Study of the passivation and repassivation behavior of pure titanium in 3.5 wt% NaCl solution and 6 M HNO3 solution

Chen, Qiqian; Xu, Yanting; Ma, Aili; Zhang, Lianmin; Zheng, Yugui

doi:10.1016/j.corsci.2023.111538

Cited by 16 publications

(3 citation statements)

References 69 publications

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“…With the synergy of cyclic loading and corrosive medium for a long time, the passive film on the sample surface is finely broken in the local area. Chloride ions (Cl − ) could pass through the broken passive film and make electrochemical corrosion occur with the exposed titanium matrix [27,43], where they could form an anodic dissolution [42] and produce corrosion products. Then, the passive film is further destroyed and is unable to be repaired in time [6,44], which exposes a fresher titanium matrix to the corrosive medium.…”

Section: Discussionmentioning

confidence: 99%

Low-Cycle Corrosion Fatigue Deformation Mechanism for an α+β Ti-6Al-4V-0.55Fe Alloy

Sun,

Qian,

Chang

et al. 2024

Metals

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Titanium alloys with high strength and good corrosion resistance have become one of the critical bearing structural materials in marine engineering. But in service, corrosion fatigue would occur under the synergetic action of cyclic external load and corrosion environment, threatening the safety of components. In this study, compared with low-cycle fatigue in laboratory air, the low-cycle corrosion fatigue deformation mechanism and fracture characteristic of the Ti-6Al-4V-0.55Fe alloy were investigated in 3.5% NaCl corrosion solution under selected stress amplitudes. The results showed that under low stress amplitude, corrosion fatigue was determined by fatigue damage and corrosion damage, causing a reduction in fatigue life. The local stress concentration caused by corrosion pits and dislocations pile-up accelerated the initiation of fatigue cracks, and other corrosion behavior including crevice corrosion promoted fatigue crack propagation; the corrosion solution increased the surface damage. While under high stress amplitude, due to the short contact time between the sample and solution and higher applied stress, the fatigue life is determined by fatigue damage caused by multiple slips.

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Section: Discussionmentioning

confidence: 99%

Low-Cycle Corrosion Fatigue Deformation Mechanism for an α+β Ti-6Al-4V-0.55Fe Alloy

Sun,

Qian,

Chang

et al. 2024

Metals

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“…Furthermore, a large amount of slip and twinning occurred after deformation, the emergence of slip bands increased the cathodic reactions [40], and repassivation became much slower after the passive film breakdown because it was inhibited by the dislocations [41,42]. Further, the acidic environment accelerated the cathodic process and promoted the dissolution/formation dynamic equilibrium of the passive film [43], and the diffusion coefficient and donor density of the passivation film increased, resulting in higher activity of the passivation film. Therefore, when coupled with acidic environments and stress, the corrosion resistance of the sample was further compromised.…”

Section: Sample Ph Ocp (V)mentioning

confidence: 99%

Effect of Plastic Deformation and Acidic Solution on the Corrosion Behavior of Ti-6Al-4V ELI Titanium Alloy

Zheng,

Xu,

Cai

et al. 2023

Metals

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This study investigated the tensile deformation of Ti-6Al-4V ELI titanium alloy and its effect on corrosion performance. The results showed that the structural morphology of the samples’ strain levels of 0%, 5%, and 10% had minimal changes under an optical microscope. Further investigation of grain orientation information was conducted using electron backscatter diffraction (EBSD), revealing that tensile deformation induced grain rotation, resulting in the diversity of originally preferred orientation grains and a decrease in texture strength. A small amount of {10–12}<−1011> extension twinning formed during the tensile deformation process. The electrochemical properties of Ti-6Al-4V ELI samples with different strain levels were evaluated in 3.5% NaCl solution with pH values of 7 and 1.5. The results indicated that both plastic deformation and acidic environments were detrimental to the passivation film on the titanium alloy surface, leading to reduced corrosion resistance.

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“…Nitric acid is utilized for etching sapphire or LEDs to create microstructures, potentially associated with the need for specific surface structures in the process [20][21]. Overall, the application of these acidic solutions encompasses multiple processing steps, including oxide removal, surface roughening, and microstructure generation [22][23][24]. Compared with large-scale LEDs, miniature LEDs have a high surface area-to-volume ratio.…”

mentioning

confidence: 99%

Improved Performance of AlGaInP Red Micro Light-Emitting Diodes by Sidewall Treatments of Citric Acid

Wang,

Ye,

Yang

et al. 2024

IEEE Photonics J.

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The efficiency of AlGaInP micro light-emitting diodes (micro-LEDs) was far weaker than that of GaNbased micro-LEDs in structure and performance. Consequently, there was an urgent demand to enhance their efficiency. In this study, a citric acid treatment strategy is proposed to improve the efficiency of red micro-LEDs, and the etching uniformity of different concentrations was first confirmed. We optimized the concentration of citric acid to 1:1 and modulated the wet etching time at 0, 30, 60, 90, and 120 s to treat the sidewalls of devices. Under an injection current density of 68 nA/cm 2 , the forward voltage (Vf) of micro-LEDs after soaking in citric acid ranged from 1.40 to 1.45 V. Compared with the sample operated at the forward voltage without citric acid sidewall treatment, AlGaInP micro-LEDs displayed significantly enhanced forward voltage. This indicates that citric acid effectively removed N-GaAs without damaging the electrical properties of the devices. Among all citric acid-treated micro-LEDs, the sample with a 60 s wet etching process showed the best improvement, with the light output power and external quantum efficiency (EQE) increased by 31.08% and 5.4%, respectively. Our proposed method to treat AlGaInP micro-LEDs presents promising opportunities for the future development of high-performance optoelectronics.

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Study of the passivation and repassivation behavior of pure titanium in 3.5 wt% NaCl solution and 6 M HNO3 solution

Cited by 16 publications

References 69 publications

Low-Cycle Corrosion Fatigue Deformation Mechanism for an α+β Ti-6Al-4V-0.55Fe Alloy

Low-Cycle Corrosion Fatigue Deformation Mechanism for an α+β Ti-6Al-4V-0.55Fe Alloy

Effect of Plastic Deformation and Acidic Solution on the Corrosion Behavior of Ti-6Al-4V ELI Titanium Alloy

Improved Performance of AlGaInP Red Micro Light-Emitting Diodes by Sidewall Treatments of Citric Acid

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