Liu Jingchun*,Zhao Ziye,Zhao Jianguo,et al.The corrosion resistance of LDH coatings constructed via electrodeposition technique on AZ31B[J].Plating & Finishing,2024,(7):22-31.[doi:10.3969/j.issn.1001-3849.2024.07.004]
AZ31B镁合金表面电化学沉积LDH涂层及其耐腐蚀性能研究
- Title:
- The corrosion resistance of LDH coatings constructed via electrodeposition technique on AZ31B
- Keywords:
- magnesium alloy ; electrodeposition ; LDH ; corrosion resistance ; coatings
- 摘要:
- 为提高 AZ31B 镁合金的耐腐蚀性能，优化了原位电化学沉积层状双金属氢氧化物（ Mg-Al-LDH ）涂层的工艺参数。配制了不同浓度的溶液，用原位电化学沉积方法在 AZ31B 表面沉积了一层 LDH 涂层，用硬脂酸修饰后得到 SA-LDH 复合涂层。测试了其微观组织和化学成分，利用电化学极化和交流阻抗（ EIS ）实验表征了涂层的耐腐蚀性，确定优选的电化学沉积工艺对其组织性能的影响。结果表明：优选的溶液浓度为 0.05 mol/L 时，所得涂层表面多孔，与基体结合良好。 X 射线衍射能谱（ XRD ）中存在 LDH （ 003 ）与（ 006 ）两个特征峰。极化曲线显示 LDH 涂层腐蚀电流密度为 9.21×10 -6 A/cm 2 ，与无涂层镁合金相比降低两个数量级， SA-LDH 涂层的腐蚀电位提升到 - 1.33 V 。在 3.5 wt.% NaCl 溶液浸泡后的 LDH 涂层交流阻抗显示阻抗模值和频率增加，表现出较好耐腐蚀性。添加硬脂酸可以在涂层表面形成一层超疏水薄膜，能够有效地阻碍腐蚀介质 Cl - 对 AZ31B 镁合金的渗透侵蚀。
- Abstract:
- ： Aiming at improving the corrosion resistance of AZ31B magnesium alloy ， thein-situ electrochemical deposition process parameters of Mg-Allayered double hydroxide （ LDH ） coating was optimized. Different concentrations of electrochemical deposition solutions were prepared ， and a layer of LDH coating was deposited on the surface of AZ31B by in situ electrochemical deposition method ， and SA-LDH composite coating was obtained after modification with stearic acid. The microstructure and chemical composition were tested and analyzed ， the corrosion resistance of the coating was characterized by electrochemical polarization and alternating impedance （ EIS ） experiments ， so the influence of the preferred electrochemical deposition process on its microstructure properties was determined. The results show that the preferred solution concentration is 0.05 mol/L ， and the surface of the obtained coating is porous and well combined with the matrix. The X-ray diffraction （ XRD ） pattern showed two characteristic peaks of LDH （ 003 ） and （ 006 ） . The polarization curve results showed that the corrosion current density of LDH coating was 9.21×10 -6 A/cm 2 ， which was reduced by two orders of magnitude compared with uncoated magnesium alloy ， and the corrosion potential of SA-LDH coating increased to - 1.33 V. The AC impedance of LDH coating after immersion in 3.5 wt.% NaCl solution showed an increase in impedance modulus and frequency ， showing good corrosion resistance. By adding stearic acid ， a superhydrophobic film can be formed on the coating surface ， which can effectively hinder the penetration and erosion of AZ31B magnesium alloy by the corrosive medium Cl - .
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备注/Memo
收稿日期： 2023-09-04 修回日期： 2023-09-25 作者简介： 刘敬春（ 1982 —）男，副教授，从事材料的腐蚀防护与表面涂层研究工作， email ： jcliu33@126.com 基金项目： 河北省高等学校科学技术研究项目（ ZD2018224 ）；河北农业大学人才引进项目（ ZD201717 ）；河北农业大学理工基金项目（ LG201801 ）