温涛涛,陈玉华,陈伟,等.CMT电弧增材制造铝青铜的微观组织及耐腐蚀性能研究[J].精密成形工程,2019,11(5):149-154.
WEN Tao-tao,CHEN Yu-hua,CHEN Wei,et al.Microstructure and Corrosion Resistance of Aluminum Bronze Made by CMT Arc Additive ManufacturingTechnology[J].Journal of Netshape Forming Engineering,2019,11(5):149-154. |
| CMT电弧增材制造铝青铜的微观组织及耐腐蚀性能研究 |
| Microstructure and Corrosion Resistance of Aluminum Bronze Made by CMT Arc Additive ManufacturingTechnology |
| 投稿时间：2019-07-21 修订日期：2019-09-10 |
| DOI：10.3969/j.issn.1674-6457.2019.05.023 |
| 中文关键词: CMT 增材制造 铝青铜合金 微观组织 耐腐蚀性 |
| 英文关键词: CMT additive manufacturing aluminum bronze alloy microstructure corrosion resistance |
| 基金项目:国家自然科学基金（51565040） |
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| 摘要点击次数: 2847 |
| 全文下载次数: 1964 |
| 中文摘要: |
| 目的 研究冷金属过渡技术（Cold metal transfer，CMT）增材制造Cu-Ni-Al-Mn-Fe铝青铜合金的微观组织演变规律以及在不同温度下的耐腐蚀性能。方法 采用CMT电弧增材的方式制备了铝青铜合金的薄壁试样件，通过光学显微镜研究了试样件在不同位置的微观组织演变规律，并通过电化学工作站测试试样在质量分数为3.5%的NaCl溶液中的电位极化曲线，进而分析其耐腐蚀性能。结果 CMT电弧增材制造铝青铜合金的微观组织主要表现为3个区域。前3层微观组织由基材树枝晶转变为柱状晶的区域；中间稳定区域主要是垂直于基板方向生长的均匀柱状晶微观组织；以及在最后一层出现柱状晶转向树枝晶的区域。当温度由20 ℃上升到60 ℃时，该材料的稳定电位ER由-0.2540 V下降到-0.2745 V。自腐蚀电流密度由2.84×10-6 A/cm2增加到了5.149×10-6 A/cm2。结论 采用合适工艺参数，可以获得致密无缺陷的CMT电弧增材制造铝青铜合金薄壁试样，在试样的稳定区域，微观组织是外延生长的柱状晶。同时试样在质量分数为3.5%的NaCl浓度溶液中有着良好的耐腐蚀性能，并且由于腐蚀过程介质温度的升高，电极反应速度加快、溶液的对流和扩散加强，从而加快了阳极过程和阴极过程，加速了金属的腐蚀。由此可见，介质温度对腐蚀速率的影响是非常重要的。 |
| 英文摘要: |
| The paper aims to study the microstructure evolution of Cu-Ni-Al-Mn-Fe aluminum bronze alloy cold metal transfer (CMT) additive manufacturing and its corrosion resistance at different temperatures. Thin-walled specimens of aluminum bronze alloy were prepared by CMT arc addition. The microstructure evolution of the specimens at different locations was studied by optical microscopy, and the potential polarization curve of samples in 3.5% NaCl concentration was tested in electrochemical workstation to analyze its corrosion resistance. The microstructure of the aluminum bronze alloy produced by CMT arc additive was mainly represented by three regions. The first three layers of microstructure were transformed from a substrate dendrite to a columnar crystal region; the intermediate stable region was mainly a uniform columnar crystal microstructure grown perpendicular to the substrate direction; and a region where columnar crystals turned to dendrites was in the last layer. When the temperature was raised from 20 ℃ to 60 ℃, the stable potential ER of the material dropped from -0.2540 V to -0.2745 V. The self-corrosion current density increased from 2.84×10-6 A/cm2 to 5.149×10-6 A/cm2. With suitable process parameters, a thin-walled sample of aluminum bronze alloy can be obtained by compacting and defect-free CMT arc additive. In the stable region of the sample, the microstructure is epitaxially grown columnar crystal. At the same time, the sample has good corrosion resistance in the 3.5% NaCl concentration solution, and the electrode reaction speed is accelerated due to the increase of the medium temperature during the etching process, and the convection and diffusion of the solution are strengthened, thereby accelerating the anode process and the cathode process, and thus accelerating the metal corrosion. It can be seen that the influence of the medium temperature on the corrosion rate is very important. |
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