A surface analytical examination of passive layers on CuNi alloys: Part I. Alkaline solution

The electropolymerization of pyrrole at a CuNi electrode: corrosion protection properties

“…The copper-modified CuNi electrode appears to be more active than the unmodified CuNi electrode. This is consistent with the passivating properties of the nickel alloying addition [1][2][3]. It can be seen that the polymer-coated CuNi electrode can be polarized to relatively high anodic potentials before high anodic currents are measured.…”

“…Strehblow and co-workers [2,3] have described this layer as a bilayer with a predominatly Ni-rich outer hydroxide and a Cu-rich inner oxide. It appears that the presence of this Ni-rich outer layer inhibits the electropolymerization process.…”

“…It is well known that the addition of nickel to copper, as an alloying component, to form CuNi alloys, gives rise to the production of a corrosion resistant material [1][2][3]. CuNi alloys, particularly the commercial 70Cu30Ni, exhibit good resistance to generalized and localized corrosion and consequently find applications, such as in the production of heat exchangers, in many different industries.…”

Corrosion Inhibition of Cu-Ni (90/10) Alloy in Seawater and Sulphide-Polluted Seawater Environments by 1,2,3-Benzotriazole

“…With the increase in immersion period from 1 to 48 h, the corrosion potential ( corr ) is shied towards more negative value and the shi in cathodic Tafel slope ( ) is greater than the shi in anodic slope ( ). However, the corrosion current density ( corr ) is found to decrease signi�cantly up to 12-hour immersion period and then increase slightly up to 48 h. ese results infer that with the increase in immersion period from 1 to 48 h, there is a decrease in the corrosion rate of the alloy due to the formation of copper oxide �lm, and this has been reported by many investigators [7,[36][37][38]. Another interesting feature is that while there is only one anodic peak aer 1-and 12-hour immersion periods, there are two anodic peaks aer 24-and 48-hour immersion periods at 150 and 250 mV versus Ag/AgCl electrode, respectively.…”

Improved pitting corrosion behaviour of electrodeposited nanocrystalline Ni–Cu alloys in 3.0wt.% NaCl solution

“…In the literature, enough data is available on the corrosion behaviour of copper-based Cu-Ni and Cu-Ni-Fe alloys [2][3][4][5][6][7] with the studies emphasising on the nature of passive film and its mechanism of protection against aggressive environment. However, most of the reported literature refers to corrosion behaviour of conventional polycrystalline copper-based alloys.…”