石墨烯掺杂对镁锂合金微弧氧化膜Cl~-腐蚀敏感性的研究
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摘要
为了研究添加石墨烯后镁锂合金微弧氧化膜在不同NaCl浓度下的腐蚀行为,通过向硅酸盐体系电解液中添加石墨烯,在镁锂合金表面制备出改性的MAO(Micro-arc oxidation)膜层,采用电化学极化曲线和阻抗谱方法研究改性膜层对NaCl溶液的腐蚀敏感性。结果表明:石墨烯的添加可有效改善由于微弧放电形成的孔洞及微裂纹等缺陷,提高膜层致密性和耐蚀性;改性的MAO膜层耐腐蚀性能随着NaCl溶液浓度的升高而降低,主要因为在较高的浓度梯度作用下,侵蚀性离子向膜层中扩散速率加快,进而加速了对MAO膜层的腐蚀破坏。
In order to find out the effect of graphene on the corrosion sensitivity of micro-arc oxidation(MAO) film of magnesium-lithium alloys, a modified MAO film was prepared on the surface of magnesium-lithium alloy by adding graphene to the electrolyte of silicate system. The electrochemical susceptibility of the modified film in NaCl solution of different concentration was studied by electrochemical polarization and electrochemical impedance spectrum methods. The results show that the addition of graphene can effectively improve the pores, micro-cracks and other defects due to micro-arc discharge, and improve the film density and corrosion resistance. The corrosion resistance of the modified MAO film decreases with the concentration of NaCl solution increasing. It is mainly due to the accelerated diffusion of aggressive ions into the film under the action of higher concentration gradient,accelerating the corrosion of the MAO film.
In order to find out the effect of graphene on the corrosion sensitivity of micro-arc oxidation(MAO) film of magnesium-lithium alloys, a modified MAO film was prepared on the surface of magnesium-lithium alloy by adding graphene to the electrolyte of silicate system. The electrochemical susceptibility of the modified film in NaCl solution of different concentration was studied by electrochemical polarization and electrochemical impedance spectrum methods. The results show that the addition of graphene can effectively improve the pores, micro-cracks and other defects due to micro-arc discharge, and improve the film density and corrosion resistance. The corrosion resistance of the modified MAO film decreases with the concentration of NaCl solution increasing. It is mainly due to the accelerated diffusion of aggressive ions into the film under the action of higher concentration gradient,accelerating the corrosion of the MAO film.
引文
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[4]Li Z J,Yuan Y,Jing X Y. Composite coatings prepared bycombined plasma electrolytic oxidation and chemical conversion routes on magnesium-lithium alloy[J].Journal of Alloy and Compounds,2017,706:419–429.
[5]Zhang L H,Zou Y,Wang H T,et al. Surface nanocrystallization of Mg-3 wt.%Li-6 wt.%Al alloy by surface mechanical attrition treatment[J]. Materials Characterization,2016,120:124–128.
[6]Zeng R C,Sun X X,Song Y W,et al. Influence of solution temperature on corrosion resistance of Zn-Ca phosphate conversion coating on biomedical Mg-Li-Ca alloys[J].Transactions of Nonferrous Metals Society of China,2013,23(11):3293–3299.
[7]Zhang H,Yao G C,Wang S L,et al. A chrome-free conversion coating for magnesium-lithium alloy by a phosphate-permanganate solution[J].Surface and Coatings Technology,2008,202(9):1825–1830.
[8]Chen S S,Tu J X,Hu Q,et al. Corrosion resistance and in vitro bioactivity of Si-Containing coating prepared on a biode-gradable MgZn-Ca bulk metallic glass by micro-arc oxidation[J].Journal of Non-Crystalline Solids,2017,456:125–131.
[9]Dou J H,Gu G C,Chen C Z. Effects of calcium salts on microstructure and corrosion behavior of micro-arc oxidation coating on Mg-2Zn-1Ca-0.8Mn alloy[J]. Materials Letters,2017,196:42–45.
[10]Yan M Y,Sun F,Liu X P,et al. Effects of graphite content and compaction pressure on hydrogen desorption properties of Mg(NH2)2-2LiH based tank[J]. Journal of Alloys and Compounds,2015,628:63–67.
[11]Furlan K,Goncalves P D C,Ceise D R,et al. Metallurgical aspects of self-lubricating composites containing graphite and MoS2[J].Journal of Maertials Engineering and Performance,2017,26(3):1135–1145.
[12]Wang Z,Zhao Q Y,Jing L,et al. Corrosion behavior of ZrB2-SiCGraphite ceramic in strong alkali and strong acid solutions[J].Ceramics International,2016,42(2):2926–2932.
[13]Mukhopadhyay S,Mondal C,Chakraborty A,et al. In depth studies on cementitious nanocotings on graphite for its contribution in corrosion resistance of alumina based refractory composite[J]. Ceramics International,2015,41:11999–12010.
[14]Sure J,Mallika C,Choubey A,et al. Corrosion behavior of laser melted alumina-40wt%Titania coated high density graphite in molten salt[J].Transactions of the Indian Institute of Metals,2016,69(9):1633–1644.
[15]Huang Z W,Luo Z G,Gao X N,et al. Investigations on the thermal stability,long-term reliability of LiNO3/KCl-expanded graphite composite as industrial waste heat storage material and its corrosion properties with metals[J]. Applied Energy,2017,188:521–528.
[16]胡增荣,童国权,张超.石墨烯-镍纳米复合材料的制备及性能[J].材料热处理学报,2016,37(1):56–60.
[17]张玉林,于佩航,冯作菊,等.石墨烯添加剂对微弧氧化陶瓷层耐蚀性能的影响[J].材料热处理学报,2017,38(2):158–163.
[18]Benka S G. Two-dimensional atomic crystals[J]. Physics Today,2005,58(9):9.
[19]Yan Y Y,Han Y,Li D C,et al. Effect of NaAlO2 concentrations on microstructure and corrosion resistance of Al2O3/ZrO2coatings formed on zirconium by micro-arc oxidation[J].Applied Surface Science,2010,256(21):6359–6366.
[20]Ma K J,Al Bosta M M S,Wu W T. Preparation of self-lubricating composite coatings through a micro-arc plasma oxidation with graphite in electrolyte solution[J].Surface and CoatingsTechnology,2014,259:318–324.
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