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一、特点
1. 不含六价铬,厚膜,三价铬镀锌层彩色钝化剂。
2. 高耐蚀性能,盐雾测试白锈可达120小时以上。
3. 常温操作,免除一般三价铬厚膜工艺加热工序,降低成本。
4. 有自修复特性。
5. 适用于所有镀锌层。
二、钝化工艺要求
名 称 | 开缸范围 |
KRB-17A彩钝剂 (ml/L) | 80-100 |
PH | 1.5-3.0 |
温度 (℃) | 20-40 |
钝化时间 (sec) | 40-60 |
三、工艺流程
镀锌——水洗——出光(0.5%硝酸)——水洗——钝化——水洗——热水——烘干
四、维护
1.平日只需控制好PH值,PH低,钝化层颜色带黄;PH高,钝化层颜色带绿。
2.铁杂质会降低耐蚀性,使钝化膜发黄,变色。要保证水洗干净,出光液要经常更换,减少铁离子带入。也可使用三价铬钝化除铁剂,或使用离子树脂交换过滤除掉铁离子。