Corrosion Behavior Research Articles

Effect of microstructure and grain boundary character distribution on the corrosion behavior of weathering bridge steel

Effect of microstructure and grain boundary character distribution on the corrosion behavior of weathering bridge steel

Tribology and Hot Corrosion Behavior of MCrAlY-Based Multicomponent Coatings Containing Copper

Tribology and Hot Corrosion Behavior of MCrAlY-Based Multicomponent Coatings Containing Copper

Microstructure, mechanical properties, and corrosion behavior of novel antibacterial Ti-25Nb-xCu for dental implant

Microstructure, mechanical properties, and corrosion behavior of novel antibacterial Ti-25Nb-xCu for dental implant

Research on the Corrosion Behavior of Mo/C276 Coating Deposited by HVOF Method in Deep-Sea Cold Seep Environments

In this study, the Mo/C276 coating was deposited on Q690E steel by high velocity oxy-fuel spraying (HVOF), and the coating was treated with an organosilicon sealer. Further, the corrosion behaviors of the coating in the simulated deep-sea cold spring environment with hydrogen sulfide and high pressure were studied. The results show that when the oxygen flow rate is 220 NL/min, the coating has the lowest porosity of 1.71% and excellent mechanical properties. Combined with the micromorphology and elemental analysis of the coating, it was assumed that the Fe element generated by the corrosion of the Q690E substrate migrates to the surface of the coating. The corrosion tests in the simulated deep-sea cold showed that before the failure of the coating in the edge and corner areas, the corrosion rate of the coating was less than 0.002 mm/a, which could meet the long-term use requirements in the real cold spring environment.

Corrosion behavior of LaPO4 glass solidification in bentonite, humic acid, and groundwater for spent fuel geological repositories

Corrosion behavior of LaPO4 glass solidification in bentonite, humic acid, and groundwater for spent fuel geological repositories

An Automated Electrochemical Noise Analysis for Corrosion Type Identification Using Random Forest: Features Selection and Cross-Material Performance

Abstract Electrochemical noise has been used to monitor four materials undergoing uniform and localised corrosion and in passive conditions. The data are used to train a random forest (RF) model to classify the corrosion behaviours, achieving an accuracy of 96%, when training and testing the model with all materials and conditions. Key features, including current standard deviation and peak to peak difference, were identified as critical to obtain an accurate classification. The RF model was also trained on single metals and cross-validated on the others. The accuracy in the classification was generally maintained for similar materials, but decreased slightly for training and validation on significantly different materials.

Optimization of FSW input parameters for dissimilar butt-welded joints of Al6061-AZ31 alloys by GRA

In this paper, the optimization of Friction Stir Welding (FSW) parameters used to produce dissimilar non-ferrous butt joints of Al6061 and AZ31 alloys is investigated carefully. FSW parameters including tool rotation speeds (TRS) ranging between 700–1100 rpm, traverse speed (TS) 40–80 mm/min, and axial load (LA) 7–11 KN are considered for finding suitable FSW parameters. The experiments are carried out at different combinations of FSW parameters and the results are measured using respective equipment. The L18 orthogonal array of Taguchi design of experiments is adapted for Grey relation analysis (GRA) multi-objective optimization aiming for high tensile strength and less wear rate with measured responses. Based on grey relational grade, TRS, TS, and axial load of 1100 rpm, 60 mm/min, 9KN are found to best suitable FSW parameters with reasonable tensile strength of 132.43 MPa, microhardness of 70.4 Hv, and lower wear rate of 5.156 mm3/m, respectively. The confirmatory test has been performed to verify the finding of the optimization study with a maximum error percentage of 2%. Furthermore, the corrosion analysis has also been performed for the produced FSW butt joint at a suitable parametric combination. Corrosion behavior is improved due to equiaxed grain distribution and formed hard Mg2Si precipitates that reduce the differential dissolution effect when embedded in Al matrix. It signifies the improvement in chemical inertness in application to extreme temperature environments.

