Corrosion Resistance Properties Research Articles

Research on Laser Cladding Inconel 625 Coating Process for TRT Blades

In this study, Inconel 625 coatings were deposited onto the surface of 2Cr13 stainless steel via laser cladding technology to ensure their corrosion resistance and mechanical properties. The microstructure and characteristics of coatings were adjusted by varying laser power (1200, 1500, and 1800 W), scanning speed (10, 15, and 25 mm/s), and overlap rate (40%, 50%, and 70%). The results showed that the impact resistance of blades was improved by 23% to 30% compared to the substrate, whereas the self-corrosion current density was reduced by 94%–98%, which indicated the outstanding resistance of specimens to damage and corrosion. At the same time, the appropriate processing parameters enabled the surface hardness of the 2Cr13 substrate to be improved. This study provides practical technical guidance for the repair of 2Cr13 blades and a comprehensive enhancement of their corrosion resistance and mechanical properties through parameter optimization.

Microstructure evolution and corrosion behavior of metastable β Ti-18.4Nb-5Zr alloy with low modulus after thermomechanical treatment

In this paper, the effects of precipitate phases on the mechanical properties and corrosion resistance of newly developed β-type Ti-18.4Nb-5Zr (at. %) (TNZ) alloy after thermomechanical treatment that combines cold rolling (CR) with annealing were investigated. With the cold rolling reduction rate to 94%, nano-grained (NG) TNZ alloy with average grain size about 34 nm was produced and the alloy was composed of β phase, α″ phase and ω phase. After short-time annealing, a small amount of α phase and fine athermal ω phase are precipitated, which promoted the disappearance of stress-induced α″ phase. As the annealing temperature increased, the α phase transformed to the β phase and the athermal ω phase gradually disappeared. The number and size of α phase and athermal ω phase increase with the increase of annealing time, which promoted the increase of elastic modulus and plasticity. After polarization treatment in Hank's solution, the corrosion resistance of TNZ alloy was improved and a double-layer film structure was formed. But the corrosion rate of the alloy surface increased significantly with annealing time. The NG alloy after annealing at 550 °C / 10 min exhibited good corrosion resistance and mechanical properties with elastic modulus of 28.4 ± 3.6 GPa, which matched with human bone.

Exploring the Effect of Lanthanum on the Corrosion Resistance and Antimicrobial Properties of Fe–20Cr–18Ni–6Mo–0.8Cu–0.2N Stainless Steel in Seawater

This study investigates the effects of lanthanum (La) on the microstructure and corrosion resistance of Fe–20Cr–18Ni–6Mo–0.8Cu stainless steel in seawater. Microstructural analysis shows that La addition refines grain size and alters precipitated phases. X‐ray diffraction confirms austenitic structures, while transmission electron microscopy reveals the formation of Cu5La compounds and ferrite/σ phases. Electrochemical tests indicate that the sample without La has the highest open‐circuit potential and best corrosion resistance in nonseawater conditions. However, after 16 days of seawater exposure, the 0.5 wt% La sample exhibits superior corrosion resistance with a corrosion rate of 0.0175 mm/a, while higher La contents (1.0 wt% and 1.5 wt%) leads to poor corrosion resistance and large corrosion craters. Scanning electron microscopy confirms minimal surface corrosion for the 0.5 wt% La sample. In sulfate‐reducing bacteria environments, La enhances corrosion resistance, except for pitting corrosion observed in the 1.5 wt% sample. Scanning Kelvin probe force microscopy shows minimal surface potential fluctuation (from −30 to 10 mV) for the 0 wt% La sample, indicating the best corrosion resistance. This study provides insights into the role of rare earth elements in super austenitic stainless steels.

