Surface Topography-Metrology and Properties
·
2024
·Vol. 12
·期 2
·025016
·
IF 2
Shengli Chen,Jiyuan Zhu
Rapid corrosion rate is limiting the engineering application of magnesium alloys. In this paper, an attempt was made to produce a corrosion resistant coating on the surface of AZ91D magnesium alloy using hydrothermal method. The coating surface is covered with microspheres and has a dense structure, which effectively isolates the contact between the outside world and the substrate. The corrosion potential(E) raised from −1.57 V to −0.45 V compared to the bare sample. The corrosion current density and corrosion rate of the coating can be reduced by 6 orders of magnitude, and the polarization resistance raised by 6 orders of magnitude. The thickness of the coating is 45.4 μm at the moment, with a minimum of defects on the surface, resulting in excellent corrosion resistance in the immersion test. The coating also has good adhesion strength at 4B, which can expand the application range of magnesium alloy in corrosive environments.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2018
·Vol. 43
·期 1
·430-438
·
IF 3.009
Xiuman Wang,Qian Zhang,Xiaofeng Shi,Ning Wang,Yujun Chai
Summary To analyze the effect of Co and Ni on hydrogen generation in water, the reactions of Mg and Al with water in CoCl 2 and NiCl 2 solutions are studied in terms of amount of H 2 produced and rate of reaction. Mg rapidly reacts with water in CoCl 2 and NiCl 2 , producing high amount of H 2 without induction time. While there is a short induction time is detected for Al─H 2 O reaction in CoCl 2 and NiCl 2 . In addition to the galvanic cell behavior of the Mg (Al)/Co (Ni) compounds formed, Co and Ni catalyze the hydrogen production reaction; however, the agglomeration of Co or Ni leads to a noticeable decrease in H 2 production. The open-circuit potential in CoCl 2 and NiCl 2 solutions after the addition of Mg or Al at ambient temperature shows an obvious change, coinciding with the initiation of the hydrogen generation process. Mg rapidly reacts with water in Co (Ac) 2 , CoSO 4 , Ni (Ac) 2 and NiSO 4 solutions as a consequence of its intrinsic metallic properties and of the formation of Co or Ni. The hydrogen production amount is lower (<200 ml g −1 ) in Co (NO 3 ) 2 and Ni (NO 3 ) 2 , even after adding NaCl. No reaction occurs when adding Al in CoSO 4 , Co (Ac) 2 , Co (NO 3 ) 2 , NiSO 4 , Ni (Ac) 2 , and Ni (NO 3 ) 2 . The synergistic effect of Co, Ni, and anion ions in water affects the rate of Al or Mg corrosion and hydrogen generation.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Chun Bai,Shuxian Liu,Fenghai Ma,Shasha Lu,Junmei Wang,Shaodong Liu
As a new structural building material, carbon fiber-reinforced concrete has very good flexural strength, wear resistance and impermeability. However, because carbon fiber is a good conductor, the durability of reinforced concrete structures may be affected if it comes into contact with steel bars in the concrete, thus allowing the formation of a galvanic couple. In this paper, electrochemical tests and corrosion weightlessness experiments were carried out in a pore fluid of concrete with a pH of 12.5. The results showed that when carbon fiber was coupled with carbon steel, the double layer capacitance (C dl ) increased and the charge transfer resistance (R ct ) decreased. The thickness of the passivation film decreased, and the protective performance of the passivation film on the carbon steel decreased. Moreover, the corrosion potential of the carbon steel increased, the corrosion current density increased, and the corrosion rate of the carbon steel increased. An XPS analysis confirmed the results of the electrochemical experiments. After carbon fiber coupling, the ratio of Fe 3+ /Fe 2+ on the surface of the carbon steel decreased, and the stability of the passive film on the surface of the carbon steel decreased. Although coupling with carbon fiber had a negative effect on the passivation of the carbon steel, the surface of the carbon steel could still maintain good passivation in a chloride-free simulated pore fluid environment.
