多道富锌基涂层的电化学行为研究表明, 涂层中的 Zn粉未表现出明显的阴极保护作用, 即使在富锌涂层上覆盖几个微米厚的环氧清漆涂层, Zn的阴极保护作用也会变得非常微弱. Zn粉对钢铁的保护作用在于Zn粉腐蚀产物对涂层的“自修复能力”. 在环氧清漆覆盖条件下, 无机富锌涂层中Zn粉的反应活性比有机富锌涂层中Zn粉的高, 即Zn粉的反应速度更快.
The electrochemical behaviors of the zinc--rich paints based multilayer organic coatings in 3.5% NaCl solution were studied. The results show that the zinc powder has a minor cathodic protection effect. The protection effect is due to the repair of holes by the corrosion product of zinc powder. Under the epoxy topcoat, the corrosion rate of the zinc powder in inorganic zinc--rich coatings is faster than that in organic type.
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