Modulating Micro-Arc Oxidation Coating Properties on 6061 Aluminum Alloy via OH− to F− Ion Ratio Optimization

We investigate the influence of the NaOH to KF ratio in a silicate electrolyte on the corrosion resistance and tribological properties of micro-arc oxidation (MAO) coatings on a 6061 aluminum alloy. By optimizing the electrolyte composition, we achieved significant improvements in coating quality. The surface morphology and composition of the coatings were characterized using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). Our findings reveal that the coatings produced at a 2:1 NaOH/KF ratio exhibited superior corrosion resistance, with a corrosion potential of −1.279 V, corrosion current density of 1.85 × 10−7 A·cm−2, and protective resistance of 1.50 × 105 Ω·cm2. Additionally, the surface roughness and coating thickness were measured at 0.68 μm and 8.04 μm, respectively, providing a robust foundation for enhancing the anticorrosive and wear-resistant properties of 6061 aluminum alloy.

High-temperature diffusion behavior, wear-resistance and corrosion-resistance properties of Al2O3, MoS2, and ZnO nanoparticles on copper surfaces

High-temperature diffusion behavior, wear-resistance and corrosion-resistance properties of Al2O3, MoS2, and ZnO nanoparticles on copper surfaces

Characterization of Microstructure and Localized Corrosion Resistance of Heat-Treated 17-4 PH Stainless Steel Fabricated by Material Extrusion

The quality, reproducibility, and reliability of additive manufactured parts strongly depend on optimizing printing parameters and post-processing treatments. This study evaluates the effects on the microstructure and corrosion resistance properties of solution annealing and aging heat treatments performed on 17-4 PH stainless steel samples fabricated with different build-up orientations using a material extrusion technology: the Bound Metal DepositionTM. The chemical composition and microstructures were determined using X-ray diffraction, chemical etching, optical microscopy, and scanning electron microscopy. The corrosion resistance properties in neutral sodium chloride electrolytes were investigated through cyclic potentiodynamic polarization and open circuit potential monitoring and analysis. The findings demonstrated that the solution annealing heat treatment remarkably enhanced the overall corrosion resistance properties of the samples. The improvement was attributed to the growth of the ferritic phase along the grain boundaries of the martensitic matrix and a finer dispersion of copper precipitates. The aging heat treatment performed after solution annealing enhanced the ferritic phase development, resulting in a further improvement of the localized corrosion resistance properties.

Hot-Pressing of Ti-Al-N Multiphase Composite: Microstructure and Properties

This study focuses on the development and characterization of a bulk Ti-Al-N multiphase composite enriched with BN addition and sintered through hot pressing. The research aimed to create a material with optimized mechanical and corrosion-resistant properties suitable for demanding industrial applications. The composite was synthesized using a powder metallurgy approach with a mixture of AlN, TiN, and BN powders, processed under a high temperature and pressure. Comprehensive analyses, including microstructural evaluation, hardness testing, X-ray tomography, and electrochemical corrosion assessments, were conducted. The results confirmed the formation of a multiphase microstructure consisting of TiN, Ti₂AlN and Ti₃AlN phases. The microstructure was uniform with minimal porosity, achieving a hardness within the range of 500–540 HV2. Electrochemical tests revealed the formation of a passive oxide layer that provided moderate corrosion resistance in chloride-rich environment. However, localized pitting corrosion was observed under extreme conditions. The study highlights the potential of a BN admixture to enhance mechanical and corrosion-resistant properties and suggests directions for further optimization in sintering processes and material formulations.

Enhancing corrosion resistance of Nd-Fe-B magnets with amorphization Ni-P coatings

