首页期刊导航|Corrosion science: The Journal on Environmental Degradation of Materials and its Control
期刊信息/Journal information
Corrosion science: The Journal on Environmental Degradation of Materials and its Control
Pergamon Press
Pergamon Press
月刊
0010-938X
Corrosion science: The Journal on Environmental Degradation of Materials and its Control/Journal Corrosion science: The Journal on Environmental Degradation of Materials and its ControlSCIISTPAHCI
查看更多>>摘要：Deformation-induced coating damage during surgery and service has always been difficult for surface-treated magnesium (Mg) implants. Recently, self-healing coatings have been increasingly developed for biomedical magnesium applications, presenting a promising approach to address this issue. However, the behavior of coating damage caused by deformation and its following effects on the coating availability is ambiguous. In this work, dicalcium phosphate dihydrate (DCPD) coating was applied as a self-healing agent on the bare and micro-arc oxidation (MAO)-coated Mg-2Zn (wt%) wires with a diameter of about 300 mu m. After these wires were bent to 90 degrees, their coatings were damaged in various degrees by peeling and cracking on their concave and convex sides, respectively. Compared to coatings before deformation, the corrosion inhibition of these damaged coatings in Hanks' balanced salt solution (HBSS) decreased significantly. The corrosion resistance of deformed MAOcoated and MAO&DCPD (M&D)-coated wires increased with prolonged immersion time at the early corrosion stage, while that of the DCPD-coated wire remained stable. The long-term immersion results showed that the M&D-coated wire had the lowest corrosion rate. DCPD could exhibit its self-healing ability on the MAO-coated Mg wire during immersion but not on the bare wire. Given the good biocompatibility of wires after DCPD treatment, this dual-layered M&D coating is more suitable for Mg implants under deformation than the MAO coating or DCPD coating alone. Additionally, the poor performance of DCPD-coated Mg wire suggests the damage and anti-corrosive behavior of coatings on Mg after deformation differ markedly from those observed in existing scratch experiments.
查看更多>>摘要：The grain boundary engineering of 316 L SS was carried out by cold rolling and annealing. The microstructure was analyzed by EBSD, and the corrosion behavior was studied by electrochemical test, immersion and acid electrolytic corrosions. The results showed that the proportion of the low-Sigma coincidence site lattice (CSL) boundaries in the sample via 60 % cold rolling deformation and annealing at 1050 degrees C for 50 min increases to 58.04 %, with the Sigma 3 accounting for 91.49 % of the total low-Sigma CSL boundary. In terms of corrosion properties, this sample has larger total polarization resistance (97,247 Omega/cm2). The improved corrosion resistance is attributed to its higher proportion of Sigma 3 grain boundaries (especially coherent Sigma 3 boundaries), and larger proportion of (J2 +J3) in the triple junction distribution. The combined effect obtained from the increase of lowenergy Sigma 3 boundaries and the interruption of the random high-angle grain boundary network is more effective in suppressing intergranular attacks. The corrosion morphology showed that the specimens with the degree of sensitization values more than 0.5 % exhibit significant intergranular corrosion, and their corrosion morphology transitioned from boundary-controlled (ditch) to surface-controlled (step) corrosion.
Sun, TingHu, ShanshanIkeuba, Alexander I.Wen, Yuying...
1.1-1.13页
查看更多>>摘要：A novel graded composite transition joint (GCTJ) between AISI 304 stainless steel and ASTM A335 P91 steel, has been demonstrated remarkablely superior creep performance compared to the conventional dissimilar metal weldment (DMW) under equivalent conditions. However, this advance is challenged by hot corrosion under salt deposition at elevated temperatures. This study investigates the hot corrosion behavior of 304&P91 GCTJ exposed to sulfate salts at 700 degrees C. Compared to the 304 steel, corrosion attacks initiate in the P91 triangle, where the dual-phase microstructure of ferrite and tempered martensite significantly influences pitting initiation. Anodic dissolution mainly occurs within the tempered martensite due to more vulnerable sites within the tempered martensite. With prolonged exposure, corrosion propagates across both phases, and the corrosion depth within the P91 triangle is related to the exposed surface area ratio between 304 and P91. Electrochemical analysis reveals the occurrence of galvanic corrosion between the 304 and P91, with a positive linear relationship between anodic dissolution current density (Ia) and the exposed surface area ratio between 304 and P91 in molten salts, further emphasizing the critical impact of this ratio on the corrosion severity in the P91 triangle. These findings underscore the importance of transition zone design optimization in mitigating localized corrosion.