Corrosion and degradation behavior of MCSTE-Processed AZ31 magnesium alloy

This study aims to investigate the impact of multi-channel spiral twist extrusion (MCSTE) on the corrosion and degradation properties of biodegradable AZ31 (Mg-3Al-1Zn, wt.%) magnesium alloy. Square AZ31 billets were processed using route C-MCSTE (with a 180° rotation between passes) at 250°C and with a ram speed of 10 mm/min for up to 8 passes. The extrusion process was conducted via dies with twist angles of 30° and 40°. The microstructural changes and grain size distribution in the alloy were determined with a Scanning Electron Microscopy equipped with Electron Backscatter Diffraction. Electrochemical tests were conducted in a simulated body fluid to model the environment in which medical implants operate. The mechanical properties of the alloy were tested before and after processing using compression tests. The billets processed with a 30° twist angle demonstrated superior mechanical and corrosion resistance compared to those processed with a 40° die. A 66% reduction in grain size was found in billets processed for 4 passes using the 30°-die as compared to the as-annealed condition. Billets processed for 4 and 8 passes showed ultimate compressive strength improvements of 23% and 31%, respectively compared to the as-annealed condition. The 8-pass processed sample using the 30° twist ring die showed 76% improvement in the corrosion rate compared to the as-annealed state. Furthermore, billets processed for 4 passes showed corrosion resistance and ultimate compressive strength improvements of 108% and 23%; respectively compared to the as-annealed condition. These findings imply that the developed MCSTE process can be adopted for industrial use, especially in the manufacturing of biodegradable magnesium alloys for medical implants.

Influence of Electrolyte Additives on the Corrosion Behavior of Current Collectors for Lithium-Sulfur Batteries

Influence of Electrolyte Additives on the Corrosion Behavior of Current Collectors for Lithium-Sulfur Batteries

Corrosion Behavior of Ti6Al4V/Al2O3 Vacuum Brazed Joints with Ag-Cu Eutectic Filler

Corrosion Behavior of Ti6Al4V/Al2O3 Vacuum Brazed Joints with Ag-Cu Eutectic Filler

Cold-Drawn Wood-Filled Polybutylene Succinate Macro-Fibers as a Reinforcing Material for Concrete

The corrosive behavior of steel reinforcements causes issues in the concrete industry. To overcome this issue, alternative noncorrosive reinforcements such as polymer fibers could be used. However, as environmental protection becomes more important, sustainability must also be considered in the solution. An alternative to polymers based on raw oil is bio-based polymers. This study investigates the suitability of polymer fibers produced from polybutylene succinate together with cellulose and wood fillers as concrete reinforcements. Different mixtures of polybutylene succinate, cellulose, and wood fillers were created, and fibers were produced using a multiple drawing process. The fibers were tested using tensile tests, a single-fiber pull-out test, contact angle measurements, reflected light microscopy, density measurements, and thermogravimetric analysis. The fillers were shown to decrease the mechanical properties as the particle size and filler amount increased, resulting in a reduction in Young’s modulus and tensile strength of 55% and 70%, respectively, while adhesion to concrete increased with particle size from 0.31 ± 0.02 N/mm2 without filler to 0.90 ± 0.10 N/mm2 for the best-performing material combination. Reflected light microscopy images show changes in the fiber surface before and after pull-out. The fiber density decreased from 1.26 ± 0.05 g/cm3 to 0.91 ± 0.04 g/cm3 with an increasing filler amount and particle size for a compound with 10 weight percent of wood filler 1. The fiber thermal stability decreased slightly with the addition of filler. The greatest effect was a reduction in the temperature to ≈58 °C at 1% weight loss when 10 weight percent of wood was added. This study proves the possibility of using bio-based materials as concrete reinforcements.

Corrosion Effects on Bond Degradation and Cracking Patterns in Lapped Spliced Joints of Reinforced Concrete

This research study aims to enhance the understanding of corrosion behaviour in lapped spliced joints within reinforced concrete structures. Specifically, the effect of corrosion on bond degradation and crack formation is investigated. Accelerated corrosion tests were conducted on two sets of semi-cylindrical samples and half-beam blocks. By applying a constant voltage, the current-time relationship during the corrosion process was obtained. Subsequently, the samples were subjected to pull-out testing to assess their bond strength. Three primary modes of bond failure were observed: pull-out, splitting, or a combination of both. Notably, the results demonstrate that the reduction in bond strength is directly related to the corrosion level, considering factors such as mass loss, section loss, and diameter reduction. Furthermore, a strong correlation exists between corrosion-induced cracks and the weakening of bond strength. These findings align with existing research and enrich the experimental data in the current corrosion database for lap splice joints in reinforced concrete structures.

