Corrosion Resistance Behavior Research Articles

TiC morphology and corrosion resistance of CrMnFeCoNi+x(TiC) coatings prepared by laser cladding

The corrosion resistance of CrMnFeCoNi coatings with varying TiC contents and the evolution of TiC within these coatings were comprehensively investigated. These CrMnFeCoNi coatings, with different TiC concentrations, were fabricated using laser cladding technology. The behavior of TiC evolution in CrMnFeCoNi coatings was observed to follow a distinct pattern. At a TiC loading of 2 wt%, TiC exhibited a dispersed distribution. Interestingly, in coatings loaded with 4 wt% TiC, TiC was observed in various shapes, including elongated, square, petaled, and circular forms owing to the melting of TiC particles under the influence of a high-energy laser beam. The convection action of the molten pool combined several unmelted, partially melted, and precipitated TiC particles, resulting in diverse shapes. Furthermore, increasing the TiC content to 10 wt% led to the aggregation and fusion of TiC into clusters. Additionally, the electrochemical corrosion resistance behavior of CrMnFeCoNi coatings with varying TiC content displayed a significant correlation with the TiC concentration. As the TiC content increased, the galvanic corrosion resistance also increased. At lower TiC content levels, a higher number of electrochemical cells formed between the CrMnFeCoNi matrix and the dispersed TiC, leading to an elevated corrosion rate. In contrast, as the TiC content increased, the dispersed TiC phase fused together, reducing the likelihood of electrochemical cell formation. Notably, the electrochemical corrosion resistance of the CrMnFeCoNi coating containing 10 wt% TiC resembled that of the TiC-free coating.

Microstructural and electrochemical behavior of spark plasma sintered (Cu-10Zn) + Al2O3 nanocomposites

The present work deals with developing Al2O3 reinforced α-brass (Cu-10Zn) nanocomposites through spark plasma sintering and evaluated its electrochemical properties in a 3.5% NaCl aqueous solution. Microstructural analysis revealed the uniform dispersion of Al2O3 particles with inter-particle spacing ∼2.45 µm in 3 wt.% Al2O3 nanocomposites. The initiation of Al2O3 clustering and vast clustering of particles with wide particles-free-zone were observed in 6 and 9 wt.% Al2O3 nanocomposites. X-ray diffraction peaks confirm the crystallinity and incorporation of Al2O3 in the α-brass matrix. The corrosion behavior was studied by measuring the change in open-circuit potential values, electrochemical impedance spectroscopy (EIS), linear sweep voltammetry (LSV), and potentiodynamic polarization (PDP) studies in 3.5% NaCl solution. The 3 wt.% Al2O3 nanocomposites exhibited lower icorr value than the Cu-10Zn matrix and other Al2O3 reinforced nanocomposites. The EIS results confirm the surface layer enhancement and resistance to charge transfer in 3 wt.% Al2O3 nanocomposites due to their uniform distribution in the matrix. The uniformly embedded reinforcement particles abridged the prospects of galvanic coupling, which resulted in the upliftment of corrosion resistance and passivation behavior. An increase in the icorr value beyond 3 wt.% Al2O3 nanocomposites was due to the clustering of reinforced nanoparticles and vast particle-free zones and caused intergranular corrosion.

Investigations of the wear and corrosion characteristics of Al-SiC-WC hybrid composites produced via stir casting

In this research, AA6061 T6 composites were manufactured using a stir casting technique reinforced with silicon carbide and tungsten carbide. Three distinct compositions of samples were created by altering the weight proportion of silicon carbide and tungsten carbide (0%, 4%, and 8%). The powders were subjected to SEM analysis and Laser Particle Size analysis, followed by planetary ball milling. EDX analysis and XRD analysis were conducted to verify the chemical composition of the particles. Dry sliding wear characteristics were tested using pin-on-disc equipment and wear morphologies were investigated using SEM. Wear rate measured as volume of stock removed per meter length was found to be 1.26 × 10−3 mm3/m for 8% reinforced composites compared to 2.56 × 10−3 mm3/m for the basic material. The aqueous NaCl spray method was adopted to examine the corrosion resistance behaviour of composites. The investigations on corrosion were analyzed with potentiodynamic studies and found that reinforced composites show resistant to corrosion. 8% SiC, WC reinforced composites show improved corrosion resistance compared with unreinforced alloy. The research data shows that the material can be produced and employed in automotive, aerospace, braking application, marine environments etc.

