Corrosion and dealloying of cast lead-free copper alloy–graphite composites

Influence of composition on corrosion behavior of as-cast Cu–Zr alloys in HCl solution

“…Dealloying is a corrosion process whereby one or several electronegative constituents of an alloy are preferentially removed from the alloy due to their high reactivity, leading to an altered residual structure [1][2][3][4][5][6][7][8]. Today, it is widely recognized that dealloying phenomena play an important role in many alloys, for example, in the corrosion of brass [9], stainless steel [10,11], the aluminum alloy 2024 [12], and the high-Pd dental alloys [13].…”

Metal–Matrix Composites

“…This finding could be expected since oxygen reduction kinetics is normally diffusion limited in aerated solutions, but hydrogen evolution kinetics depend on the substrate and could be different on the graphite fibers as compared to on the graphite particles in deaerated solutions. The corrosion potentials of C90300 copper alloy (with 1 wt % titanium additive to increase graphite wettability) MMCs reinforced with 1-10 vol % graphite particles also increased with increasing graphite content in an aqueous solution containing ferric chloride, copper sulfate, and hydrochloric acid [12].…”

“…For thermal management applications, copper MMCs are reinforced with milled graphite fibers that have negative CTEs and thermal conductivities exceeding that of copper [10]. DR copper MMCs have also been developed for sliding electrical contact materials [11] and improved machinability for lead-free copper alloys [12]. DR Al/Gr MMCs have been developed for potential use in tribological applications due to good resistance to wear and seizure [13][14][15].…”

Corrosion behaviour of carbon fibres/magnesium metal matrix composite and electrochemical response of its constituents

“…Galvanic corrosion, in general, of MMCs based on matrices such as Al, Ti and Cu reinforced with carbon or graphite was cited as a major problem [9][10][11][12][13][14][15][16]. This is due to the high electrical conductivity of carbon.…”