Acceleration of pitting corrosion of 70Cu–30Ni alloy in seawater by NH4+ and stress

Xing, Huaiyuan; Du, Min; Huang, Guosheng; Ma, Li

doi:10.1016/j.jmrt.2022.12.184

Cited by 7 publications

(6 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Figure 3, the Cu-30Ni experiences pitting corrosion upon exposure to seawater and seawater + NH 4 + . With the further application of stress, cracks developed on the surface [13]. Note that Figure 3 has a lower magnification than Figure 3a,b to show the full morphology of the formed crack.…”

Section: Ammonium Nhmentioning

confidence: 93%

“…Additionally, Ni may also form NiO and incorporate it into the surface oxide layer, thus helping to improve the corrosion resistance [13].…”

Section: Basic Corrosion Mechanismsmentioning

confidence: 99%

“…In the presence of Cl − , an alternative pathway is that the substrate Cu first dissolves as CuCl 2 , then is turned into Cu 2 O. The specific cathodic and anodic reactions are shown below [11][12][13].…”

Section: Basic Corrosion Mechanismsmentioning

confidence: 99%

“…Ammonium Ammonium (NH 4 + ) can enhance the corrosion of Cu-Ni alloys by destroying the surface copper oxide layer and inhibiting the following repassivation. Under the continuous attack, the Cu 2 O may be dissolved via the following reactions [13] Cu…”

Section: Sulfidementioning

confidence: 99%

“…Once the crack is initiated, it can propagate to failure unless MgCl2 is added and plays a mitigating effect. H. Y. Xing et al [13] reported the synergistic effects of stress and NH4 + on the pitting corrosion of the Cu-30Ni alloy. NH4 + destroys the oxide film on the surface of the Cu-30Ni alloy, hindering the restoration process of the oxide film, and thereby diminishing the quantity of protective Cu2O and NiO in the corrosion products of the specimen.…”

Section: Ammonium Nhmentioning

confidence: 99%

See 4 more Smart Citations

Stress Corrosion Cracking of Copper–Nickel Alloys: A Review

Li,

Gao

et al. 2023

Coatings

View full text Add to dashboard Cite

Under the combination of certain corrosive ions and stress, Cu-Ni alloys may experience severe stress corrosion cracking (SCC), which causes premature failure and hinders their further applications as crucial construction materials in various engineering fields. To reveal the origin of such failure, minimize the related negative impacts, and achieve economic and social benefits, this review summarizes all SCC-related issues by making a brief introduction to Cu-Ni alloys, reporting the SCC behavior in various environments, identifying the effects of different factors during SCC, and revealing the SCC degradation mechanisms. S2− and NH4+ are the prominent SCC initiators since the former can combine with Cu+ to form Cu2S as a non-protective corrosion product, while the latter has a great tendency to react with Cu2O/Cu and accelerate the general or local dissolution. Their combination has the most detrimental effect. The SCC mechanisms of Cu-Ni alloys are summarized as film rupture theory and dealloying theory. The related SCC mitigation strategies, including using inhibitors, tailoring alloying elements, and removing/reducing the stress are also discussed. In addition, future directions are made at the end of this paper.

show abstract

Section: Ammonium Nhmentioning

confidence: 93%

“…Additionally, Ni may also form NiO and incorporate it into the surface oxide layer, thus helping to improve the corrosion resistance [13].…”

Section: Basic Corrosion Mechanismsmentioning

confidence: 99%