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Electrodeposition of tin/cobalt/iron alloy systems from environmentally acceptable electrolytes
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Electrodeposition of tin/cobalt/iron alloy systems from environmentally acceptable electrolytes
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Dissertation
Electrodeposition of tin/cobalt/iron alloy systems from environmentally acceptable electrolytes
2004
Overview
Recent research that strives to replace conventional hard chromium with a more environmentally benign substitute has been largely based on the electrodeposition of tin-cobalt alloys from gluconate baths. These non-toxic, inexpensive plating systems have offered an alternative for most decorative applications, whilst affording environmental and economic benefits. Such coatings however do not provide comparable hardness and wear resistance for engineering applications. The development of low cost, environmentally benign processes to electrodeposit alloys based on tin, cobalt and iron has been investigated, to incorporate the hardness of iron into the system. Novel aspects of the research include the electrodeposition of iron-cobalt from the gluconate system. Fine-grained deposits with a bright metallic sheen of consistent composition have been obtained over a wide range of temperature, pH and current density. Novel electrolytic alloying systems based on environmentally acceptable electrolytes have been established for tin-iron and tin-cobalt-iron alloy coatings. A range of alloy compositions can be achieved. Conditions that produce a consistent composition over a range of operating conditions have been established. Deposits obtained from the tin-iron electrolyte system are characterised by a dense columnar microstructure with a channel-like porosity. Tin-cobalt-iron deposits are characterised by a columnar structure and surface morphology examination by SEM reveal a microcracked network. Microstructural examination by Mössbauer Spectroscopy and X-ray diffraction reveal that the tin-iron and tin-cobalt-iron deposits contain new metastable ferromagnetic amorphous phases. Tin-cobalt-iron electrodeposits obtained at low temperature, low current density and from an acidic gluconate bath have a lustre similar to decorative chromium. Preliminary electrochemical corrosion studies were performed and showed the novel electrolytic tin-iron alloy and novel tin-cobalt-iron ternary alloy to exhibit good corrosion resistance when compared to existing protective coatings.
Publisher
ProQuest Dissertations & Theses
Subject
