2 0 0 0 OA めっき亜鉛の結晶構造と表面形態に及ぼす光沢剤の影響
- 著者
- 津留 豊 小林 佳弘 伊東 真吾 大和 秀一郎 矢野 正明
- 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.61, no.8, pp.602-602, 2010-08-01 (Released:2011-02-26)
- 参考文献数
- 14
For zinc electroplated from a bath consisting of zinc chloride and ammonium chloride, we investigated the influence of some commercial brighteners on crystal growth and surface morphology. The bath was developed for formation of chrome (III) hydroxide type chemical conversion coatings, which contribute high corrosion resistance to zinc films. With increasing concentration of brighteners and cathode current density, the overpotential increased and the zinc deposits changed from a gray to a brighter appearance. Over the critical concentration of brighteners, zinc deposits invariably showed the preferred orientation of 10·1 plane and 10·0 plane in accordance with Pangarov's view. Especially, the latter plane might be a twin crystal formed along the twin boundary of the 10·2 plane on 00·1 plane of electroplated zinc. Increased concentration of the brighteners did not change the preferred orientation greatly, but it did reduce the grain size of zinc deposits.
- 著者
- 津留 豊 玉江 裕二 永井 陽子 中畑 友見 松居 克
- 出版者
- 公益社団法人 日本材料学会
- 雑誌
- 材料 (ISSN:05145163)
- 巻号頁・発行日
- vol.51, no.11, pp.1197-1202, 2002-11-15 (Released:2009-06-03)
- 参考文献数
- 20
- 被引用文献数
- 1 1
The galvanic cell current between a steel plate and a platinum wire cathode immersed in oxygenated lime water containing sodium chloride and various amino acids as inhibitors was measured, permitting continuous monitoring and evaluation of corrosive effects of the solution pH and of the efficacy of the corrosion inhibitors.A relation of log[Cl-]=0.41log[OH-]-0.17 was found in a criterion concentration between Cl- and OH- for the onset of pitting corrosion on the steel surface. It was also found that the amino acids functioned as corrosion inhibitors. Especially, the composite additive consisting of DL-glycine and DL-aspartic acid, or of DL-serin and DL-aspartic acid effectively adsorbed on the steel surface and greatly suppressed the pitting corrosion of the steel.