Characterization and microhardness of Co-W coatings electrodeposited at different pH using gluconate bath: A comparative study

被引：19

作者：

Bera, Parthasarathi ^{[1
]}

Seenivasan, H. ^{[1
]}

Rajam, K. S. ^{[1
]}

Shivakumara, C. ^{[2
]}

Parida, Sanjit Kumar ^{[2
]}

机构：

[1] CSIR Natl Aerosp Labs, Surface Engn Div, Bangalore 560017, Karnataka, India

[2] Indian Inst Sci, Solid State & Struct Chem Unit, Bangalore 560012, Karnataka, India

来源：

SURFACE AND INTERFACE ANALYSIS | 2013年 / 45卷 / 06期

关键词：

Co-W coating; gluconate bath; pH variation; XPS; COBALT-TUNGSTEN ALLOYS; THIN-FILMS; NI-W; PHOTOELECTRON-SPECTROSCOPY; PULSE ELECTRODEPOSITION; CITRATE ELECTROLYTES; AMORPHOUS-ALLOYS; MICROSTRUCTURE; DEPOSITION; CHROMIUM;

D O I：

10.1002/sia.5209

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Electrodeposition of Co-W alloy coatings has been carried out with DC and PC using gluconate bath at different pH. These coatings are characterized for their structure, morphology and chemical composition by X-ray diffraction, field emission scanning electron microscopy, differential scanning calorimetry and X-ray photoelectron spectroscopy (XPS). Alloy coatings plated at pH8 are crystalline, whereas coatings electrodeposited at pH5 are nanocrystalline in nature. XPS studies have demonstrated that as-deposited alloy plated at pH8 with DC contain only Co2+ and W6+ species, whereas that alloy plated at pH5 has significant amount of Co-0 and W-0 along with Co2+ and W6+ species. Again, Co2+ and W6+ are main species in all as-deposited PC plated alloys in both pH. Co-0 concentration increases upon successive sputtering of all alloy coatings. In contrast, mainly W6+ species is detected in the following layers of all alloys plated with PC. Alloys plated at pH5 show higher microhardness compared to their pH8 counterparts. Copyright (C) 2013 John Wiley & Sons, Ltd.

引用

页码：1026 / 1036

页数：11

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