MU Shihui*,LI Xinyu.Growth of Phosphating Film on AZ91D Magnesium Alloy Under Constant Current[J].Plating & Finishing,2021,(9):1-5.[doi:10.3969/j.issn.1001-3849.2021.09.001]
恒电流作用下AZ91D镁合金磷化膜生长研究
- Title:
- Growth of Phosphating Film on AZ91D Magnesium Alloy Under Constant Current
- 文献标志码:
- A
- 摘要:
- 采用恒电流法在AZ91D镁合金表面制备磷酸盐转化膜，通过计时电位法研究了镁合金在锌锰系磷化液中的电化学磷化过程，结合X射线衍射、扫描电子显微镜以及能谱测试分析了电化学磷化膜不同生长阶段膜层成份及微观形貌的变化规律。结果表明，镁合金在电化学磷化初始阶段，在化学、电化学作用下，α-Mg相首先发生溶解，并在溶解处出现不完整膜层，成分为Mg3（PO4）2，β-Al12Mg17相区域内出现颗粒状晶体，晶体成分为Zn3（PO4）2·（H2O）4、Mn3（PO4）2·7H2O及少量Mg3（PO4）2。随着磷化进行，α-Mg相区域的膜层增厚，β-Al12Mg17相区域内晶体逐渐长大聚集成呈花状球型晶簇。磷化60 s后，磷化膜的生长以β-Al12Mg17相区域内花状球型晶簇为主，形成以Zn3（PO4）2·（H2O）4、Mn3（PO4）2·7H2O和Mg3（PO4）2物质组成的磷化膜。
- Abstract:
- Phosphate conversion coating was prepared on the surface of AZ91D magnesium alloy by galvanostatic method. The electrochemical phosphating process of magnesium alloy in zinc-manganese phosphating solution was studied by chronopotentiometry method. Changes of the composition and morphology of the electrochemical phosphating films at different growth stages were analyzed by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and energy dispersive spectroscopy （EDS）. The results show that in the initial stage of electrochemical phosphating, the α-Mg phase first dissolves under the action of chemistry and electrochemistry, and an incomplete coating appears at the dissolution site. The composition of the film is Mg3（PO4）2, granular crystals appear in the β-Al12Mg17 phase region. The crystal compositions are Zn3（PO4）2·（H2O）4, Mn3（PO4）2·7H2O and a small amount of Mg3（PO4）2. With the progress of phosphating, the film thickness of the α-Mg phase region is thickened, and the crystals in the β-Al12Mg17 phase region are gradually grown up to form a flower-like spherical crystal cluster. After phosphating for 60 s, the growth of the film is mainly flower like spherical crystal cluster in the region of β-Al12Mg17 phase, forming a phosphating film consisting of Zn3（PO4）2·（H2O）4, Mn3（PO4）2·7H2O and Mg3（PO4）2.
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备注/Memo
收稿日期： 2020-09-25；修回日期： 2020-11-06
作者简介： 牟世辉（1974—），女，学士，高级实验师，研究方向：金属表面处理和功能材料，email：shihuimu@163.com