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https://hdl.handle.net/20.500.14094/90008356
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2024-04-26
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90008356 (fulltext)
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メタデータID
90008356
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open access
出版タイプ
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タイトル
Removal of Surface Scale from Titanium Metal by Etching with HF-HNO3 Mixed Acid
著者
Mizuhata, Minoru ; Yamamoto, Shintaro ; Maki, Hideshi
著者ID
A0922
研究者ID
1000010283871
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=bc56357c0d6f0f29520e17560c007669
著者名
Mizuhata, Minoru
水畑, 穣
ミズハタ, ミノル
所属機関名
工学研究科
著者名
Yamamoto, Shintaro
著者ID
A0923
研究者ID
1000030283873
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=0254a9fbd8d16dcd520e17560c007669
著者名
Maki, Hideshi
牧, 秀志
マキ, ヒデシ
所属機関名
環境保全推進センター
収録物名
Materials Transactions
巻(号)
58(9)
ページ
1280-1289
出版者
Japan Institute of Metals and Materials
日本金属学会
刊行日
2017-09-01
公開日
2021-06-17
抄録
Etching of commercial pure titanium (CP-Ti) covered with metal oxide scale transferred to the surface from roller mills like those used for steel refining was investigated based on potentiodynamic polarization measurements and quantitative analysis of metal dissolved in HF or HF–HNO3. CP-Ti prepared by an industrial titanium supplier, titanium plate with scale (S-Ti), and annealed and pickled titanium (AP-Ti) were examined. The titanium substrate under the scale layer immediately dissolved in HF solution of concentration 1.0 mol·L−1. The etching behavior was examined in detail by electrochemical analysis in dilute HF. At HF concentrations less than 0.1 mol·L−1, the oxidized layer of S-Ti remained. X-ray photoelectron spectroscopy was used to identify the major components of the S-Ti surface, such as copper and iron impurities. In HF–HNO3 solution, the scale was removed slowly, even at high HF concentrations. The amounts of dissolved titanium indicated that calcium on the titanium metal surface increased the etching rate, and the minimum apparent activation energies, ΔEa, of the etching reactions were observed at a concentration of 0.0316 mol·L−1 HF aq. for S-Ti and AP-Ti because of the trade-off between the HF activity and ionic dissociation. Etching of CP-Ti began with dissolution of the passive layer of titanium; corrosion of S-Ti was the result of destruction of the titanium oxide layer by F− and dissolution of the pure titanium substrate. The etching behavior of S-Ti at high HF concentrations suggested that scale peeling by substrate etching is a promising method for efficient scale removal. The HNO3 concentration had little effect on the anodic polarization curves of CP-Ti. This is attributed to the presence of a stable oxide layer on the titanium metal. We investigated the details of the S-Ti etching mechanism in HF–HNO3 for efficient scale removal.
キーワード
titanium
scale removal
apparent activation energy
potentiodynamic polarization
Tafel plot
カテゴリ
環境保全推進センター
工学研究科
学術雑誌論文
権利
© 2017 The Japan Institute of Metals and Materials
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資源タイプ
journal article
言語
English (英語)
ISSN
1345-9678
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eISSN
1347-5320
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NCID
AA1151294X
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関連情報
DOI
https://doi.org/10.2320/matertrans.M2017110
NAID
130006003756
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