imai, Hisashi
	Umeda, Junko
	Akamatsu, Fumiteru
	Kondoh, Katsuyoshi
citation_publisher	大阪大学接合科学研究所
citation_language	英語
citation_date	2012-12
citation_journal_title	Transactions of JWRI
citation_volume	41
citation_issue	2
citation_firstpage	13
citation_lastpage	18
citation_issn	03874508
citation_public_url	http://hdl.handle.net/11094/24865
citation_keywords	Magnesium
	Corrosion phenomenon
	X-ray irradiation
	Dense MgO film

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