Zhang Li,Zhao Chao,Pang Zhiwei,et al.Influence of ZnO on the chemical milling behavior of 2219 aluminum alloy in sodium hydroxide solution?/html>[J].Plating & Finishing,2023,(8):7-12.[doi:10.3969/j.issn.1001-3849.2023.08.002]
ZnO对2219铝合金在氢氧化钠溶液中化铣行为的影响
- Title:
- Influence of ZnO on the chemical milling behavior of 2219 aluminum alloy in sodium hydroxide solution?/html>
- Keywords:
- 2219 aluminum alloy ; chemical milling ; Al 2 Cu ; ZnO ; roughness
- 分类号:
- TG146
- 文献标志码:
- A
- 摘要:
- 针对高含铜铝合金化铣后粗糙度大的问题，本文以 2219 铝合金为研究对象，通过电化学测试、 X 射线衍射仪（ XRD ）、能谱仪（ EDS ）以及微观形貌测试等研究了 2219 铝合金在氢氧化钠溶液中的溶解行为，并探讨了 2219 铝合金化铣后表面粗糙度的控制机理，以此来寻找合适的添加剂，达到降低化铣后表面粗糙度的效果。结果表明： 2219 铝合金在氢氧化钠溶液溶解时，由于富铜相和富铝相电极电位的差异造成了两者之间溶解速率的差异，使得溶解较慢的富铜相（ Al 2 Cu ）裸露形成凸起或者脱落形成凹坑，造成表面粗糙度增大。此外， ZnO 的加入可以使锌沉积在富铝相表面，抑制富铝相的溶解，促进富铜相和富铝相的溶解速率相互接近。实验结果也验证了 ZnO 的加入确实降低了化铣后试样表面的粗糙度，粗糙度可低至 3.8 μ m 。
- Abstract:
- ： Aiming at the problem of large roughness of aluminum alloy with high copper content after chemical milling ， 2219 aluminum alloy was taken as the research object in this paper ， and the dissolution behavior of 2219 aluminum alloy in sodium hydroxide solution was studied by electrochemical testing ， X-ray diffraction （ XRD ）， energy dispersive spectroscopy （ EDS ）， and microscopic morphology testing. The control mechanism of surface roughness of 2219 aluminum alloy after chemical milling was discussed to find suitable additives to reduce the surface roughness after chemical milling. The results show that when 2219 aluminum alloy is dissolved in sodium hydroxide solution ， the difference of electrode potential between copper-rich phase and aluminum-rich phase causes the difference of dissolution rate between the two phases ， which makes the copper rich phase （ Al 2 Cu ） with slower dissolution become exposed to form a bulge or fall off to form a pit ， resulting in the increase of surface roughness. In addition ， the addition of ZnO can make zinc deposition on the surface of the aluminum-rich phase ， inhibit the dissolution of the aluminum-rich phase ， and promote the dissolution rate of the copper-rich phase and the aluminum-rich phase to be close to each other. The experimental results also verified that the addition of ZnO really reduced the roughness of the sample after milling ， and the roughness can be as low as 3.8 μ m.
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备注/Memo
收稿日期： 2022-11-01 修回日期： 2022-12-03 * 通信作者： 杜楠，研究方向为材料在自然环境的腐蚀、金属电沉积理论及工艺， email ： d ＿ nan@sina.com 基金项目： 江西省研究生创新基金（ YC2020-001 ）