推荐回答(1个)
一、发黑膜层不均匀
产生原因 1、工件去油不干净2、清洗不彻底3、工件重叠在一起
排除方法 1、加强去油,加大水冲洗。 2、去油后用热水洗再用冷水冲 3、抖动工件,从夹具上考虑。
二零件表面疏松,结合力不牢固
产生原因 1、发黑时间过长或过短。2、零件表面有残余物
排除方法 1、严格工艺适当控制时间2、加强发黑的前处理
三发黑膜色浅
产生原因 1、发黑时间太短2、成分不足
排除方法1、延长发黑时间2、调整或更换溶液
四光泽性差,有锈斑
产生原因 1、脱水油中水分太多2、零件脱水时间短
排除方法 1、排除水分,检查脱水油或更换2、延长脱水时间
五牢固性比碱性发蓝差
产生原因 1、发黑尚未作用完全2、零件的氧化层未除尽
排除方法1、发黑后放置一天再使用2、加强发黑前的处理
六工件有花斑 未涂油的工件可用水冲洗后补发0.5-1分钟
七不合格品返修 可用10%的稀硝酸除发黑膜后重新发黑
其它说明:
1、发黑件膜层附着力随存放时间的延长而增加,时间越长附着力越佳。发黑的零件用脱水防锈油封闭后,最好存放一天后再使用。
2、HH902钢铁常温发黑剂为浓缩液,每公斤浓缩液可发黑钢铁100-500公斤(表面积为8-10平方米左右)
3、本发黑剂不仅适用于零件浸泡发黑,也适用于大型零件涂刷喷涂和补黑。
4、本溶剂发黑过程中,有少量沉淀产生,不影响发黑质量。(注意:工作液不用时,需清除沉淀)
5、20公斤PE塑桶包装溶液贮存于阴暗处,防止日晒、高温及防冻保存期18个月。
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