摘要： 采用 X射线衍射(XRD)、扫描电镜(SEM)及能谱(EDX)和电化学研究的方法，研究了硝酸钍对 6061铝合金锌系磷化成膜过程的影响，结果表明:少量的硝酸钍添加到磷化液中可以提高磷化成膜速度和细化晶粒，改变磷化膜的组成，硝酸钍是具有良好载氧能力的促进剂，与在不含硝酸钍的磷化液中所形成的磷化膜相比，铝合金在含有硝酸钍磷化液中所形成的磷化膜具有较低的化学活性，其耐蚀性得到很大的提高，在所研究的工艺条件下，最佳硝酸钍含量为 20~35m g/L。
关键词:
常温,
铝合金,
磷化;电 化学,
硝酸钍
Abstract: The influence of thorium nitrate on the zinc phosphate coatings on aluminum alloy were studied by X-ray diffraction (XRD), scanning electron microscopy( SEM), energy-dispersive X-ray(EDX) and electrochemical measurements. The results showed that smale amount of thorium nitrate in phosphating solution can accelerate phosphate deposition and consumedly decrease zinc phosphate crystal size,and change the chemical composition of zinc phosphate coatings nitrate concentrations of the phosphating solutions change, which provided good capacity to transport oxygen and debase polarization of cathode. The phosphate coatings formed in phosphating solutions containing thorium nitrate can lower chemical reactivity of phosphating film and improved corrosive resistance, compared with thorium nitrate free. The optimum level of thorium nitrate was 20-35 mg/L.
Key words:
room temperature,
aluminum alloy,
phosphating,
electrochemical,
thorium nitrate
李红玲, 娄淑芳, 付小宁. 常温铝合金锌系磷化过程的电化学研究[J]. 涂料工业, 2010, 40(4): 37-39.
Li Hongling, Lou Shufang, Fu Xiaoning. Electrochemical Study of Room Temperature Zinc Phosphating on Aluminum Alloy[J]. Paint & Coatings Industry, 2010, 40(4): 37-39.