摘要
通过分析铝的多孔型膜在(NH_4)2MoS_4水溶液中恒电流密度下二次阳极氧化时对应的电压与时间关系曲线,提出如下机理:二次阳极氧化过程中,孔中溶液酸度的变化引起电场助溶作用下孔中溶液对阻挡层溶解能力的变化,因而在二次阳极氧化的不同阶段阻挡层的厚度不同。对应的电压与时间关系曲线则反映了阻挡层厚度的变化。建立了孔中OH^-和MoS_4^(2-)等离子的迂移模型。
It is proposed that a critical concentration of hydrogen ion in pores of the anodic film exists, above which the film material at pore bases dissolves during reanodizing process. A formula on the critical hydrogen ion concentration is derived, based on ion diffusion model.Good agreement is reached between the experimental results and the theoretical predictions from the formula.The improved sample preparation technique in ultramicrotomed sectioning used in this work, allowed direct observation of pore bases of thick porous films(20～30μm) in TEM. Morphological features of the microstructure of the film and the deposited loose molybdenum sulphide are described.
出处
《中国腐蚀与防护学报》
CAS
CSCD
1990年第2期89-96,共8页
Journal of Chinese Society For Corrosion and Protection
基金
国家自然科学基金
