Crystal Structure of Black Chromium Deposit from Plating Bath Containing Hydrogen Silicofluoride:Studies on Colored Chromium Plating (Part 4)

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概要

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• There have been no complete researches on the crystal structure of black chromium deposit from the plating bath containing hydrogen silicofluoride. The authors studied these crystal structures by microstructures and electron diffraction pattterns for explaining relationship between physical properties and structures of the deposits.As the results, it was found that the black chromium plating layer consisted of laminated structure, in which the upper layer was peeled off from the lower one. The upper layer was a black deposit consisting of Cr2O3 which contains Cr (body-centered cubic). However, these crystallizations depended upon plating conditions; when the bath temperature and current density were higher, the crystallization was more accelerated and the growth of single crystals (Cr2O3) was also more developed. In these conditions, deposits were likely to be more easily cracked owing to the growth of other complicated chromium oxides or metastable hexagonal chromium crystals on the boundaries of these Cr2O3 single crystals.The lower layer was a grayish black thin layer, consisting of Cr2O3 of body-centered cubic lattice or hexagonal system which contains various other chromium oxides.Cr2O3 had crystal structure of hexagonal system and was cleaved along (100) plane and peeled off on (001) base plane.Hardness and abrasion resistance of the black chromium deposit depended upon composition and structure of these crystals, and the cracks of the deposit were formed along the cleavage planes of Cr2O3 single crystals.

• 社団法人 表面技術協会の論文

社団法人 表面技術協会 | 論文

• イオンプレーティング法による厚膜化の現状とピストンリングへの応用
• 自動車用エンジン部品の表面技術と環境対策
• プリント配線基板で発生するイオンマイグレーションと信頼性解析
• イオン交換体の設計と輸送現象
• 半導体膜の低温成長

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