Effect of yttrium addition on precipitated phase, corrosion resistance, and mechanical behavior of 6Mo superaustenitic stainless steel

Optimizing alloy composition is an effective method to regulate the microstructure and improve the properties of superaustenitic stainless steel (SASS). In this research, 6Mo SASS containing 16 ppm and 83 ppm yttrium (Y) was prepared, and the effects of Y microalloying on secondary phase precipitation and materials performance were investigated. It was found that higher Y content could better inhibit the sigma(σ) and Cr2N phase precipitation along the grain boundary, leading to the improvement of the intergranular corrosion (IGC) resistance and mechanical properties of aged steels.

Microstructure evolution and corrosion behaviors of cold-rolled 304 stainless sheets of steel in 3.5% NaCl solution

Austenitic stainless steel (ASS) is widely used in engineering applications due to its good corrosion resistance and mechanical properties. Several studies have indicated that the deformation-induced transformation of martensite in ASS significantly affects its corrosion resistance. However, corrosion resistance behavior in chloride-rich environments is more complex, and different cold-working methods have distinct impacts on localized corrosion. This study investigated the structural and corrosion resistance changes induced by cold rolling in AISI 304 samples. The used samples were initially subjected to a cold-rolling process with a thickness reduction of up to 50%. The results demonstrate an increase in the deformation-induced martensitic transformation and micro-hardness as the level of cold deformation increases. However, higher levels of deformation lead to the fragmentation of the formed a’‑martensite lath structure into smaller laths, ultimately resulting in a predominantly refined and diffuse dislocation-cell-type structure. Potentiodynamic tests were conducted to analyze conventional electrochemical parameters, revealing a reduction in corrosion resistance with increasing cold deformation. This suggests that the formation, amount, and microstructure of a’‑martensite, under imposed strain conditions, induce changes in the studied electrochemical parameters. Additionally, the more deformed samples exhibited a higher current density during passive layer formation, and exhibited more intense metastable pits, suggesting decreased corrosion resistance with higher degrees of deformation.

In Situ Growth of High-Performance ZnAl-Layered Double Hydroxides/Al2O3 Composite Coatings on Aluminum Alloy

In this research, high-performance ZnAl-layered double hydroxides (ZnAl-LDHs) with different Zn2+ concentrations were prepared on the surface of an anodized 1060 aluminum alloy using the in situ growth method, and the influence of Zn2+ concentration on corrosion resistance and tribological behavior was further explored. The surface morphology, element distribution, phase composition, and mechanical performance of ZnAl-LDHs/anodic aluminum oxide (AAO) composite coatings were tested and analyzed. Subsequently, the investigation of the anti-corrosion properties and tribological behavior of as-prepared composite coatings and AAO were conducted experimentally. The results show that with the increase in Zn2+ concentration, the thickness and bonding strength of the coatings gradually increase, and the hardness progressively decreases. The ZnAl-LDHs/AAO composite coating with a Zn2+ concentration of 0.3 mol/L exhibits the best anti-corrosion ability, which has the minimum corrosion current density of 2.435 × 10−9 A/cm2. This can be attributed to the uniform and compact ZnAl-LDH films where the porous structure of the AAO is well sealed. Moreover, the excellent friction-reduction and anti-wear properties of ZnAl-LDHs/AAO composite coatings with larger Zn2+ concentrations are verified using a ball-on-disc rotating wear tester under dry wear. A reasonable mechanism for improving tribological properties of resulting ZnAl-LDHs/AAO composite coatings is proposed.

Corrosion Resistance in Artificial Perspiration of Cr-Based Decorative Coatings.