Nd-Fe-B permanent magnets, due to the unique phase structure, demand exceptional corrosion resistance. Electrodeposited nickel-phosphorus (Ni-P) coatings are recognized for their superior anti-corrosion performance, but the performance of electrodeposited Ni-P coatings with different crystallinity varies considerably from process to process. In this study, we propose a strategy to grow Ni-P coatings that exhibit varying crystallographic orientations and degrees of crystallinity. Meanwhile, the differences in structure, morphology, corrosion resistance, and mechanical properties between crystalline and amorphous Ni-P coatings were systematically investigated. The results show that the crystalline Ni-P alloy coating predominantly forms on the Ni(111) crystal plane, with poor surface topographic flatness. In contrast, the amorphous Ni-P coating demonstrates better surface topographic flatness. The crystalline Ni-P alloy coating exhibits a corrosion potential of −0.63 V, a corrosion current density of 5.6 × 10−7 A cm−2, and a hardness of 583HV. In comparison, the completely amorphous Ni-P alloy coating shows an improved corrosion potential of −0.38 V, an exceedingly low corrosion current density of 9.5 × 10−10 A cm−2, and an increased hardness of 622HV.

Stochastic free vibration characteristics of cracked porous functionally graded plates in thermal environment

This article comprehensively investigates the stochastic free flexural vibration of cracked plates made of porous functionally graded materials (P-FGM) in a thermal environment. Functionally graded materials are high-class materials used in the aerospace sector, nuclear sector, turbine blades, and other commercial applications for heatshields, wear-resistant, and corrosion-resistant properties. The extended finite element method is implemented to solve the cracked P-FGM plate. The higher-order shear deformation theory is incorporated into the numerical technique for plate kinematics. The first-order perturbation technique is used to address the randomness in material parameters. The crack is traced by the level-set method. The augmentation of the primary variable near the crack is done with the addition of enrichment functions. The effective material properties of the P-FGM plate are achieved by implementing the Power law and the rule of mixture. The gradation of the constituent materials is assumed across the thickness only. The comparison study is performed to check the efficacy and accuracy of the developed mathematical formulation. Numerical simulation is performed for various parameters and comparative results are presented. The influence of material uncertainty, porosity, temperature effect, and cracks on free flexural vibration response is reported in detail.

Mechanical and corrosion behavior of CoCrFeNiAl0.3 high entropy alloy seamless tubes

An urgent need arises for alloys that possesses superior ductility and good corrosion resistance, essential for applications in highly harsh environmental conditions. The corrosion resistance and mechanical properties of CoCrFeNiAl0.3 high-entropy alloy seamless tubes (HEASTs) are investigated in this study. Electron Channeling Contrast Imaging (ECCI) and Electron Backscatter Diffraction (EBSD) techniques reveal the presence of abundant dislocations within the inner crystals, highlighting the alloy's excellent deformation ability. The formation of the B2 phase significantly influences corrosion behavior, with higher B2 content promoting pit propagation and enhancing pitting corrosion. Corrosion test results demonstrate the superior pitting corrosion resistance of TR-22 tubes, attributed to their lower B2 phase content and effective coverage by a protective passive film formed by Al, Cr, and Fe. X-ray photoelectron spectroscopy (XPS) analysis further elucidates the correlation between B2 phase content and corrosion resistance, emphasizing the importance of controlling B2 content to optimize microstructure. Overall, this study provides valuable insights into enhancing the corrosion resistance and mechanical properties of high-entropy alloy seamless tubes, contributing to the development of advanced materials in engineering applications.

Investigation of laser cladding using Inconel 625-Enhanced Fe-Based Coatings: Microstructure, wear Behavior, and corrosion resistance properties

Investigation of laser cladding using Inconel 625-Enhanced Fe-Based Coatings: Microstructure, wear Behavior, and corrosion resistance properties

Improvement of the long-term corrosion resistance and adhesion property of waterborne polyurethane coatings by physical mixing with silane-grafted nano-SiO2/TiO2

Improvement of the long-term corrosion resistance and adhesion property of waterborne polyurethane coatings by physical mixing with silane-grafted nano-SiO2/TiO2

Corrosion resistance and antibacterial properties of Ti−3Cu alloy prepared by selective laser melting

Corrosion resistance and antibacterial properties of Ti−3Cu alloy prepared by selective laser melting

Enhanced corrosion resistance and photothermal antibacterial properties of MAO/PCL-PDA/NG composite coating on Mg alloy

