马琳梦,邹忠利,许满足,刘坤.老化时间对AZ31B镁合金铁氰化钾转化膜耐蚀性的影响[J].表面技术,2022,51(1):113-120, 191.
MA Lin-meng,ZOU Zhong-li,XU Man-zu,LIU Kun.Effect of Aging Time on Corrosion Resistance of Potassium Ferricyanide Conversion Coating on AZ31B Magnesium Alloy[J].Surface Technology,2022,51(1):113-120, 191
老化时间对AZ31B镁合金铁氰化钾转化膜耐蚀性的影响
Effect of Aging Time on Corrosion Resistance of Potassium Ferricyanide Conversion Coating on AZ31B Magnesium Alloy
投稿时间:2021-03-08  修订日期:2021-04-29
DOI:10.16490/j.cnki.issn.1001-3660.2022.01.012
中文关键词:  AZ31B镁合金  化学浸渍法  铁氰化钾  转化膜  老化时间  电化学方法  耐蚀性
英文关键词:AZ31B magnesium alloy  chemical impregnation method  potassium ferricyanide  conversion coating  aging time  scanning electron microscope  electrochemical method  corrosion resistance
基金项目:北方民族大学重点科研项目(2019KJ10);宁夏自然科学基金项目(2020AAC03193);北方民族大学研究生创新项目(YCX21115)
作者单位
马琳梦 北方民族大学 材料科学与工程学院,银川 750021 
邹忠利 北方民族大学 材料科学与工程学院,银川 750021 
许满足 北方民族大学 材料科学与工程学院,银川 750021 
刘坤 北方民族大学 材料科学与工程学院,银川 750021 
AuthorInstitution
MA Lin-meng School of Materials Science and Engineering, North Minzu University, Yinchuan 750021, China 
ZOU Zhong-li School of Materials Science and Engineering, North Minzu University, Yinchuan 750021, China 
XU Man-zu School of Materials Science and Engineering, North Minzu University, Yinchuan 750021, China 
LIU Kun School of Materials Science and Engineering, North Minzu University, Yinchuan 750021, China 
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中文摘要:
      目的 在镁合金表面制备一种新型的化学转化膜,以提高其耐蚀性。方法 通过化学浸渍法,以铁氰化钾作为成膜主盐,在镁合金表面制备一层耐蚀性较好的化学转化膜,主要探究老化时间对AZ31B镁合金铁氰化钾转化膜耐蚀性的影响。利用扫描电镜(SEM)、X射线光电子能谱仪(XPS)、X射线衍射仪(XRD)和能谱仪(EDS)对膜层表面形貌及组成进行分析表征,利用电化学方法和析氢实验研究转化膜的耐蚀性能,利用浸泡实验探究膜层的寿命。结果 镁合金基体表面生成了一层具有较少裂纹的膜层,膜层厚度约为 20 μm。XPS、XRD及EDS结果表明,膜层主要成分为Fe4[Fe(CN)6]3。动电位测试结果显示,老化12 h的膜层耐蚀性最佳,相比于未经处理的镁合金试样,其自腐蚀电位正移了约1000 mV,自腐蚀电流密度下降了约3个数量级。电化学交流阻抗结果显示,老化时间为12 h的电荷转移电阻(Rct)最大,为41 380 Ω.cm2,相比于其他老化时间的试样有了显著的提升。析氢实验结果也证明,老化12 h的铁氰化钾转化膜明显提高了AZ31B镁合金的耐蚀性。结论 铁氰化钾化学转化膜可以提高镁合金的耐腐蚀性能,并且最佳老化时间为12 h,其使用寿命至少可以维持48 h。
英文摘要:
      In this paper, a new type of chemical conversion was prepared on the surface of magnesium alloy in order to improve the corrosion resistance. With the potassium ferricyanide as the main film forming material, A chemical conversion film with good corrosion resistance was prepared on the surface of magnesium alloy by chemical immersion method. The effect of aging time on corrosion resistance of potassium ferricyanide conversion coating on AZ31B magnesium alloy. The scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and energy dispersive spectrometer (EDS) were used to analyze and characterize the film surface morphology and the film composition, the electrochemical method and the hydrogen evolution experiment were used to study the corrosion resistance of conversion coating, and the immersion experiment was used to explore the life of the film. The images proved that an about 20 μm layer of film with fewer cracks was formed on the surface of the magnesium alloy substrate. XPS, XRD and EDS results showed that the main component of the film is Fe4[Fe(CN)6]3. The potentiodynamic test results proved that the 12-hour-aged film had the best corrosion resistant compared with the untreated magnesium alloy samples. Its self-corrosion potential was positively shifted by about 1000 mV, and the corrosion current density was reduced by about 3 orders of magnitude. The AC impedance spectroscopy results demonstrated that the charge transfer resistance (Rct), that is 41 380 Ω.cm2, was the largest when the aging time was 12 h, which has remarkably improved compared with the samples at different aging time. The hydrogen evolution experiment results also proved that the potassium ferricyanide conversion coating aged for 12 hours significantly improved the corrosion resistance of the AZ31B magnesium alloys. In summary, potassium ferricyanide chemical conversion film can improve the corrosion resistance of magnesium alloy, the best aging time is 12 h and its service life can be maintained at least 48 hours.
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