著者

野口 駿雄

出版者

近畿大学理工学部応用化学科応用制御化学研究室

雑誌

近畿アルミニウム表面処理研究会会誌 = Aluminum finishing society of Kinki (ISSN:02856689)

巻号頁・発行日

no.290, pp.16-16, 2014-11-01

著者

野口 駿雄

出版者

近畿大学理工学部応用化学科応用制御化学研究室

雑誌

近畿アルミニウム表面処理研究会会誌 = Aluminum finishing society of Kinki (ISSN:02856689)

巻号頁・発行日

no.291, pp.13-14, 2015-01-01

著者

野口 駿雄 吉村 長蔵

出版者

一般社団法人 表面技術協会

雑誌

表面技術 (ISSN:09151869)

巻号頁・発行日

vol.40, no.4, pp.584-589, 1989-04-01 (Released:2009-10-30)

参考文献数

4

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Specimens were electrolyzed by AC with various current waveform (sine wave, square wave and saw-tooth wave) and frequencies (10∼kHz) in NH4OH-NH4F system bath and NaOH-H2O2 system bath at a current density of 2A/dm2 for 30min, at 20°C.The use of a 10Hz square waveform resulted in a formation of a thicker film (5∼6μm) in both the NH4OH-NH4F and NaOH-H2O2 system baths. In the former case (NH4OH-NH4F system bath), film thickness decreased at frequencies above about 200Hz, reaching about 1∼2μm at frequencies above 1kHz. In the latter case (NaOH-H2O2 system bath), film thickness decreased according to increase of frequency, and it was about 0.5∼1μm in thickness at high frequency more than about 500Hz.The films anodized in the NaOH-H2O2 system bath with square current waveform was much rougher than those fromed using with sine or saw-tooth waveforms and larger pores were observed by microscope.Many large pores were observed in the coatings formed at high frequency and those formed in NaOH-H2O2 system bath had larger pores than those fromed in NH4OH-NH4F system bath.