查看更多>>摘要：Molten calcium-magnesium-alumino-silicates (CMAS) corrosion poses a critical challenge to the corrosion resistance of thermal barrier coatings (TBCs) in advanced turbine engines. In this work, a novel material design strategy is developed to enhance CMAS corrosion resistance by controlling the reaction-precipitated phase composition and structure through multi-component rare earth (Y/Gd/Yb) optimization. Through cationic synergy optimization, a defect-fluorite ceramic Zr3/7Y8/21Yb2/21Gd2/21O12/7 (YYbGdZO) was synthesized, demonstrating fundamentally distinct CMAS penetration resistance compared to conventional gadolinium zirconate (GZO). It was found that the CMAS penetration depth of YYbGdZO was reduced by 98 % compared to GZO after 100 h of exposure at 1400 degrees C. This improvement is attributed to the synergy of multi-rare earth elements in YYbGdZO, which selectively reacts with components in molten CMAS, forming a protective (Y,Yb,Gd)2Si2O7-apatite/rare-earth-stabilized zirconia composite barrier that significantly enhances the material's resistance to CMAS and long-term stability. This study provides a novel strategy for the optimization of materials resistant to molten sand erosion under extreme high-temperature environments.
查看更多>>摘要：Amorphous carbon (alpha-C) coatings play a critical role in enhancing the electrical conductivity, corrosion resistance, and chemical stability of stainless steel bipolar plates in proton exchange membrane fuel cells (PEMFCs). However, traditional deposition methods, such as magnetron sputtering and chemical vapor deposition, suffer from limitations including suboptimal sp2/spa ratios, high residual stress, and insufficient mechanical durability, restricting their application. This study develops Ti-doped alpha-C coatings using a combined high power impulse magnetron sputtering (HiPIMS) and pulsed DC magnetron sputtering (PDCMS) approach to overcome these challenges. By varying Ti target power (0-1 kW), the microstructure, electrical properties, corrosion resistance, and mechanical performance of the coatings were systematically investigated. Ti doping increased the sp2/ spa ratio and promoted low-resistivity carbide phase formation, reducing the interfacial contact resistance from 5.8 to 2.6 m Omega cm2 (0.6 kW). At an optimal Ti target power of 0.6 kW, the coatings achieved excellent corrosion resistance, with a corrosion current density of 0.12 mu A cm- 2. Additionally, mechanical properties were significantly enhanced, with hardness reaching 13.64 GPa and elastic recovery improving to 43 %. These findings demonstrate that Ti-doped alpha-C coatings not only address the limitations of traditional alpha-C deposition techniques but also offer a cost-effective, high-performance solution for stainless steel bipolar plates, advancing the commercialization of PEMFCs.
查看更多>>摘要：Electrochemical Impedance Spectroscopy (EIS) is a powerful quantitative technique to study metal corrosion. However, conventional EIS measurements require immersing the sample in liquid electrolytes and direct electrical connection to the metal substrate, limiting its feasibility for non-destructive testing and field use. This study introduces a novel non-invasive EIS sensor with a compact dual-compartment structure and an agar-based solid electrolyte, enabling a good fit for different surfaces and rapid measurements without sample immersion or wired contact with the substrate. The sensor's performance has been tested on bare and coated metals under laboratory conditions and compared quantitatively with conventional EIS. The reliability and repeatability of the obtained impedance spectra have been validated, and the effects of key sensor parameters and experimental settings (e.g., measurement distance, reference electrode, working electrode, and AC potential amplitude) on impedance response have been systematically investigated. In addition, appropriate experimental protocol and data processing methodology have been established. The results demonstrate that the proposed method provides highquality, analyzable impedance spectra comparable to conventional EIS after removing the contribution of the sensor's self-impedance. Impedance analysis of coated metals indicates that the current path traverses the coating interface and conducts through the metal substrate rather than solely through the coating. Furthermore, the sensor successfully determined the coating thickness consistent with the sample characteristics. This work advances indirect impedance measurements and offers a viable solution for rapid, non-invasive corrosion inspection and coating assessment.