We aim at developing hexavalent chromium-free coatings for frequently touched decorative parts. Cr(N,O) and multilayered CrN/CrO coatings were deposited by means of reactive magnetron sputtering. All samples presented good adhesion to the substrates enhanced by an epoxy layer designed to enhance PVD coating adhesion. Similar substrates are found in the automotive industry and can be used in appliances where a metallic finish is desired by the consumer. Corrosion behavior was induced, using artificial sweat to simulate long exposure to human touch for 96 h. In potentiodynamic polarization tests, the coatings were revealed to be nobler than the substrate alone. Cr displayed a non-existent passivation region, while gCrN exhibited a quick passivation of the surface and its respective breakdown and several current fluctuations, indicating the occurrence of pitting, which was confirmed by SEM micrography after the corrosion. Regarding EIS results, all films depicted a diminution of impedance modulus (|Z|) after 96 h, which indicates a diminution of corrosion resistance against artificial sweat. Nitride films exhibited the worst anticorrosive features. On the other hand, Cr and CrO exhibited the highest |Z| values. These results are corroborated by low the corrosion rates of both coatings. The equivalent electrical circuit allows us to confirm oxide formation in the outermost layer of the films due to electrolyte/surface interaction, indicating a self-protecting mechanism. Nitride films showed the lowest values and less corrosion resistance, confirming the results obtained in polarization potentiodynamic tests. The coatings developed in this work, namely Cr and CrO, showed a promising corrosion resistance behavior that could endure a lifetime of frequent human touch in various decorative applications either automotive or general appliances.

In-depth analysis of corrosion-resistance and dynamic stability of superhydrophobic copper developed by a green approach

This study gives a systematic analysis of corrosion resistant behaviour of superhydrophobic copper fabricated by two-step (electrodeposition followed by coating) and one-step (coating without electrodeposition) processes using behenic acid. Wetting and corrosion characteristics of coated copper have been continuously evaluated by abrasion with sand paper, immersion in acidic and alkaline solutions, and heating at elevated temperature. Although, wetting properties of coating have been obviously decreased with continuous abrasion, contact with acidic and alkaline ambiance, and hot temperature exposure, but corrosion properties of coated copper have not shown the similar trends which has been discussed through polarisation tests and EIS study in detail. Additionally aforesaid both processes generate durable superhydrophobic copper surface with excellent corrosion-resistant and anti-wetting characteristics; however, a two-step process is proved more efficient than the one-step process and promises to produce anti-wetting coatings for real-world applications.

A Study on the Corrosion Resistance of a Coating Prepared by Electrical Explosion of 321 Metal Wire

Corrosion is known as a breakdown effect that causes the deterioration of substances in enriched petroleum/gas conditions. This reaction occurs in all materials, which is highlighted in alloys. In the present study, the morphological properties, as well as the corrosion resistance behavior of the AISI1045 steel substrate coated with 321 austenitic stainless steel metal particulate fillers, were investigated. The electro-explosive spraying technique was employed to achieve a homogenous coating on the substrate surface. According to the results, the grain size of the 321 austenitic stainless steel coating layer was shrunk and reduced to 1–3 μm after the coating procedure. The coated layer also showed a homogenous and uniform thickness with an average value of 137 μm. Also, the average adhesion strength of 49.21 MPa was obtained between the sprayed coating and the substrate. The analytical analysis found the presence of Fe-Cr and Fe-Ni phases in the coating layer. The hardness of the original metal wire is 186 HV, and the microhardness of the coating after spraying is 232 HV. After subjecting the specimen to the corrosion examination, a 0.1961 mm/a corrosion rate was obtained for up to 120 h. Moreover, the corrosion products of CaCO3, Fe3O4, and MgFe2O4 were determined by XRD analysis. Furthermore, the observed results were further confirmed by the data obtained from EPMA and EDS evaluations. Hence, this study implies the beneficial role of electro-explosive sprayed alloy 321 austenitic stainless steel in creating a protective layer against corrosion on 45 steel substrate in an enriched oil/water environment.

Comparative study on weld characterisation and corrosion performance of laser-welded NiTinol

ABSTRACT Laser welding of NiTinol is a promising fabrication method. An understanding of the effects of laser heat input on different surface properties and corrosion resistance behaviour is needed for laser-welded sea water-flooded components of NiTinol. Here the effect of laser heat input on various physical, chemical and mechanical surface properties along with the corrosion resistance behaviour of the laser welded samples was investigated. The corrosion resistance performance of the phase-separated samples was found to be inferior to the other laser-welded samples. The top surface showed a superior corrosion resistance performance because of the recirculation of the melt pool and Ti enrichment on top surface.

