Metal Matrix Composite Coatings of Cupronickel Embedded with Nanoplatelets for Improved Corrosion Resistant Properties

Abstract

The deterioration of metals under the influence of corrosion is a costly problem faced by many industries. Therefore, particlereinforced composite coatings are being developed in different technological fields with high demands for corrosion resistance. This work studies the effects of nanoplatelet reinforcement on the durability, corrosion resistance, and mechanical properties of copper-nickel coatings. A 90 : 10 Cu-Ni alloy was coelectrodeposited with nanoplatelets of montmorillonite (Mt) embedded into the metallic matrix from electrolytic baths containing 0.05, 0.10, and 0.15% Mt. X-ray diffraction of the coatings indicated no disruption of the crystal structure with addition of the nanoplatelets into the alloy. The mechanical properties of the coatings improved with a 17% increase in hardness and an 85% increase in shear adhesion strength with nanoplatelet incorporation. The measured polarization resistance increased from 11.77 kΩ⋅cm 2 for pure Cu-Ni to 33.28 kΩ⋅cm 2 for the Cu-Ni-0.15% Mt coating after soaking in a simulated seawater environment for 30 days. The incorporation of montmorillonite also stabilized the corrosion potential during the immersion study and increased resistance to corrosion.

Nanocomposite Coatings in Corrosion Protection Applications: An Overview

“…Biljana Bobic and his team 41 investigated the corrosion behavior of aluminium MMCs reinforced with boron, SiC, Al 2 O 3 , graphite fibers or particles and mica particles. The incorporation of boron on aluminum was fabricated by diffusing the boron microfilaments with the aluminum foils.…”

“…Metal matrix composite coatings of cupronickel embedded with nanoplatelets were employed to improve the corrosion resistance of stainless steel in sea water 41 . In this study, exfoliated montmorillonite (Mt) nanoplatelets were incorporated into Cu-Ni alloy on stainless by electrodeposition improved corrosion resistance as well mechanical properties.…”

Effects of Mo Concentration on the Structural and Corrosion Properties of Cu–Alloy

“…Metals 2019, 9,1307 6 of 11 the influence of the mass transfer that occurred after the diffusion of O2 through the layer that was formed from the corrosion products. According to the literature, for the composition of film that is formed in copper or copper alloys subjected to electrochemical tests with a water electrolyte or saline solutions, Kruger discovered that a Cu2O film is formed when copper is exposed to water in an equilibrium state with an atmosphere containing oxygen, or mixtures of oxygen and helium containing 1%, 10%, or 20% oxygen.…”

“…Metals 2019, 9,1307 8 of 11 concentration of copper than according to reaction (5), are the pit edges; in Figure 7b, the EDS of the area is presented, as well as quantification of the elements. On the other hand, Figures 8-10 show that the impedance spectra of the Cu-20 wt% Mo specimen are plotted against the time of exposure to the electrolyte at room temperature, atmospheric pressure, and in static conditions.…”

“…On the other hand, molybdenum has been used as reinforcement, for example, in stainless steels to inhibit chloride pitting, Zn coatings electrodeposited on steel [6], and Zr nucleus of nuclear reactors [7]. Some authors have conducted studies about copper matrix compounds and their behavior against corrosion [8][9][10]. Copper-base alloys have been widely used in the maritime area, such as in condenser tubes, immersion equipment, and underwater robots [11][12][13].…”