查看更多>>摘要：Intergranular stress corrosion cracking (IGSCC) was observed in an Alloy 600 bottom-mounted instrumentation (BMI) nozzle of a French pressurised water reactor (PWR). Destructive examinations of the component revealed the presence of oxide inclusions extending along the crack, which were identified as likely to promote IGSCC initiation. In this context, the corrosion behaviour of Alloy 600 laboratory heats containing aluminium and/or magnesium oxide inclusions was investigated in primary water at 325 degrees C and 360 degrees C for oxidation times ranging from 10 h to 7000 h. Complete dissolution and/or detachment of the oxide inclusions was observed after a few hundred hours of exposure to primary water, and the presence of magnesium borate was locally detected. Furthermore, blister-like features consisting of Ni2FeBO5 filaments embedded in a double nickel chromite spinel layer were characterised on the surface of Alloy 600 in the vicinity of some alumina inclusions while, a micronthick oxide layer was formed at the former interface with the pre-existing inclusions.
查看更多>>摘要：The CoCrFeMnNi high-entropy alloy is widely regarded as one of the most promising materials for wear resistance, particularly in mitigating erosion failure in critical components of oil and gas equipment. However, its performance is significantly influenced by factors such as elemental composition and proportion. Therefore, determining the optimal parameters for preparing erosion-resistant alloys has become a significant challenge. In this study, for the first time, we establish an erosion resistance design evaluation system that integrates molecular dynamics and machine learning. This system incorporates parameters such as pressure, friction coefficient, and the number of wear atoms, and a high-performance machine learning model is trained to predict the optimal erosion-resistant coating and verify. Furthermore, to enhance the applicability of the design evaluation method, the trained machine learning model can be directly employed to guide the alloy component design under different crystal orientations and structures post-verification. The results of this study offer significant theoretical insights for the development of the optimal erosion-resistant CoCrFeMnNi high-entropy alloy for oil and gas equipment, while also substantially reducing both experimental and temporal costs.
查看更多>>摘要：The influence of aging time (1, 2, 5, and 24 h) and minor additions of Cu (<= 0.05 wt%), Zn (<= 0.06 wt%), and Cu/ Zn on the microstructure and intergranular corrosion (IGC) resistance of Al-Mg-Si alloy is investigated. Minor Cu or Zn additions negatively affect IGC resistance of these alloys. However, the findings also indicate that a Cu/Zn ratio of approximately 1.54 enhances corrosion resistance across aging conditions, which can be further improved by appropriate heat treatments. Additionally, STEM-EDS analysis indicates that Zn is less detected in grain boundaries (GBs) and intragranular precipitates compared to Cu at identical aging conditions.
查看更多>>摘要：This work systematically examined the impact of gravity on Desulfovibrio vulgaris deposition, biofilm formation, and microbiologically influenced corrosion (MIC) behavior on 90/10 copper-nickel (Cu-Ni) at different clock positions (6 P, 9 P, and 12 P). Gravity exerted a significant influence on biofilm formation and the severity of MIC on 90/10 Cu-Ni alloy. The circumferential corrosion distribution on the inner surface of alloy pipeline exhibited substantial positional variation, with the most severe corrosion occurring at 6 P. Under static incubation conditions, the D. vulgaris sessile cell count at 6 P was 28 % higher than 12 P, and the weight loss at 6 P reached 8.6 +/- 0.5 mg/cm(2), which was 1.3-fold and 1.7-fold greater than that at 9 P and 12 P, respectively. The thickness of D. vulgaris biofilm and MIC progression followed the trend: 6 P > 9 P > 12 P. Under dynamic incubation conditions, the differences in MIC across the positions diminished due to shear stress modulating the development of the D. vulgaris biofilm. Stirring mitigated gravitational effects, promoting a more uniform D. vulgaris biofilm distribution and MIC rate.
NETL
NSTL
Elsevier