研究领域:
土木工程
·
材料科学
✓ 已验证
DOI
高影响因子
CORROSION SCIENCE
·
2020
·
IF 6.479
Yang Du,Mingyin Kou,Jiguo Tu,Mingyong Wang,Shuqiang Jiao
The electrochemical behavior of TiB 2 anode is investigated in the present work in order to obtain the anodic behavior in molten CaCl 2 -CaO. The work reveals that the passivation film is generated on the surface of TiB 2 anode during the anodic polarization process, leading to a higher pitting potential than that of the Pt electrode. After 100 h potentiostatic electrolysis, the TiB 2 anode shows a corrosion rate as low as 1.38 × 10 -3 g cm -2 h -1 . The formation mechanism of the TiB 2 anode passivation film after electrolysis is determined as TiB 2 + O 2- → Ti(BO 3 ) + O 2- → TiO 2 + CaO → CaTiO 3 .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2025
·
IF 11
Qi Liu-Jie,Zhang Zhao-Qi,Iqbal Mujahid,Wang Fei,Li Jing-An,Guan Shao-Kang
Drug-eluting magnesium (Mg) alloy stents have a slower degradation rate and lower restenosis rate compared with uncoated stents, demonstrating good clinical efficacy. However, the release of anti-hyperplasia drugs from coatings delays endothelial tissue repair, thus leading to late stent thrombosis. To address these issues, a dual self-healed coating with various biological properties was fabricated on magnesium fluoride/polydopamine (MgF 2 /PDA)-treated Mg alloys by spraying-assisted layer-by-layer (LBL) self-assembly of chitosan (CS), gallic acid (GA), and 3-aminobenzeneboronic acid-modified hyaluronic acid (HA-ABBA). The LBL coating, approximately 1.50 μm thick, exhibited a uniform morphology with good adhesion strength (~ 1065 mN). The annual corrosion rate ( P i ) of LBL samples was ~ 1400 times slower than that of the Mg substrate, due to the physical barrier function provided by MgF 2 /PDA layers and the dual self-healed ability of LBL layers. The rapid self-healing ability (with a healing period of ~ 4 h under dynamic/static conditions) resulted from the synergistic interplay between the recombination of diverse chemical bonds within the LBL coating and the coordination of LBL-released GA with Mg 2+ , as corroborated by computer simulations. Compared with the drug-eluting coatings, the LBL sample demonstrated substantial advantages in anti-oxidation, anti-denaturation of fibrinogen, anti-platelet adhesion, anti-inflammation, anti-hyperplasia, and promoted-endothelialization. These benefits effectively address the limitations associated with drug-eluting coatings. Graphical abstract
研究领域:
生物材料学
·
医学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Huanghua Zhang,Yuming Zhao,Jinhui Liu,Jilei Xu,Dong Guo,Chenxu Li,Xianghong Zhou,Peixu Yang,Shaojun Zhang
The corrosion behavior of Mg-7Nd and Mg-10Y binary alloys were investigated through scanning electron microscope observation, hydrogen evolution, weight loss experiment and electrochemical test. It was found that the corrosion rates of two alloys are mainly influenced by the micro-galvanic corrosion between the second phase and α-Mg matrix, and the second phases (Mg 12 Nd and Mg 24 Y 5 ) have a higher activity than α-Mg matrix and act as an anode to corrode preferentially during the micro-galvanic corrosion process. Mg-7Nd alloy has a faster corrosion rate than Mg-10Y alloy due to the fact that it contains more second phase and the second phase containing Nd elements is more reactive. The different distribution of rare earth elements in the alloy can lead to different corrosion morphology.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
Acta Biomaterialia
·
2017
·
IF 6.319
Qiuyue Yang,Wei Yuan,Xiangmei Liu,Yufeng Zheng,Zhenduo Cui,Xianjin Yang,Haobo Pan,Shuilin Wu
The biodegradability and good mechanical property of magnesium alloys make them potential biomedical materials . However, their rapid corrosion rate in the human body’s environment impairs these advantages and limits their clinical use. In this work, a compact zirconia (ZrO 2 ) nanofilm was fabricated on the surface of a magnesium-strontium (Mg-Sr) alloy by the atomic layer deposition (ALD) method, which can regulate the thickness of the film precisely and thus also control the corrosion rate. Corrosion tests reveal that the ZrO 2 film can effectively reduce the corrosion rate of Mg-Sr alloys that is closely related to the thickness of the film. The cell culture test shows that this kind of ZrO 2 film can also enhance the activity and adhesion of osteoblasts on the surfaces of Mg-Sr alloys. Statement of Significance The significance of the current work is to develop a zirconia nanofilm on biomedical MgSr alloy with controllable thickness precisely through atomic layer deposition technique. By adjusting the thickness of nanofilm, the corrosion rate of Mg-Sr alloy can be modulated, thereafter, the degradation rate of Mg-based alloys can be controlled precisely according to actual clinical requirement. In addition, this zirconia nanofilm modified Mg-Sr alloys show excellent biocompatibility than the bare samples. Hence, this work provides a new surface strategy to control the degradation rate while improving the biocompatibility of substrates.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
ACS Omega
·
2021
·
IF 3.512
Bianli Quan,Junqi Li,Chaoyi Chen
This study investigates the effect of corrosion temperature on the corrosion of Q235 steel and 16Mn steel in the sodium aluminate solution using the weight loss method and electrochemical method. The results indicate that the corrosion rates of two steels show an increasing trend with the temperature and that of Q235 steel increases more than that of 16Mn steel at higher temperatures. The corrosion products have changed from four forms at 25 °C to two forms at 65 and 110 °C, namely, the octahedral particles and the bulk particles formed by the flocculent aggregation. The corrosion products are composed of FeS, FeS2, Fe2O3, Fe3O4, NaFeO2, and Al2O3. The Icorr of the two steels increases with temperature, while Rp gradually decreases. The two steels are controlled by the charge transfer at 25 and 65 °C and the charge transfer and the ion diffusion at 95 °C, indicating that the temperature changes the kinetics of the corrosion process.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Applied Sciences-Basel