Effect of High Temperature on the Corrosion Behavior and Passive Film Composition of 316L Stainless Steel in Concentrated NaOH Solution

Corrosion resistance to high temperature concentrated alkali solutions (>20 wt%) is very important for 316 L austenitic stainless steel (316 L SS). In this study, the effect of high temperature (130 °C) on the corrosion behavior and passive film composition of 316 L SS in 50 wt% NaOH solution was investigated by electrochemical methods, XPS, and AES. The results indicated that the corrosion resistance of passive films was significantly affected by temperature. When the temperature was increased from 40 °C to 130 °C, the passive current density increased by two orders of magnitude, and the number of film defects wer significantly increased as well. AES results showed that as the temperature increased from 40 °C to 130 °C, the passive film shifted from selective dissolution of Fe to dissolution of both Fe and Cr. The composition of the passive film shifted from being Cr-rich to Ni-rich. The outer layer of passive film on 316 L SS was mainly composed of Cr2O3, Cr(OH)3, FeCr2O4, NiO, Fe3O4, FeO, Fe2O3, and FeOOH at 40 °C, and was converted to Fe3O4, FeO, Fe2O3, FeOOH, Ni(OH)2, and NiFe2O4 at 130 °C. Additionally, Ni oxides and hydroxides exhibited excellent stability in the high-temperature concentrated NaOH solution.

Al content regulation of microstructure, wear resistance, and corrosion behavior in Mo0.5NbTiZrAlx high-entropy alloys

Al content regulation of microstructure, wear resistance, and corrosion behavior in Mo0.5NbTiZrAlx high-entropy alloys

Investigating the Effect of Thickener Concentrations on the Corrosion Behavior of Pure Mg.

Magnesium (Mg) and its alloys are promising biodegradable implant materials due to their biocompatibility and ease of corrosion in physiological environment. In the tissue, diffusion of ions and gas released by Mg corrosion reaction will be interfered by extracellular matrix and cells, which may retard the corrosion reaction. Therefore, in the present study, we developed the in vitro model tissue with different diffusion rates to understand the effect of diffusion on the Mg corrosion. A thickener called gellan gum was added to the cell culture medium at appropriate concentrations to simulate tissues with different diffusion rates. The immersion study up to 28 days and the electrochemical studies were performed to evaluate the Mg corrosion behavior. The pure Mg specimens without thickener showed the highest corrosion rate in both immersion and electrochemical tests. The highest amount of insoluble salt layer with the lowest Mg and highest O concentrations were deposited on the specimen surface without thickener. The microfocus X-ray computed tomography (μCT) analysis confirmed these findings, showing the lowest remaining volume for specimens without thickener. There is an impediment of ion diffusion in the model tissue with increased thickener concentrations, thereby decreasing the corrosion rate. The corrosion rate for 0.2-0.3 wt. % thickener matched in the range of reported in vivo results. Hence, this model proves to be an effective tool for investigating biodegradation and understanding the mechanisms and controlling factors of this phenomenon.

Influence of the mechanical activation process on the corrosion of Ti2⁠AlN MAX phase obtained by hot pressing

Influence of the mechanical activation process on the corrosion of Ti2⁠AlN MAX phase obtained by hot pressing

Corrosion behaviour and mechanism of high-velocity-arc-sprayed Fe-based amorphous coating in 3.5 % NaCl solution

Corrosion behaviour and mechanism of high-velocity-arc-sprayed Fe-based amorphous coating in 3.5 % NaCl solution

Corrosion behavior and cytocompatibility of recast high-gold dental bonding alloys pre-treated with white fused alumina air-abrasion

Corrosion behavior and cytocompatibility of recast high-gold dental bonding alloys pre-treated with white fused alumina air-abrasion

Wear properties, corrosion behaviors, and TEM structures of CrSiN/CrSi multilayer coatings on oxynitriding-treated Unimax tool steel using the direct current magnetron sputtering system

Wear properties, corrosion behaviors, and TEM structures of CrSiN/CrSi multilayer coatings on oxynitriding-treated Unimax tool steel using the direct current magnetron sputtering system

Insights into the high-temperature oxidation and electrochemical corrosion behavior of Si alloyed TiAl alloys and the prediction of corrosion behavior using machine learning approaches

Insights into the high-temperature oxidation and electrochemical corrosion behavior of Si alloyed TiAl alloys and the prediction of corrosion behavior using machine learning approaches