崔永辉,邵忠财,李学田,魏守强.添加剂对铝合金稀土转化膜的影响[J].表面技术,2019,48(5):225-231.
CUI Yong-hui,SHAO Zhong-cai,LI Xue-tian,WEI Shou-qiang.Effect of Additives on Rare Earth Conversion Coatings on Aluminum Alloys[J].Surface Technology,2019,48(5):225-231 |
| 添加剂对铝合金稀土转化膜的影响 |
| Effect of Additives on Rare Earth Conversion Coatings on Aluminum Alloys |
| 投稿时间：2018-11-22 修订日期：2019-05-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.05.033 |
| 中文关键词: 铝合金 稀土 无铬钝化 耐蚀性 转化膜 电化学 |
| 英文关键词:aluminum alloys rare earth chrome-free passivation corrosion resistance conversion coating electrochemist |
| 基金项目:辽宁省自然科学基金（20170540776）；辽宁省高等学校创新人才支持计划资助（LR2017079） |
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| Author | Institution |
| CUI Yong-hui | Shenyang Ligong University, School of Environmental and Chemical Engineering, Shenyang, 110159, China |
| SHAO Zhong-cai | Shenyang Ligong University, School of Environmental and Chemical Engineering, Shenyang, 110159, China |
| LI Xue-tian | Shenyang Ligong University, School of Environmental and Chemical Engineering, Shenyang, 110159, China |
| WEI Shou-qiang | Shenyang Ligong University, School of Environmental and Chemical Engineering, Shenyang, 110159, China |
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| 中文摘要: |
| 目的 寻找有效提高稀土转化膜性能的添加剂体系。方法 采用电化学手段研究添加剂（硼酸、柠檬酸钠、磷酸钠、硅酸钠、氟化氢铵、氟化钠、草酸铵）对稀土转化膜的影响，对于具有积极作用的添加剂，使用响应面法进行复配，并优化配方。通过扫描电子显微镜（SEM）、能谱仪（EDS）和电化学测试对优化条件下制备的稀土转化膜性能进行表征。结果 向基础转化液中加入氟化钠（NaF）、柠檬酸钠（Na3C6H5O7）和磷酸钠（Na3PO4）可以提高稀土转化膜的电化学性能。经过复配并优化配方，得到最优添加剂体系为0.68 g/L氟化钠+0.80 g/L磷酸钠。该配方可以抑制铝合金在转化液中的溶解，有利于铈元素的沉积，使铈的沉积量由5.01%提高到了9.60%。优化配方下制备出的膜层更加均匀致密，腐蚀电位提高了0.13 V，点滴时间可达122 s。XRD和EDS结果表明，膜层的主要成分为非晶态的铈锰氧化物。结论 0.68 g/L氟化钠+0.80 g/L磷酸钠为最优添加剂配方。在优化体系中制得的稀土膜层的电化学性能得到了提升，表面更加均匀致密。 |
| 英文摘要: |
| The work aims to improve the corrosion resistance of rare earth conversion coatings on aluminum alloys. Study the effects of different additives (H3BO3, Na3C6H5O7, Na3PO4, Na2SiO3, NH4HF2, NaF, (NH4)2C2O4) on the rare earth conversion coating, and compound the additives with positive effects and optimize the formula by response surface methodology. Characterization of rare earth conversion coatings prepared under different conditions was evaluated by scanning electron mi-croscopy (SEM), energy dispersive spectroscopy (EDS), and electrochemical testing. The results showed that the addition of NaF, Na3C6H5O7 and Na3PO4 to the base conversion solution can improve the electrochemical performance of the rare earth conversion coating. After compounding and optimizing the formula, the optimal additive system was 0.68 g/L NaF+0.80 g/L Na3C6H5O7. The formulation can inhibit the dissolution of the aluminum alloy in the conversion liquid, is favorable for the deposition of Ce, and increases the deposition amount of Ce from 5.01% to 9.60%. The film prepared under the optimized formula is more uniform and dense with good electrochemical performance, corrosion potential increased by 0.13V, drip time up to 122 s. XRD and EDS results showed that the main component of the film is amorphous cerium or manganese oxide. |
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