·
2020
·Vol. 10
·期 7
·2487
·
IF 2.474
Cijun Shuai,Yulong Li,Fang Deng,Youwen Yang,Shuping Peng,Fangwei Qi,Lida Shen
Iron (Fe) has attracted intensive attention as a bone implant material because of its inherent biodegradability, favorable biocompatibility and mechanical properties. Nevertheless, it degrades too slowly in a physiological environment, which limits its further clinical application. In this work, mesoporous carbon (MC) was introduced into Fe bone implant manufactured via a laser-additive manufacturing process. Particularly, MC possesses a noble standard corrosion potential and excellent electrical conductivity, thus acting as an effective cathode and activating micro-galvanic corrosion in the Fe matrix. More importantly, its high specific surface area enhanced the area ratio between cathode and anode, which further enhanced the galvanic corrosion effect. As a consequence, the corrosion rate was enhanced from 0.09 to 0.24 mm/year based on immersion tests. Besides, Fe/MC composite exhibited good cytocompatibility, as well as excellent mechanical properties. The positive results proved that the Fe/MC composite shows great potential as a bone implant.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
DOI
高影响因子
Surface Topography-Metrology and Properties
·
2022
·Vol. 10
·期 1
·015039
·
IF 2.185
Xiaolin Li,Gang Kong,Jingwen Zhang,Delin Lai,Chunshan Che,Bo Yang,Shuanghong Zhang,Jiayu Gu
Conductive metals can speed up the self-assembly and reduction process of graphene oxide (GO) in liquid media, but there is little available information about the effect of this process on the corrosion rate of metal substrates. The corrosion performance of Q235 steel in GO aqueous solution was studied by comparing the influence of different GO concentrations and immersion times on the corrosion rate of steel. The result found that a GO layer will be formed on the surface of steel when immersing in the GO aqueous dispersion, which has a shielding effect on the diffusion process of ions and electrons, and effectively inhibits the steel corrosion. However, this inhibition effect of GO layer will disappear with the self-reduction of GO, which increasing the defect density and conductivity of the sedimentary layer on steel and thus the corrosion rate of steel will increase with the immersion time and the GO concentration in solution.
研究领域:
材料科学
·
腐蚀工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Mingcheng Feng,Qingyun Fu,Jian Li,Jingyao Li,Qiong Wang,Xiangning Liu,Weihong Jin,Wei Li,Paul K. Chu,Zhentao Yu
Fast degradation of magnesium (Mg) and its alloys in the physiological environment has impeded their clinical use as temporary implants. To control degradation of Mg in the physiological environment, a sodium alginate coating is fabricated on alkalinized high-purity Mg with a silane transition layer by spin coating . The surface morphology and composition are investigated by scanning electron microscopy, energy-dispersive X-ray spectrometry , X-ray diffraction, and Fourier transform infrared spectroscopy . Electrochemical and immersion tests are performed in the simulated body fluid (SBF) at 37 °C. The composite coating with a thickness of 10.3 µm is uniform and adheres well to the Mg substrate. Compared to the bare substrate, the corrosion current density of the sample with the composite coating decreases from 130.9 ± 6.2–1.3 ± 0.3 μA cm −2 and the charge transfer resistance increases by 190 times. The average degradation rate in SBF drops to 0.80 ± 0.26 mm year −1 from 3.47 ± 0.25 mm year −1 of the pristine Mg substrate and the composite coating is demonstrated to impede corrosion of the Mg substrate after immersion in SBF for 14 days. The excellent protection rendered by the composite coating is ascribed to the effective barrier effects of the dense and adhering sodium alginate coating and blocking effect of chelate compounds of sodium alginate and Mg ions formed during the corrosion process.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yinze Zuo,Liang Chen,Yu Wang,Yunxia Guo,Xingling Shi,Yanmin Gao
Pre-processing of a metal surface before coating is a key factor that affects the coating performance. This phenomenon has been puzzling people for a long time. In this paper, a new type of preprocessing using heterocyclic compounds, pyridine and furan, were applied to address this problem. The tests show that the rust layers of mild steel treated by pyridine and furan are more compact than the untreated layers. The corrosion rate of the mild steel with a rust layer treated by pyridine is lower than that of the samples with furan treatment and without treatment, while the impedance is also the largest. The adhesion of an epoxy-polyvinylbutyral (EP-PVB) coating, which is painted on rust layers with pyridine and furan pretreatment, is much stronger. Moreover, the corrosion resistance of EP-PVB coatings that are painted onto the rust layers with pretreatment is much better than that of the coatings that are directly painted onto the rust layer without pretreatment. The impedance of EP-PVB coatings that are painted onto the rust layers with pretreatment is much higher than that of the EP-PVB coating that is directly painted onto the rust layer without pretreatment.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）