Wang Xinhui,Hao Jianjun*,Mu Shihui,et al.Effect of lanthanum nitrate on corrosion resistance of passivation film on zinc aluminum magnesium alloy[J].Plating & Finishing,2023,(1):23-27.[doi:10.3969/j.issn.1001-3849.2023.01.004]
硝酸镧对锌铝镁合金表面钝化膜耐蚀性的影响
- Title:
- Effect of lanthanum nitrate on corrosion resistance of passivation film on zinc aluminum magnesium alloy
- Keywords:
- passive film ; lanthanum nitrate ; corrosion resistance
- 分类号:
- TG174.45
- 文献标志码:
- A
- 摘要:
- 为解决锌铝镁钢板的耐蚀性问题，以硝酸镧作为稀土添加剂在其表面制备丙烯酸树脂 - 硅烷 - 稀土钝化膜层。采用扫描电子显微镜、 X 射线衍射光谱分析、电化学工作站、中性盐雾试验等方法，研究了不同硝酸镧添加量对钝化膜结构及耐蚀性的影响。结果表明，钝化膜以堆积方式沉积到基材表面，硝酸镧添加量为 0.5% 时，耐盐雾试验时间可达到 72 h ，腐蚀电流密度降低至 1.11×10 -6 A·cm -2 ，相较于基体降低了两个数量级，耐黑变性良好。
- Abstract:
- ： In order to solve the problem of corrosion resistance of zinc-aluminum-magnesium steel sheet ， an acrylic resin-silane-rare earth passivation film was prepared on its surface using lanthanum nitrate as a rare earth additive. The effects of different amounts of lanthanum nitrate on the structure and corrosion resistance of passive film were studied by means of scanning electron microscope ， X-ray diffraction spectrum analysis ， electrochemical workstation and neutral salt spray test. The results show that the passivation film is deposited on the surface of the substrate in a stacking manner. When the addition of lanthanum nitrate is 0.5% ， the corrosion resistance can reach NSST/72 h ， the corrosion current density reduced to 1.11×10 -6 A·cm -2 ， which is two orders of magnitude lower than that of the matrix ， and the blackening resistance is good.
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备注/Memo
收稿日期： 2022-03-23 修回日期： 2022-04-12 作者简介： 王薪惠（ 1994 ―），女，硕士研究生， email ： 2023397746@qq.com * 通信作者： 郝建军， email ： hjj68881@163.com?/html>