Lower Icorr Research Articles

Effects of pH value and temperature on the corrosion behavior of a Ta2N nanoceramic coating in simulated polymer electrolyte membrane fuel cell environment

To improve the corrosion resistance and electrical conductivity of Ti-6Al-4V bipolar plates used in polymer electrolyte membrane fuel cells (PEMFCs), a novel electro-conductive Ta2N nanoceramic coating was developed by reactive sputter-deposition using a double cathode glow discharge plasma technique. The microstructure of the coating consisted of fine equiaxed Ta2N grains with an average grain size of ∼13nm, which exhibited a strong (101) preferred orientation. To explore the influence of both pH values and temperatures on the corrosion resistance of the coating, the electrochemical behaviors and electronic properties of passive films grown on the Ta2N coating were systematically investigated using different electrochemical techniques in simulated PEMFC operating environment. It was shown that either increasing the acidity or the temperatures of the solution, the corrosion potential (Ecorr) decreased and the corrosion current density (icorr) increased. At a given temperature or pH value, the Ta2N coating had a higher Ecorr and lower icorr as compared with uncoated Ti-6Al-4V. The results of EIS measurements showed that with increasing temperature or acidity of the solution, the resistance of the passive film (Rp) formed on the Ta2N coating decreased slightly, being of the order of magnitude of 107Ωcm2, which was an order of magnitude higher than that of uncoated Ti-6Al-4V. The interfacial contact resistance (ICR) values were found to increase with increasing pH value or decreasing solution temperature, and the ICR values of the Ta2N coating were markedly lower than that of uncoated Ti-6Al-4V, due to the thinner thickness of passive films. Furthermore, the Ta2N-coated Ti-6Al-4V is more hydrophobic than bare Ti-6A1-4V, which was favorable for both the simplification of water management and improving corrosion resistance in PEMFC operating environment.

Corrosion Behavior of Cr Micro-alloyed Corrosion-resistant Rebar in Neutral Cl−-containing Environment

A new low-cost corrosion-resistant rebar (HRB400R) was designed and fabricated by Cr micro-alloying. The HRB400R rebar had uniform distribution of Cr element in ferrite grains. The corrosion behavior of the rebar in the neutral Cl−-containing environment was studied systematically, and the improved corrosion resistance of the HRB400R rebar was revealed. According to the corrosion-morphology observation and electrochemical monitoring during the constant immersion corrosion in the 3.5 mass% NaCl solution, the HRB400R rebar presented alleviated corrosion damage, nobler Ecorr, lower Icorr, and larger Rt values, and these phenomena were more remarkable in the initial corrosion period. The elevated electrode potential of the rebar, caused by the solid-solution of Cr micro-alloying in the ferrite grains, was the key to the corrosion-resistance improvement. The HRB400R rebar also presented much lower mass-loss rate in the salt spray corrosion test. Besides the elevated corrosion resistance of the matrix, the doping and enrichment of Cr element in the rust layer was another factor for the higher corrosion resistance, which retarded the penetration of aggressive medium through the rust layer.

Corrosion property of vitamin D loaded nanotubes for bio-implants application in an in vitro environment