Enhanced corrosion resistance and photothermal antibacterial properties of MAO/PCL-PDA/NG composite coating on Mg alloy

Effect of WC Particle Reinforced Nickel-Based Coatings on Corrosion Resistance and Wear Properties of Q345 Steel

Effect of WC Particle Reinforced Nickel-Based Coatings on Corrosion Resistance and Wear Properties of Q345 Steel

Biodegradable Zinc-Magnesium Alloys for Bone Fixation: A Study of Their Structural Integrity, Corrosion Resistance, and Mechanical Properties

Biodegradable Zinc-Magnesium Alloys for Bone Fixation: A Study of Their Structural Integrity, Corrosion Resistance, and Mechanical Properties

A significant improvement in corrosion resistance and mechanical properties of Cu-containing nanocrystalline Ti-Mo-Nb-Ta refractory complex concentrated alloy

A significant improvement in corrosion resistance and mechanical properties of Cu-containing nanocrystalline Ti-Mo-Nb-Ta refractory complex concentrated alloy

Development of nonisocyanate polyurethane–MWCNT nanocomposites: coatings with enhanced antifouling, corrosion resistance and UV protection properties

Castor oil cyclic carbonate and sustainable linalool diamine were subjected to polyaddition to form nonisocyanate polyurethanes (NIPU) and NIPU nanocomposites (NIPU-NC) with MWCNTs / functionalized MWCNTs via non-covalent and covalent incorporation.

Studying the effect of processing parameters on the microstructure, strength, hardness, and corrosion characteristics of friction stir dissimilar welded AA5083 and AA7075 aluminum alloys reinforced with Al-SiC matrix.

The complementary properties of corrosion resistance and ballistic resistance of AA5083 and AA7075, respectively, explain the significance of welding these two alloys in the marine armor industry. This study investigates a novel Al-SiC matrix reinforcement with a different SiC weight ratio in dissimilar friction stir welding of the AA5083/AA7075 joint at different transverse and rotational speeds. The study deduced that the novel matrix can play an important role in improving strength and ductility simultaneously. Maximum strength takes place under conditions of 50% SiC in Al-SiC matrix, 900rpm rotational speed, and 40mm/min transverse speed of value 209.8MPa, which is equal to 90% strength of the base metal AA5083, and the maximum strain takes place at 25% SiC in Al-SiC matrix, 900rpm rotational speed, and 20mm/min transverse speed, with improved strain by 2% than the softer alloy AA5083. Corrosion weight loss decreased by increasing the SiC weight ratio in the Al-SiC matrix, where it improved by 47.9% compared to the base metal alloy of AA5083 at 75% SiC in the Al-SiC matrix, 900rpm rotational speed, and 20mm/min transverse speed.

TiO2-Modified Graphene Oxide Fillers Strengthen Acrylic Coated Samples Corrosion and Weathering Resistance on Q235 Steel.

As an exceptional 2D nanofiller, graphene oxide (GO) is extensively employed to amplify the protective properties of coatings. The dispersion of GO significantly influences the protective efficacy of the coatings. Here, a surface modification of GO through the integration of nanosized titanium dioxide (TiO2) was employed, thereby facilitating the synthesis of an FGO-TiO2 nanoparticle characterized by a substantial interlayer spacing (0.91 nm). Subsequently, FGO-TiO2 nanofiller was incorporated into an acrylic coating matrix, resulting in an advanced acrylic coated sample that simultaneously exhibits both corrosion resistance and UV protection properties. EIS analysis revealed that, after 350 h of immersion, the low-frequency impedance modulus of the FGO-TiO2/acrylic coated sample reached 1.028 GΩ·cm2, a significant increase compared to the pure acrylic coated sample (0.017 GΩ·cm2). This improvement suggests the enhanced dispersion of FGO-TiO2 in the acrylic coating, which effectively lengthens the diffusion path for corrosive agents, and it is anticipated to replace the conventional primer-topcoat composite coating system.