Replacement of Chromium Electroplating on Landing Gear Components Using HVOF Thermal Spray Coatings

Abstract

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A comparative study on the microstructure and surface property evaluation of coatings produced from nanostructured and conventional WC–Co powders HVOF-sprayed on Al7075

“…An integrated approach is adopted that includes the response to corrosion (potentiodynamic, potentiostatic polarization) and sliding wear, as well as an insight into the mechanisms involved. The motivation behind this work lies upon the following facts: (a) the limited research works on the wear and, especially, corrosion behaviour of nanostructured hard metal coatings on light metal alloys; (b) the need to improve the tribological and corrosion behaviour of light metal alloys; (c) the need to expand the use of aluminium alloys to engine design for reducing fuel consumption and other corrosion/wear resistant applications (e.g., cylinder liners [56], cylinder heads [57], cylinder bore walls [58], turbojet engine blade roots and edges [59], aircraft flap tracks [60], fan and compressor blade mid-span dampers [61], plastic injection moulds [50]); and(d) the necessity to replace electrolytic hard chromium plating (due to carcinogenic Cr(VI) emissions) with environmentally friendlier techniques, such as HVOF.…”

Influence of mechanical properties of tungsten carbide–cobalt thermal spray coatings on their solid particle erosion behaviour

“…1 Among the results of such research activities, it has been shown that WC-Co base coatings deposited by high velocity oxygen fuel (HVOF) are good candidates for such a purpose, particularly for the successful replacement of EHC in aeronautical and aerospace applications. [2][3][4][5][6][7][8] HVOF WC-Co base cermets can withstand high contact pressures without spallation and are often used in applications where abrasive wear and erosion resistance are of a primary concern, whereas WC-Co-Cr base coatings are preferred when a higher corrosion resistance is required.…”

Influence of WC–20Co–1Ni coating by HVOF on lifespan of the downhole drilling motors

“…Moreover, the results of literature studies showed that this type of coatings had good wear and corrosion resistant properties [12-14]. Low porosity (1%), low oxidation (1%) and a significantly lower harmful effect on the ecosystem [15,16] are the reasons for using WC–20Co–1Ni HVOF-sprayed coating for hard chromium replacement. In this study, the feasibility of replacing the WC–20Co–1Ni coating by HVOF using the hard chromium coating plating on the rotor and its consequences on the lifespan and performance of the downhole drilling motor was examined.…”