Event Abstract Back to Event Corrosion property of vitamin D loaded nanotubes for bio-implants application in an in vitro environment Sweetu Patel1, Cortino Sukotjo2, Christos Takoudis3, Mathew Mathew4, Farid Amirouche5, Craig Friedrich1 and Tolou Shokuhfar1, 3 1 Michigan Technological University, Mechanical Engineering, United States 2 University of Illinois at Chicago, Restorative Dentistry, United States 3 University of Illinois at Chicago, Bioengineering, United States 4 Rush University Medical Center, Orthopaedics, United States 5 University of Illinois at Chicago, Orthopaedics, United States Introduction: In this study, Ti6Al4V surface has been functionalized with TiO2 nanotubes (TNTs), which has a biomimetic topography that resembles the porous bone morphology structure. Additionally, these TNTs are loaded with Vitamin D, which plays an essential role in homeostasis of the bone remodeling[1]. Previously, various beneficial factors of TNTs have been studied; however, the corrosion property of drug loaded TNTs has yet to be investigated[2]. Therefore, the main objectives of this study is to investigate the corrosion properties of the vitamin D loaded TNTs by performing open circuit potential (OCP), electrochemical impedance spectroscope (EIS) and potentiodynamic (PD) testing in phosphate buffer saline (PBS) and bovine calf serum (BCS) solutions. Methods: Ti6Al4V discs were divided into three groups: non-anodized (NA), anodized (A), and vitamin D loaded anodized surfaces (AD). A and AD surfaces were anodized in 0.2-wt% NH4F, 4-vol% H2O, in EG with a constant voltage of 60V for 2 hours. For AD surfaces, 5000 IU of Vitamin D (within recommended dosage by NIH) was loaded inside TNTs using pipetting and centrifuging technique[3]. Finally, corrosion property of each surface was investigated by performing OCP, EIS and PD testing. Results: Figure 1 shows the OCP graphs of NA, A, and AD samples in PBS and BCS. It is observed that the OCP of A and AD samples are significantly high (p<0.05) compared to NA. This suggests that TNTs decorated surface has higher tendency to resist corrosion than non-treated Ti6Al4V surfaces. Figure 2 shows the PD curves for all the samples, which provides information regarding the corrosion current density (Icorr) and passivation current (Ipass). It shows that lower Icorr and Ipass were obtained for A and AD in PBS compared to NA, indicating its ability to resist corrosion. Figure 3 shows the quantitative data of polarization resistance (Rp) and capacitance (C) of the surface. It is observed that significantly high Rp and low C were observed for A and AD surfaces in PBS or BCS solution, which indicates that A and AD surfaces can resist current flow due to electrochemical reaction and it also has less electrochemically active sites for charge transfer that can facilitate corrosion. Discussion: Results from this study show that Vitamin D loaded nanotubes have similar corrosion properties as non-loaded TNTs. Comprehensive analysis from OCP, PD and EIS data suggests that at either at resting or dynamic conditions, anodized surface have a lower tendency to corrode at bone-implant interface due to its thick oxide layer and the ability of the surface to interact with ions in the surrounding environment, thereby forming insulating dielectric film. Additionally, the electrostatic interaction between the negatively charged TNTs and the proteins from the extracellular fluid forms a protective layer on the anodized surface, which explains the high resistance and low capacitance value[4]. Significance: The study highlights two key points in the development of smart TNTs surfaces. First we have shown that a biomimetic surface is possible and second we have demonstrated how these clusters of nanotubes can act as a reservoir for potential drug storage and drug delivery without risking any surface corrosion resistance property loss. This work made use of instrument in the Electron Microscopy Service (Research Resource Center, UIC). Financial support was provided by the Mechanical Engineering Department at MTU. We are grateful to National Science Foundation, DMR Grant # 1350734, NSF award 1359734 and CBET Grant # 1067424, for making some of our characterizations possible.

High-Performance Soya Polyurethane Networked Silica Hybrid Nanocomposite Coatings

The projected fossil fuel deposits depletion by near future and detrimental effects of petroleum products on environment has led to the development of volatile organic compound (VOC) free low molecular weight sustainable polymers, with promising applications in field of inks, adhesives, paints, and coatings. In view of this, present study reports synthesis, characterization, and anticorrosive performance of SMG-PU and modified SMG-PU through in situ formed silica networks (SMG-PU-TEOS) OIH polymer nanocomposite coatings on CS. The size of ∼30 nm silica nanonetworks were formed within SMG-PU on addition of TEOS, inducing thermal stability, hydrophobic, improved physicomechanical and corrosion resistant properties to polymer nanocomposite coatings. The corrosion protective performance of these coatings in 5% NaCl (salt mist test), 3.5% NaCl, and 3.5% HCl solutions revealed very lower Icorr values (3.8891 × 10–10 A cm–2 and 6.8756 × 10–9 A cm–2) as compared to SMG-PU (1.8159 × 10–8 A cm–2 and 9.1396 × 10–7 A...

Electrochemical Properties of a Novel β-Ta2O5 Nanoceramic Coating Exposed to Simulated Body Solutions.