Electrochemical corrosion behavior of plasma sprayed Cr2O3-25TiO2 composite coatings

In this paper, Cr2O3-25TiO2 composite coatings were prepared on the surface of steel structure samples by atmospheric plasma spraying. The phase composition, microstructure, microhardness and long-term immersion corrosion behavior in 3.5 wt.% NaCl solution of Cr2O3-25TiO2 composite coatings were studied. The corrosion behavior of Cr2O3-25TiO2 composite coating was analyzed by potentiodynamic polarization and electrochemical impedance spectroscopy. The impedance data were fitted into an appropriate equivalent circuit to explain the electrochemical corrosion behavior of the coating at different stages. The results of scanning electron microscopy showed that the Cr2O3-25TiO2 composite coating was agglomerated, and the rhombohedral Cr2O3 powder was wrapped around the rhombohedral TiO2 powder. The coating melted completely without obvious defected. The XRD results showed that no phase transformation occurred in the Cr2O3-25TiO2 composite coating. The Cr2O3-25TiO2 coatings showed high corrosion resistance and good passivation behavior in the initial stage of corrosion. The coating itself did not corrode. With the extension of corrosion time, the corrosive medium had passed through the pores between the coatings, resulting in the contact between the corrosive medium and the matrix interface, resulting in the matrix corrosion damage. Corrosion products would deposit on the surface of the coating, blocking the pores between the coatings, and the corrosion rate would be reduced.

Microstructure and properties of in-situ nickel-aluminum bronze coating by underwater wire-feed laser cladding

The in-situ laser cladding layer on nickel-aluminum bronze was prepared in water environment directly by the underwater wire-feed laser cladding technology for the first time, in which the local dry cavity was generated by a self-designed underwater laser cladding nozzle to protect the cladding zone from water environment. After optimizing the processing parameters such as the protection gas flow rate, laser power and lap ratio, the underwater alloy coatings with good formability without internal defects were obtained, and the interaction mechanism of water environment on the microstructure evolution, mechanical properties and corrosion resistance behavior of cladding was investigated. The results showed that the large cooling rate during underwater laser cladding process inhibited the eutectoid transformation from the high-temperature β phase to the α phase, resulting in an increase in the proportion of the β′ phase and finer α layer structure in the underwater laser cladding layer. Compared with the in-air cladding layer, the grains in the underwater cladding layer were smaller, and more low-angle grain boundaries were observed. The grain refinement and the increase of the β′ phase ratio as well as grain boundaries gave rise to the higher microhardness of the underwater cladding metal. The electrochemical response of the cladding layer was primarily influenced by the presence of copper, resulting in similar corrosion resistance among the cladding layer samples.

Biofunctionalized nanocomposite coating on Cp-titanium with reduce implant failures

Titanium alloys are extensively used in orthopedic implants due to their excellent physicochemical properties and good biocompatibility. However, in reality, titanium implants could malfunction or become infected around the implant. In this present work, the fabrication of nanocomposite coating of graphene oxide/chitosan/silver nanoparticles (GO/Ag/CS) on commercially pure titanium (Cp-Ti) to improve corrosion resistance and antibacterial property. The nanocomposite of GO/Ag/CS coating was developed electrophoretically deposition on the Cp-Ti for different time duration. The deposition time was optimized at 10 min. The surface morphology of 10 min nanocomposite coating was uniform and agglomerated structure forming a network-like structure and EDAX mapping confirms the even distribution of the coating. The potentiodynamic polarization and electrochemical studies assure that the nanocomposite coating was efficient in reducing the corrosion rate due to the formation of the barrier layer. The bacterial adhesion on the GO/Ag/CS coating surface was effectively reduced. Hence, nanocomposite coating on Cp-Ti has improved the corrosion resistance and antibacterial behavior; thereby the possibility of implant failure can be greatly reduced.

Polypyrrole-Modified Molybdenum Disulfide Nanocomposite Epoxy Coating Inhibits Corrosion of Mild Steel

The search for lightweight and low-cost anticorrosion coatings is particularly important in coastal environments with high salt and humidity. Graphene-based anticorrosion coatings are currently unable to provide long-lasting corrosion protection for metals because of their “corrosion-promoting activity”, and graphene-like materials, such as molybdenum disulfide (MoS2), are beginning to be anticipated its ability to protect against metals. This paper reported a simple method for preparing polypyrrole (PPy)-modified MoS2 nanomaterials from natural bulk MoS2. Their corrosion resistance behavior as fillers for epoxy (EP) resins was investigated in 3.5 wt.% NaCl solution. After the preparation of the MoS2 nanosheet dispersion by liquid-phase sonication using ethanol aqueous solution, the polypyrrole-coated molybdenum disulfide nanomaterials (MoS2@PPy) were directly obtained by adding pyrrole monomer to it in the presence of the initiator ammonium persulfate. Tafel polarization curves showed that the corrosion current of the MoS2@PPy/EP coating was 0.006 µA/cm2 after 15 days of immersion in 3.5 wt.% NaCl solution, much lower than that of pure EP coating (19.134 µA/cm2), effectively improving the anticorrosive properties of the coating. Overall, this study offered a practical method for the application of natural bulk MoS2 for corrosion protection.

