CAJ | 학술논문

研究了一种新的AZ31B镁合金交流电微弧氧化(MAO)工艺,采用了对环境更加友好的含硅酸盐的稀碱溶液作为电解质.结果发现氧化过程分为2个阶段,膜厚与微弧氧化时间呈抛物线关系.形貌观察表明,微弧氧化膜由一个致密层和一个多孔层组成.致密层的厚度约占整个膜厚的40％,膜表面的20％均匀分布着直径1 ～3 μm的孔.动电位极化测量显示,该新型微弧氧化膜的耐蚀性有明显提高,腐蚀电流降低了2个数量级,而自腐蚀电位正移了0.07 V.盐雾试验结果同样证实微弧氧化膜的耐蚀性有大幅度提高.
연구료일충신적AZ31B미합금교류전미호양화(MAO)공예,채용료대배경경가우호적함규산염적희감용액작위전해질.결과발현양화과정분위2개계단,막후여미호양화시간정포물선관계.형모관찰표명,미호양화막유일개치밀층화일개다공층조성.치밀층적후도약점정개막후적40％,막표면적20％균균분포착직경1 ～3 μm적공.동전위겁화측량현시,해신형미호양화막적내식성유명현제고,부식전류강저료2개수량급,이자부식전위정이료0.07 V.염무시험결과동양증실미호양화막적내식성유대폭도제고.
A new micro-arc oxidation (MAO) process for AZ31B magnesium alloy,based on a more environmentally friendly electrolyte solution consisting of diluted alkaline solution with silicate under alternating current, was investigated.The findings show that oxidation behavior can be divided into two stages.The relation between film thickness and anodizing time is of parabolic dependence.The morphological views indicate that the film consists of a compact layer and a porous layer.The compact layer thickness is approximately 40％,and the 1-3 μm pores are evenly distributed with a coverage of about 20％ of the film.It is shown that new coating displays obvious improvement in the corrosion resistance by potentiodynamic polarization tests.The corrosion current is reduced by two orders of magnitude,and free corrosion potential shifts positively by 0.07 V.The results for salt spray testing also indicate that the corrosion resistance of MAO are promoted largely.