To enhance the corrosion resistance, biocompatibility and mechanical durability of biomedical titanium alloys, a novel β-Ta2O5 nanoceramic coating was developed using a double glow discharge plasma technique. The surface morphology, phase composition and microstructure of the as-deposited coating were examined by atomic force microscopy (AFM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The coating exhibits a striated structural pattern along the growth direction, which consists of equiaxed β-Ta2O5 grains, 15-20 nm in diameter in cross-section, showing a strong (001) preferred orientation. The mechanical properties and contact damage resistance of the β-Ta2O5 coating were evaluated by nanoindentation. Additionally, scratch tests were performed to evaluate the adhesion strength between the β-Ta2O5 coating and the Ti-6Al-4V substrate. The β-Ta2O5 coating shows high hardness combined with good resistance to both indentation and scratch damage, thus favoring it for long-term load-bearing application in the human body. Electrochemical behavior of the coating was analyzed in both a 0.9 wt % NaCl solution and Ringer's solution at 37 °C, by various electrochemical analytical techniques, including potentiodynamic polarization, electrochemical impedance spectroscopy, potential of zero charge and Mott-Schottky analysis. Compared with uncoated Ti-6Al-4V and commercially pure tantalum, the β-Ta2O5 coating possesses a more positive Ecorr and lower icorr in both aqueous solutions, which is attributed to the thicker and denser β-Ta2O5 coating that provides more effective protection against corrosive attack. In addition, the β-Ta2O5 coating shows stable impedance behavior over 5 days immersion under both simulated body solutions, corroborated by the capacitance and resistance values extracted from the EIS data. Mott-Schottky analysis reveals that the β-Ta2O5 coating shows n-type semiconductor behavior and its donor density is independent of immersion time in both aqueous solutions. Its donor density is of the order of 1 × 1019 cm-3, which is an order of magnitude less than that of the passive films formed on either commercially pure Ta or uncoated Ti-6Al-4V. Moreover, according to the differences between corrosion potential and potential of zero charge, the β-Ta2O5 coating exhibits a greater propensity to repulse chloride ions than both commercially pure Ta and uncoated Ti-6Al-4V. Therefore, the newly developed coating could be used to protect the surface of biomedical titanium alloys under harsh conditions.

A nanocrystalline zirconium carbide coating as a functional corrosion-resistant barrier for polymer electrolyte membrane fuel cell application

A ZrC nanocrystalline coating is engineered onto a Ti–6Al–4V substrate using a double cathode glow discharge technique in order to improve the corrosion resistance and long-term stability of this alloy. The new coating exhibits an extremely dense, homogeneous microstructure composed of equiaxed grains with an average grain size of ∼12 nm and is well adhered on the surface of the substrate. The corrosion behaviour of the coating is systematically investigated using various electrochemical methods, including potentiodynamic, potentiostatic polarizations and electrochemical impedance spectroscopy (EIS), in a simulated polymer electrolyte membrane fuel cell (PEMFC) operating circumstances under different temperatures. The results show that with rising temperature, the corrosion potential (Ecorr) decreases and the corrosion current density (icorr) of the ZrC coated specimen increases, indicating that the corrosion resistance decreased with increasing temperature. However, at a given temperature, the ZrC-coated Ti–6Al–4V alloy has a higher Ecorr and lower icorr as compared to the bare substrate. The results of EIS measurements show that the values of the resistance for the ZrC coated Ti–6Al–4V alloy are three orders of magnitude larger than those of Ti–6A1–4V in the simulated PEMFC environment.

Preparation and characterization emulsion of PANI-TiO2 nanocomposite and its application as anticorrosive coating

Abstract Emulsion nanoparticles of polyaniline (PANI) were synthesized in the aqueous media by using hydroxylpropylcellulose (HPC) as a stabilizer and ammonium persulfate as an oxidant in the presence of TiO2 with nanometer size. New poly(vinyl acetate) (PVAc) coating over carbon steel was prepared by addition of emulsion nanoparticles in different concentrations (1%, 2% and 1.5%) in PVAc as the major matrix. The Tafel plot records were used for the definition of potential and corrosion current (Icorr). Nanoparticles were characterized and compared by X-ray diffraction (XRD), thermal gravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). By adding TiO2, the thermal stability of the nanocomposite increased. A small size of colloidal particles prevented the precipitation of conducting polymer particles and led to better dispersion of nanocomposites in the matrix of the PVAc binder; therefore, the paint was homogeneous and anticorrosion properties of the coating increased. According to the results, 1.5% of PANI-TiO2 nanocomposite in PVAc has a much lower Icorr in NaCl aqueous solution and 2% of PANI-TiO2 nanocomposite in PVAc has the best corrosion protection in HCl.

