Al-Zn合金热镀层的化学组成与电化学腐蚀行为研究

On Chemical Composition and Electrochemical Corrosion Behaviour of the Al- Zn Alloy Hot- Dip Coating

在制备不同合金成分的热镀 Al- Zn合金镀层基础上 ,于不同介质条件下对其进行了有关电化学的测量。可知含铝量 5 %和 5 5 %的两种样品具有良好的防腐性能 ,而含铝量约在 2 5 %左右的防腐性能最差。从所得到的电化学参数分析证实了上述差别。这三种典型成分的特殊性 ,说明了防腐性能与铝含量并不呈线性关系 ,而可能与合金镀层的结构、腐蚀产物相联系。

The electrochemical parameters of hot- dip Al- Zn alloy coating of different al- loying components have been measured in several mediums.Two samples contained5% and55% aluminium have a good corrosion- resistance.The results show that the relation between corro- sion- resistance and aluminium content of alloy is not linearly.