Morphology and Boron Content of Anodic Aluminum Oxide Films Formed in Boric/Sulfuric Acid Baths
The boric/sulfuric acid anodizing process has been developed in the U. S. as a replacement for chromic acid anodizing to meet stricter environmental regulations. A comparative study has been conducted on the microstructures of boric/sulfuric acid films and sulfuric acid films. The sulfur and boron c...
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| Published in | Hyōmen gijutsu Vol. 45; no. 11; pp. 1152 - 1157 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English Japanese |
| Published |
Tokyo
The Surface Finishing Society of Japan
01.01.1994
Hyomen Gijutsu Kyokai Japan Science and Technology Agency |
| Subjects | |
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| Abstract | The boric/sulfuric acid anodizing process has been developed in the U. S. as a replacement for chromic acid anodizing to meet stricter environmental regulations. A comparative study has been conducted on the microstructures of boric/sulfuric acid films and sulfuric acid films. The sulfur and boron contents of the oxide films were determined by prompt gamma ray analysis. The type of V-t and I-t curves, and the morphology of pores were not appreciably influenced by the presence of boric acid in the anodizing bath, but the rate of formation of the boric/sulfuric acid films increased slightly and the rate of their disolution in phosphoric acid solution decreased slightly. The concentration of boric acid did not influence the amount of surfur incorporated into the oxide films. After the pores were sealed, surfur content decreased significantly due to the dissolution of sulfur compounds to the sealing solution. The boron content of porous type films was negligible, in the order of ppm. This is in remarkable contrast to the barrier type films formed in borate solutions, where boron contents of the order of several per cent have been reported. The boron content increased with increasing concentration of boric acid in the electrolytes. |
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| AbstractList | The boric/sulfuric acid anodizing process of 99.99% aluminum has been developed in the U.S. as a replacement for chromc acid anodizing to meet stricter environmental regulations. A comparative study has been conducted on the microstructures of boric/sulfuric acid films and sulfuric acid films. The sulfur and boron contents of the oxide films were determined by prompt gamma ray analysis. The type of V-t and I-t curves and the morphology of pores were not appreciably influenced by the presence of boric acid in the anodizing bath, but the rate of formation of the boric /sulfuric acid films increased slightly with the rate of their disolution in phosphoric acid solution decreasing slightly. The concentration of boric acid did not influence the amount of sulfur incorporated into the oxide films. After the pores were sealed, sulfur content decreased significantly due to the dissolution of sulfur compounds to the sealing solution. The boron content of porous type films was negligible in the order of ppm. This is in remarkable contrast to the barrier type films formed in borate solutions, where boron contents of the order of several percent have been reported. The boron content increased with increasing concentration of boric acid in the electrolytes. The boric/sulfuric acid anodizing process has been developed in the U. S. as a replacement for chromic acid anodizing to meet stricter environmental regulations. A comparative study has been conducted on the microstructures of boric/sulfuric acid films and sulfuric acid films. The sulfur and boron contents of the oxide films were determined by prompt gamma ray analysis. The type of V-t and I-t curves, and the morphology of pores were not appreciably influenced by the presence of boric acid in the anodizing bath, but the rate of formation of the boric/sulfuric acid films increased slightly and the rate of their disolution in phosphoric acid solution decreased slightly. The concentration of boric acid did not influence the amount of surfur incorporated into the oxide films. After the pores were sealed, surfur content decreased significantly due to the dissolution of sulfur compounds to the sealing solution. The boron content of porous type films was negligible, in the order of ppm. This is in remarkable contrast to the barrier type films formed in borate solutions, where boron contents of the order of several per cent have been reported. The boron content increased with increasing concentration of boric acid in the electrolytes. |
| Author | NAGASE, Hirokazu MORISAKI, Shigeyoshi |
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| References | 5) 森崎重喜; アルミニウム表面処理技術部会 (表面技術協会) 第20回サマーセミナーテキスト, p. 49 (1993 8) 福田芳雄; 日本化学会誌, 95, 1886 (1974 12) S. Matuzawa, N. Baba and S. Tajima; Electrochim. Acta, 24, 1199 (1979 14) H. Konno, S. Kobayasi, K. Fujimoto, H. Takahashi and M. Nagayama; Proc. of Interfinish 80, Kyoto, p. 281 (1980 23) 森崎重喜, 小川吉寛, 長瀬裕和; 表面技術, 45, 655 (1994 17) 米沢仲四郎, 星三千男; 日本原子力研究所JAERI-Mレポート, 91-087, p. 1 (1991 24) 星野重夫; 表面技術協会第89回講演大会要旨集, p. 120 (1994 13) H. Konno, S. Kobayasi, H. Takahasi and M. Nagayama; Electrochim. Acta, 25, 1667 (1980 18) C. Yonezawa, M. hosi, Y. Ito and E. Tachikawa; Proc. 3rd Asian Symp. on Research Reactor, Hitachi, p. 583 (1991 19) 米沢仲四郎; ぶんせき, 4, 289 (1993 22) 和田健二, 牧島亮男, 馬場宣良, 山田翆; 金属表面技術協会第75回講演大会要旨集, p. 106 (1987 2) R. Koop and Y. Moji; 28th Annual Aerospace Airline Plating and Metal Finishing Forum and Exposition, SAE Technical Paper Series, No. 920944, April 20-23 (1992 11) W. J. Bernard and J. J. Randall Jr.; J. Electrochem. Soc., 108, 822 (1961 9) 高橋英明, 永山政一; 日本化学会誌, 95, 453 (1974 21) 米沢仲四郎, A. K. H. Wood, 星三千男, 伊藤泰男; 第36放射化学討論会講演予稿集, p. 194 (1992 6) S. Morisaki and H. Nagase; 44th ISE Meeting, Berlin, September 5-10, 327 (1993 4) 森崎重喜, 長瀬裕和; 表面技術協会第88回講演大会要旨集, p. 37 (1993 1) T. Leland and Y. Moji; 26th Annual Aerospace Airline Plating and Metal Finishing Forum and Exposition, SAE Technical Paper Series, No. 900953, April 23-26 (1990 10) Y. Fukuda and T. Fukusima; Bull. Chem. Soc. Jpn., 53, 3125 (1980 3) 高田幸路; アルミニウム研究会誌, No. 263, 1 (1992 16) K. Shimizu, K. Kobayashi, G. E. Tompson and G. C. Wood; Philosophical Magazine, A66, p. 63 (1992 15) G. E. Tompson; Proc. of Interfinish 80, Kyoto, p. 1 (1980 20) C. Yonezawa; Anal. Science, 9, 185 (1993 7) 森崎重喜, 長瀬裕和; 表面技術協会第89回講演大会要旨集 p. 76 (1994 |
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| Snippet | The boric/sulfuric acid anodizing process has been developed in the U. S. as a replacement for chromic acid anodizing to meet stricter environmental... The boric/sulfuric acid anodizing process of 99.99% aluminum has been developed in the U.S. as a replacement for chromc acid anodizing to meet stricter... |
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| Title | Morphology and Boron Content of Anodic Aluminum Oxide Films Formed in Boric/Sulfuric Acid Baths |
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