Effect of carbon content on nanostructural, mechanical and electrochemical characteristics of self-organized nc-ZrCN/a-CNx nanocomposite films

The nanocomposite nc-ZrCN/a-CNx films with a carbon content varying from 34 to 61at.% were deposited by filtered cathodic vacuum arc technique (FCVA) under different C2H2/N2 reactive gas flows. The effect of different carbon contents on compositional, nanostructural characteristics of nanocomposite nc-ZrCN/a-CNx films was investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscope (TEM), Raman scattering spectroscopy (Raman) and X-ray photoelectron spectroscopy (XPS). Results showed that nanocomposite nc-ZrCN/a-CNx films were composed of about 8nm sized ZrCN nanocrystalline embedded in different amount of a-CNx amorphous matrix. Mechanical properties of nanocomposite nc-ZrCN/a-CNx films showed a significant dependency on thickness of a-CNx matrix. Nanocomposite nc-ZrCN/a-CNx film reached the highest hardness (41GPa) and reduced modulus (320GPa) when the thickness of a-CNx matrix was around 0.4nm. Nanocomposite nc-ZrCN/a-CNx film at higher carbon content has lower friction coefficient (0.2) and better wear resistance. The nanocomposite films possess lower Icorr and higher Rp values than the single phase film.

Preparation and properties of Fe80−xNixP14B6 bulk metallic glasses

Bulk Fe80−xNixP14B6 (x=20, 30, 40, 50at.%) glassy alloy rods with the diameters of 1.0–2.5mm were synthesized by combining fluxing technique and J-quenching technique. The glassy alloy rods were characterized by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and vibrating sample magnetometer (VSM). It is found that the range of supercooled liquid region (ΔTx) is 27–32K. The saturation magnetization of Fe80−xNixP14B6 (x=20, 30, 40, 50at.%) bulk glassy alloys gradually decreases from 1.13T to 0.58T with increasing Ni content from x=20 to x=50. More importantly, the present quaternary FeNiPB bulk metallic glasses (BMGs) shows a significant plastic strain, in particular, the plastic strain of Fe30Ni50P14B6 BMG reaches as high as 11.7%. The corrosion resistance of the present FeNiPB BMGs was studied by weight-loss method, potentiodynamic polarization curves and scanning electron microscopy (SEM). It is shown that the corrosion resistance of the present FeNiPB BMGs in 0.5M NaCl and 1M HCl solution increases with Ni content, and further the present FeNiPB BMGs exhibit larger Ecorr values and lower Icorr values, i.e. higher corrosion resistances, than that of stainless steel.

Formation and Mechanical Properties of CoNiCuFeCr High-Entropy Alloys Coatings Prepared by Plasma Transferred Arc Cladding Process

Plasma transferred arc cladding process was used to fabricate CoNiCuFeCr multi-element alloys coatings. The experimental results show that the coating forms a face-centered-cubic solid solution phase. The microstructure of the coating is mainly composed of dendrite and discontinuous interdendritic segregation. The average hardness of the coating reaches 194.8 HV100. The nano-indentation testing indicates that the micro-hardness and elastic modulus of the coating are 3.64 GPa and 211 GPa, respectively. The CoNiCuFeCr high-entropy alloy coating has excellent wear and corrosion resistance. The wear resistance of the coating is about 1.7 times higher than that of Q235 steel substrate under the same wet sand rubber wheel abrasion testing conditions. In 1N hydrochloric acid solution, the coating presents lower icorr values in polarization curves and higher fitted Rf values in EIS plots than that of as-cast 304 stainless steel.