Effect of subcritical-temperature heat treatment on corrosion of SLM SS316L with different process parameters

This study focuses on regulating the 316 L stainless steel manufactured by selective laser melting (SLM) microstructure and analyzing the influence between it and the corrosion resistance behaviors. The results show after the same subcritical-temperature heat treatment (950 °C). For the high-parameter (HP) samples, the high-density dislocation of the cellular substructures and the molten pool boundaries are eliminated. The nano inclusions are further evenly distributed, which enhances the corrosion resistance. However, the melt pool boundary of low-parameter (LP) samples is no longer eliminated, and nano-inclusions are agglomerated, resulting in reduced corrosion resistance.

Corrosion Resistant Coating from Nano Printed Circuit Board Powder for the Reinforced Concrete Structures

Corrosion in steel leads to the deterioration of reinforced concrete structures due to chemical reactions between steel and its surrounding atmosphere. In this paper, a novel anticorrosive powder was derived from the waste Printed Circuit Board (PCB) and manually coated on the steel rebar of the reinforced concrete specimen. The corrosion-resistant efficiency of the developed nano PCB-coating on the steel bars was studied by polarization, electrochemical impedance spectroscopy, and accelerated corrosion technique. Also, the applicability of the nano PCB-coated rebar as reinforcement in the concrete environment was investigated. From the results, it was observed that the nano PCB-coated specimens exhibited 3.5 times reduced rate of corrosion and lost only 46.15% strength and 52.5% diameter under the accelerated rate of 6 V after 48 hours. The presence of nano PCB powder improved the corrosion-resistant behaviour of the steel rebar by 1.65 times of the noncoated specimen. Also, the nano PCB-coating reduced the loss in residual yield strength of the corroded steel rebar by 32% lesser than the noncoated specimens and exhibited similar corrosion-resistant properties as that of the existing zinc coating. In addition to the corrosion resistance, the nano PCB-coated steel rebar exhibited almost similar adhesion with concrete as that of the commercial zinc coating which is 7% lower than uncoated steel rebars. It was inferred from this research work that the proposed anticorrosive coating prepared from the waste nano PCB powder showed better corrosion-resistant behaviour and reduced the overall cost of coating by 42%, which ensures economy and serviceability.

Fluorite-pyrochlore structured high-entropy oxides: Tuning the ratio of B-site cations for resistance to CMAS corrosion

As gas turbine inlet temperatures continue to rise, new thermal barrier coating (TBC) materials must be developed urgently. This work investigated molten silicate corrosion, thermal conductivity, and high-temperature phase stability of a new class of high-entropy oxides (HEO) as potential protective coating materials. With composition tuning, high-entropy RE2B2O7 (RE= Gd, Sm, Y, Pr, La; BCe, Zr) can be transformed from pyrochlore to fluorite structures. They all exhibited phase stability when annealed at 1600 ℃ for 10 h and very low thermal conductivity (1.21–1.39 W·m−1·K−1) compared to conventional materials with better thermal protection. In addition, the CMAS corrosion resistance behavior of all samples at 1300 °C and 1500 °C was investigated, and it was found that the infiltration thickness decreased with increasing Ce content (down to ∼10 µm for 5 h at 1500 °C). The RE2Ce2O7 had the most substantial CMAS resistance, forming a dense barrier layer composed of uniformly fine crystal grains during the reaction. The results of this study establish the foundation for future applications of RE2B2O7 in thermal protection systems.

Adsorption Characteristics between Ti Atoms of TiO2(100) and Corrosive Species of CO2-H2S-Cl- System in Oil and Gas Fields.

