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过回流焊炉后贴片零件出现炸锡怎么解决
发布时间:2020-07-26

有些人会发现PCB在过回流焊炉时,电感类零件经过回流炉之后会有炸锡的现象,侧面出现炸锡导致短路,以前过不会有,东西没有换,现在为什么会有呢?高倍放大镜观察零件侧面炸了一个圆的窟窿,侧面爬的锡不同程度都炸没了,目前只出现在贴片的电感上,不良率10%左右,请教一下是怎么回事?回流焊炉温没问题,锡膏的回温等等也在管控,X-ray观察我厂的锡膏,过回流焊炉后气泡较多,个别气泡较大,要求锡膏厂商调整锡膏成分比例,未见明显效果。 这两天观察一些电源板的贴片电阻上居然也有鼓包,硬物一捅就破了。下面我们来分析一下具体的原因和解决办法:  

CHANSHENGZHAXIDEYUANYINYOUHENDUO,YIBANSHIYINWEIZAIGUOHUILIUHANLUGUOCHENGZHONG,YOUXIEWUZHIKUAISUQIHUA,CHANSHENGHENDUOQITI。ZHEIXIEQITIYOUCONGXIGAOZHONGCHONGCHULAI,SUOYICHUXIANLEZHAXIXIANXIANG。RUGUOXIANGYAOFENXIZHAXICHANSHENGDEYUANYIN,SHOUXIANWOMENYAOFENXIQITIDELAIYUAN。

爆锡炸锡.jpg

XIAMIANWOJIUGENJUZIJIDEJINGYAN,LAISHUOYISHUOCHANSHENGZHAXIDEYUANYIN:

1、SHOUXIANKANXIGAOLAILIAOHUOBAOCUNSHIFOUYOUWENTI,XIGAOSHIFOUGUOQIHUOSHOUCHAO,HANXIGAONEIBUYOUXIECAILIAOSHIXISHIXINGBIJIAOQIANGDE,HUANBUTONGPINPAIDEXIGAODUIBIYIXIA。LINGWAIHANXIGAOCONGBINGXIANGNACHULAIZHIHOUYOUMEIYOUZHENGCHANGHUIWEN,RUGUOXIGAOHUIWENSHIJIANBUGOUJIUKAIFENG,HUOZHEHUIWENGUOCHENGZHONGMIFENGBUYANJINRUSHUIQI,XIGAOZHONGHANYOUSHUIFENZAIGUOHUILIULUSHIJIUHUIZAOCHENGBAOXI。WOMENYIQIANDEKEHUJIUCHUXIANGUOCANGKUWANGLEJIANGXIGAOSHOUDAOCANGKUBINGXIANG,FANGZAIWAIMIANBAOSHAISANTIAN,SHIYONGZAIJIANDANDEBANSHANGYECHUXIANGUOTONGYANGWENTI。 

2、PCB板和元件是否受潮或浸水,车间的湿度太大,受湿的PCB经过回流炉加热产生了水气,水分多了就会产生炸锡。如果锡膏没有问题,可以在前面加一个
工序,把pcb板和元件烘烤一下。
3、最后我们来看一下回流焊炉的炉温是否进行了重新的测试是否在标准范围,炉温的预热的时间是否太短,物料规格书上有没有特别温度要求?回流温度曲线不合理,锡膏中溶剂在预热区没有充分挥发,进入高温后大量挥发产生的气体。另外要看一下 升温斜率是不是太大了,查看以上问题后按实际情况调整炉温曲线。 

WOMENKEYIYONGPAICHUFA,YIGEYIGEDESHIYAN,BAKENENGCHUWENTIDEDIANXIANLUOLIEYIXIA:XIGAO,PCBBAN,YUANQIJIAN,LUWENDENG,QITATIAOJIANBUBIAN,GENGHUANQIZHONGDANYITIAOJIAN,ZHUXIANGPAICHU,JIBENJIUNENGZHAODAOWENTIDIAN. 

ZHAODAOBAOXIDEYUANYINHOU,WOMENKEYIYONGYIXIAFANGFACHANGSHIJIEJUE:

 1、RUGUOSHIXIGAOWENTINEIJIUHAOJIEJUELE,HUANGEPINPAIHUOHUANGEPICIGENJINYIXIA,DANRUGUOZHENSHIXIGAODEWENTIYINGGAISUOYOUSHENGCHANDEJIXINGDOUHUIBUTONGCHENGDUYOUCIWENTI,RUGUOTONGYIPINPAIXIGAOZHIYOUZHEIGEJIXINGYOUCIWENTINEIJIUYAOKAOLVQITAYUANYINLE。

2:PCBBANCAISHOUCHAOKEYICHAKANRUGUOYOUSHIDUKADEHENRONGYIFAXIAN,RUGUOMEIYOUNEIZHINENGHONGKAOYIPIGENJINYIXIAJIUHUIYOUJIEGUO,CHAKANSHIFOUYOUPCBGUOKONG。

3:YUANQIJIANSHOUCHAOKEYIHONGKAOCHULI,DANGERENGANJUEYUANQIJIANSHOUCHAODEKENENGXINGJIAOXIAO,KEYONGPAICHUFAYIBUBUQUFENXI。

4:ZHICHENGGUANKONGYOUMEIYOUWENTIXUYAOQUGENJIN。

5:DUIHUILIUHANLUWENJINXINGCESHIJIANCHAYOUMEIYOUWENTI。

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