Silicon-substituted hydroxyapatite coating with Si content on the nanotube-formed Ti–Nb–Zr alloy using electron beam-physical vapor deposition

The purpose of this study was to investigate the electrochemical characteristics of silicon-substituted hydroxyapatite coatings on the nanotube-formed Ti–35Nb–10Zr alloy. The silicon-substituted hydroxyapatite (Si–HA) coatings on the nanotube structure were deposited by electron beam-physical vapor deposition and anodization methods, and biodegradation properties were analyzed by potentiodynamic polarization and electrochemical impedance spectroscopy measurement. The surface characteristics were analyzed by field-emission scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray diffraction (XRD). The Si–HA layers were deposited with rough features having highly ordered nanotube structures on the titanium alloy substrate. The thickness of the Si–HA coating was less than that of the HA coating. The XRD results confirmed that the Si–HA coating on the nanotube structure consisted of TiO2 anatase, TiO2 rutile, hydroxyapatite, and calcium phosphate silicate. The Si–HA coating surface exhibited lower Icorr than the HA coating, and the polarization resistance was increased by substitution of silicon in hydroxyapatite.

Microstructural evaluation and corrosion properties of aluminium matrix surface composite adding Al-based amorphous fabricated by friction stir processing

A novel aluminium matrix surface composite adding Al84.2Ni10La2.1 amorphous, which the layer depth was 5mm, was fabricated by friction stir processing. The surface composite region shows obvious sandwich structure. The average hardness of the surface composite is about HV97, higher than the base metal is about HV80. The maximum tensile strength of the processed aluminium plate with the surface composite is 410MPa. The surface composite was mainly composed of phases α-Al, Mg2Al3, MnAl6 and La3Al11. The surface composite added the amorphous strip had the lower icorr, corrosion current density, and the higher passivation current than the surface composite not added amorphous strip. And there is obvious passivation zone for the surface composite. However, a large number of ultrafine grained which was composed of the α-Al and α-Al amorphous structures can be observed in the surface composite. And the grain size range of them is 90–400nm. It is conceivable that the existence of these ultrafine grained structures and change of crystal plane would contribute greatly to improve the mechanical properties and corrosion resistance of the aluminium matrix surface composite.

Microstructure and corrosion properties of 5A06 aluminum matrix surface composite fabricated by friction stir processing

Abstract A novel aluminum matrix surface composite added with an Al-based amorphous was fabricated by friction stir processing (FSP). The surface composite region shows the obvious sandwich structure. It is considered to be a combination of the base metal and the amorphous strip via FSP. A large number of ultrafine-grained structures, which were composed of the α-Al and α-Al amorphous structures can be observed in the surface composite. The average hardness of the surface composite is about HV97, higher than the base metal, which is about HV80. The as-received sample has the highest resistance to corrosion in a salt solution. The surface composite added with the amorphous strip had lower icorr, corrosion current density, and higher passivation current than the surface composite not added with the amorphous strip.

Anticorrosion behavior of ultrafine-grained Al-26 wt% Si alloy fabricated by ECAP

Ultrafine-grained (UFG) Al-26 wt% Si alloy was obtained through multipass equal-channel angular pressing (EACP) procedure and subsequently tested in 3.5 wt% NaCl solution for the evaluation of electrochemical corrosion. The results show that the ECAPed alloy with increased number of pressing passes obtain lower mass-loss ratios, nobler Ecorr and Epit, lower Icorr values, and higher anode polarization. The improved corrosion resistance of the ECAPed alloy results from the homogeneous UFG structure with the breakage of brittle large primary silicon crystals, which contributes to a higher pitting resistance. The oxidation product with improved adhesion force and protection efficacy can be formed with greater ease on UFG alloys. It implies that grain refinement through severe-plastic-deformation can enhance anticorrosion behavior of hypereutectic Al–Si alloys, besides the well-known strengthening and toughening effects.

Wear and Corrosion Behaviors of FeCrBSiNbW Amorphous/Nanocrystalline Coating Prepared by Arc Spraying Process

FeCrBSiNbW coatings were synthesized using robotically manipulating twin wires arc spraying system. The microstructure and mechanical properties of the coating were characterized. The coating has a laminated structure, and its porosity is 2.8%. The microstructure of the coating consists of amorphous and α-(Fe,Cr) nanocrystalline. The nanocrystalline grains with a scale of 20-75 nm are homogenously dispersed in amorphous matrix. The results show that FeCrBSiNbW coating has excellent wear and corrosion resistance. The wear resistance of the coating is about 4.6 times higher than that of 3Cr13 coating under the same testing condition. In 3.5% NaCl aqueous solution, the amorphous/nanocrystalline coating presents lower I corr values in polarization curves and higher fitted R t values in EIS plots than that of the 0Cr18Ni9 coating (chemical composition by EDAX analysis: C1.07-O12.38-Si0.49-Cr15.18-Mn0.89-Ni7.09-Fe62.24 at.%).

