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1. (WO2009130450) SURFACE COATINGS

Pub. No.:    WO/2009/130450    International Application No.:    PCT/GB2009/001015
Publication Date: Oct 29, 2009 International Filing Date: Apr 23, 2009
IPC: C25D 3/56
C25D 3/12
C25D 3/20
C25D 3/54
Applicants: The University of Nottingham
WESTON, David Peter
SHIPWAY, Philip Howard
HARRIS, Samuel James
YELLOP, John
Inventors: WESTON, David Peter
SHIPWAY, Philip Howard
HARRIS, Samuel James
YELLOP, John
Title: SURFACE COATINGS
Abstract:
It is necessary to provide high durability coatings for use with regard to components in industrial applications. Traditionally, hard chrome coatings have been used but these require the use of hexavalent chromium which is considered environmentally dangerous. In order to achieve coatings which approach the hardness and wear characteristics of hard chromium an iron group metal-tungsten alloy is provided. Through a method including use of a complexing agent such as gluconate the iron group metal ion as well as tungstate is kept in suspension such that through application of an appropriate electrical current density within a bath regulated to a desired pH and kept within a desired temperature range a coating is applied which has and retains a crystalline structure with enhanced as-deposited hardness values over previous amorphous iron group metal-tungsten alloy deposition electroplating.