| 六偏磷酸钠对LD7铝合金微弧氧化陶瓷膜结构及耐腐蚀性能的改善作用 |
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| 引用本文： | 但敏,童洪辉,沈丽如,金凡亚,李炯.六偏磷酸钠对LD7铝合金微弧氧化陶瓷膜结构及耐腐蚀性能的改善作用[J].材料保护,2011,44(5). |
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| 作者姓名： | 但敏 童洪辉 沈丽如 金凡亚 李炯 |
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| 作者单位： | 核工业西南物理研究院,四川,成都,610041 |
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| 基金项目： | 国家自然科学基金(10875038)资助 |
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| 摘 要： | 目前未见采用微弧氧化技术提高LD7铝合金耐腐蚀性能的有关报道。在磷酸盐体系电解液中添加一定量的(NaPO3)6,采用微弧氧化(MAO)技术在其表面原位生成陶瓷层。通过扫描电镜、X射线衍射和电化学极化曲线等方法研究了添加(NaPO3)6对微弧氧化陶瓷层组成、结构及耐腐蚀性能的影响。结果表明:添加(NaPO3)6后膜层厚度增加,表面粗糙度降低,膜层更加平滑致密,微孔数量明显减少;膜层主要由α-Al2O3,γ-Al2O3和少量的AlPO4相组成,以α-Al2O3为主;在3.5%NaCl溶液室温电化学行为中,微弧氧化后其自腐蚀电流密度比基体降低了2个数量级,添加(NaPO3)6后引起了阳极过程阻滞并减少Cl-富集,从而抑制了点蚀,使自钝化趋势得到提高,耐腐蚀性能明显增强。
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| 关 键 词： | 微弧氧化 LD7铝合金 六偏磷酸钠 陶瓷膜结构 耐腐蚀性能 |
Improvement Effect of Sodium Hexametaphosphate on Microstructure and Corrosion Resistance of Micro-Arc Oxidation Coating of LD7 Aluminum Alloy |
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| DAN Min,TONG Hong-hui,SHEN Li-ru,JIN Fan-ya,LI Jiong.Improvement Effect of Sodium Hexametaphosphate on Microstructure and Corrosion Resistance of Micro-Arc Oxidation Coating of LD7 Aluminum Alloy[J].Journal of Materials Protection,2011,44(5). |
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| Authors: | DAN Min TONG Hong-hui SHEN Li-ru JIN Fan-ya LI Jiong |
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| Affiliation: | DAN Min,TONG Hong-hui,SHEN Li-ru,JIN Fan-ya,LI Jiong(Southwestern Institute of Physics,Chengdu 610041,China) |
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| Abstract: | Ceramic coating was prepared on the surface of LD7 aluminum alloy via micro-arc oxidation in a phosphatic electrolyte system containing sodium hexametaphosphate (NaPO3)6] additive.The effect of the additive on the composition,microstructure and corrosion resistance of the micro-arc oxidation coating was investigated using a scanning electron microscope,an X-ray diffractometer and an electrochemical test rig.It was found that after adding(NaPO3)6,the thickness,smoothness and compactness of the micro-arc oxi... |
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| Keywords: | micro-arc oxidation LD7 aluminum alloy sodium hexametaphosphate microstructure of ceramic coating corrosion resistance |
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