Thermal, microbial, and corrosion resistant metal-containing poly(Schiff) epoxy coatings

Metal-containing epoxy resins [Er–M(II)] have been prepared by the reaction of Schiff base metal complexes and epichlorohydrin in basic medium. All the synthesized monomers and polymers were characterized by elemental, spectral (IR, 1H-NMR, and 13C-NMR), and thermal analysis. Coatings of the metal-containing epoxy resins were prepared on naval steel strips and subjected to physicomechanical and anticorrosive tests. The surface morphology and thickness of the coatings was found to be 75 ± 10 μm. The Zn(II) chelated epoxy resin showed lower I corr values of 0.482, 0.520, and 1.02 μA/cm2 in NaCl, NaOH, and HCl solution (3.5 wt%), respectively. In addition, the antimicrobial activity of the prepared coating strips was carried out by using minimum inhibitory concentration and minimum bactericidal concentration methods against S. aureus, B. subtilis, E. coli, and P. aeruginosa. It was found that the Er–Cu(II) showed higher antibacterial activity than other metal chelated epoxy resins.

Role of magnetic forces in pulse electrochemical deposition of Ni[sbnd]nanoAl2O3 composites

Pure and composite nickel deposits containing nano-Al2O3 particle (50nm) were produced under direct current (DCED) and pulsed current electrodeposition (PCED) conditions in the presence of magnetic field (MF). The influence of MF on the co-deposition of Al2O3 particles, texture coefficient of Ni and Al2O3, crystallite size, thickness, current efficiency and hardness of the deposits were investigated systematically. PCED regime exhibited higher incorporation nano-Al2O3 percentage than those obtained under DCED condition. The electrochemical impedance spectroscopy results show several order higher Rct and lower icorr for PCED NiAl2O3 in the presence of magnetic field (MF) than that of DCED NiAl2O3 composites.

440A 강의 균일부식에 미치는 합금원소와 열처리의 영향(I)

440A martensitic stainless steels which were modified with reduced carbon content(~0.5%) and addition of small amount of nickel, vanadium, tungsten and molybdenum were manufactured. Effects of alloying elements and tempering temperatures on the uniform corrosion in the solution of lN H2S04 were investigated through the electrochemical polarization test. When tempering temperature is constant, corrosion current density in active-passive transition point, Icorr, decreased a little with an increase of austenitizing temperature. In addition to this, when austenitizing temperature is constant, longer holding time showed a little lower Icorr and Ipass, passive current density. And when austenitized at and tempered in a range of , best anti-corrosion properties were obtained at tempering temperature while worst at or . The specimens tempered at below and above , similar and good anti-corrosion characteristics were obtained regardless of alloying elements added, showing anti-corrosion characteristics are influenced more by tempering temperature than by alloying elements.

Structure, current efficiency, and corrosion properties of brush electrodeposited (BED) Cr from Cr(III)dimethyl formamide (DMF)-bath

Chromium electrodeposited from Cr(III)dimethyl formamide-bath was studied using brush electrodeposition (BED) technique. The effects of current density and plating time on thickness and current efficiency were studied. An advantage of BED Cr was to produce selective area deposition on a suitable substrate. Chromium deposits were characterized using XRD, SEM, and AFM. From the electrochemical studies, BED Cr have higher charge transfer resistance Rct and very low Icorr than that of mild steel substrate.

Structure, microstructure and corrosion properties of brush-plated Cu–Ni alloy

Cu–Ni alloy coatings on copper substrate by the brush-plating process have been investigated using XRD and AFM. The X-Ray diffraction analysis revealed that the brush-plated Cu–Ni alloy was heterogeneous and composed of cubic Cu3.8Ni phases. Uniform surface coverage of the substrate by granular morphology was observed from AFM. The corrosion protection performance of the brush-plated Cu–Ni alloy on copper substrate has been assessed using electrochemical corrosion tests. These results indicated a high charge transfer and low I corr for the alloy system compared with copper deposits and the copper substrate.