喷砂除锈法

喷砂除锈法

    喷砂法除锈是利用压缩空气,把一定粒度的砂子通过喷枪喷在零件锈蚀的表面上,不仅除锈快,还可为涂装、喷涂、电镀等工艺做好表面准备,经喷砂处理的表面可达到干净的、有一定粗糙度的表面要求,从而提高复盖层与零件的结合力。

 

    常用的喷砂除锈方法有干法喷砂、湿法喷砂、无尘喷砂和高压水喷砂等。干法喷砂尘土大,有碍环保,危害健康;湿法虽无粉尘,但水分会使表面再度生锈。防止的办法是在水中加入1%~15%的防锈剂(磷酸三钠、碳酸钠、亚硝酸钠等)和乳化剂或肥皂水,使其表面在短时期内不再生锈,然后再涂保养底漆。无尘喷砂是将加砂、喷砂和集砂回收等在一密闭系统里连续循环进行,以免粉尘飞扬。高压水喷砂主要用于大面积除锈,如船体、油舱、油罐、锅炉等,水中也常加入钝化剂和肥皂 水。

 

   抛丸或喷砂除锈

 

    1、 除锈质量等级要求

    ① 所有待涂水性无机富锌涂料的钢材表面,必须抛丸或喷砂达到ISO8501-1(GB8923-88)Sa2.5级要求。 

    ② 局部修补涂层时,钢材表面必须打磨至ISO8501-1 (GB8923-88) St3级。

 

    2、 表面粗糙度要求:表面粗糙度要求控制在35~65μm范围内。

 

    3、 磨料

    ① 为确保抛丸或喷吵后钢材表面达到规定的清洁度和表面粗糙度,推荐使用棱角状或圆珠状的粒度为0.3 - 0.8mm的不锈钢砂。

    ② 所用磨料应是清洁干燥的,不可被有机物沾污。

 

    4、压缩空气:喷砂用压缩空气,压力应不低于0.5 Mpa。

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