The service environment of OCTG (Oil Country Tubular Goods) in oil and gas fields is becoming more and more severe due to the strong affinity between ions or atoms of corrosive species coming from solutions and metal ions or atoms on metals. While it is difficult for traditional technologies to accurately analyze the corrosion characteristics of OCTG in CO2-H2S-Cl- systems, it is necessary to study the corrosion-resistant behavior of TC4 (Ti-6Al-4V) alloys based on an atomic or molecular scale. In this paper, the thermodynamic characteristics of the TiO2(100) surface of TC4 alloys in the CO2-H2S-Cl- system were simulated and analyzed by first principles, and the corrosion electrochemical technologies were used to verify the simulation results. The results indicated that all of the best adsorption positions of corrosive ions (Cl-, HS-, S2-, HCO3-, and CO32-) on TiO2(100) surfaces were bridge sites. A forceful charge interaction existed between Cl, S, and O atoms in Cl-, HS-, S2-, HCO3-, CO32-, and Ti atoms in TiO2(100) surfaces after adsorption in a stable state. The charge was transferred from near Ti atoms in TiO2 to near Cl, S, and O atoms in Cl-, HS-, S2-, HCO3-, and CO32-. Electronic orbital hybridization occurred between 3p5 of Cl, 3p4 of S, 2p4 of O, and 3d2 of Ti, which was chemical adsorption. The effect strength of five corrosive ions on the stability of TiO2 passivation film was S2- > CO32- > Cl- > HS- > HCO3-. In addition, the corrosion current density of TC4 alloy in different solutions containing saturated CO2 was as follows: NaCl + Na2S + Na2CO3 > NaCl + Na2S > NaCl + Na2CO3 > NaCl. At the same time, the trends of Rs (solution transfer resistance), Rct (charge transfer resistance), and Rc (ion adsorption double layer resistance) were opposite to the corrosion current density. The corrosion resistance of TiO2 passivation film to corrosive species was weakened owing to the synergistic effect of corrosive species. Severe corrosion resulted, especially pitting corrosion, which further proved the simulation results mentioned above. Thus, this outcome provides the theoretical support to reveal the corrosion resistance mechanism of OCTG and to develop novel corrosion inhibitors in CO2-H2S-Cl- environments.

Improvement of the corrosion performance of a cold-rolled Co40Cr20Ni30Al5Ti5 high-entropy alloy by adjusting annealing treatments

High-entropy alloys (HEAs) are expected to possess various excellent properties due to their vast composition design space and unique core effects. Annealing treatments after cold rolling are widely discussed as an effective means to improve the overall performance of the alloy. Nevertheless, the effect of annealing treatments on the corrosion resistance of cold-deformed alloys is still somewhat controversial. Therefore, cold rolling and annealing at different temperatures are performed on the Co40Cr20Ni30Al5Ti5 high-entropy alloy to investigate the effect of annealing temperature on its corrosion behavior. The annealing temperature range covers all stages of the HEA recovery-recrystallization-grain growth (in 50 °C gradients). The experimental results show that the HEA recrystallization is fundamentally complete at 850 °C and fully austenitized at 1050 °C. The best corrosion resistance performance is observed at 850 °C, with the lowest corrosion current density (ipass) and the lightest pitting in full immersion experiments. In addition, excellent passivation properties, such as the lowest steady-state current density iss and highest passivation film growth rate, are achieved at 850 °C. Further analyses of the growth films also show that the passivation films formed at 850 °C are thicker and uniform, and additionally have the highest Cr2O3 content. Accordingly, the effects of annealing temperature on HEA corrosion resistance and passivation behavior are discussed. The superior corrosion resistance and passivation behavior at 850 °C are attributed to the coupling of grain size and passivation film composition. The current findings might guide the optimized design of future cold-deformed alloys for better corrosion resistance.

Effect of nano cementitious composites on corrosion resistance and residual bond strength of concrete

The interconnection between the steel and concrete is frequently weakened by corrosion. Interestingly, it has been observed that nano pozalonic materials offer an economical approach for lowering the permeability of concrete by enhancing its morphological characteristics. This research discusses the impact of nano pozalonic materials on strengthening the corrosion resistance and pull-out behaviour of steel reinforcement in concrete. In order to treat concrete specimens with accelerated or immersion-based corrosion procedures, the cement is replaced with nanocement (NC) or nano fly ash (NFA).The performance of concrete is tested by evaluating its compressive strength, chloride ion penetration, corrosion potential, and water permeability. The steel reinforcement is examined to assess the residual yield strength and mass loss. In order to assess the bond-slip behaviour between concrete and the reinforcing steel, pull-out tests are performed. Our findings indicate that concrete with nano cement and nano fly ash exhibited excellent corrosion resistance by retaining the yield strength of reinforcement steel and corresponding bond strength.