Fe^(2+)对铝合金无铬磷化的影响

通过电化学、X射线衍射、能谱仪、扫描电镜等分析方法研究了铝合金在含Fe2+磷化液中的磷化过程。结果表明,在磷化液中加入Fe2+后可使磷化膜均匀、致密,促进磷化膜的形成,磷化膜的主要成分为Zn3(PO4)2.4H2O和Zn2Fe(PO4)2.4H2O。

铝合金无铬磷化处理

研制一种不含铬的低温快速磷化液并用X射线衍射及能谱、扫描电镜、电化学等方法研究了游离酸度、温度和所含物质对其磷化效果的影响及磷化膜的晶相、形貌、耐蚀性.结果表明,该磷化液在35℃~45℃、5 min^8 min时,能在6061铝合金上形成一层致密均匀的磷化膜,膜重4 g/m2~6 g/m2,作为油漆底层具有良好的应用前景.

铝合金无铬磷化技术的研究

本文研究了铝合金的无铬磷化技术,分析了磷化工艺及磷化液各组分对转化膜的影响,采用正交实验对磷化液配方进行了优选,并对磷化助剂进行了大量的筛选。通过LK98C电化学综合测试系统测定了磷化转化膜的塔菲尔曲线,用金相显微镜观测了磷化膜的形貌。

Phosphate film free of chromate, fluoride and nitrite on AZ31 magnesium alloy and its corrosion resistance

A phosphate solution free of chromate, fluoride and nitrite was prepared and an environment-friendly film was obtained on AZ31 magnesium alloy surface via the chemical deposition method. The morphology, composition, phase structure and its corrosion resistance were studied. The effects of film-forming temperature and free acid on corrosion resistance, microstructure and electrochemical behavior of the film were discussed. The results indicate that the corrosion resistance of AZ31 with the phosphate film was better than blank AZ31 substrate, which was most attributed to the great inhibitive action on the anodic dissolution and cathodic hydrogen evolution of the film.