发布时间:2025-01-30 06:04:12
一块一块脱落有二种原因,第一工件表面有油污,造成涂层附着力不够。第二种,是进烤炉的时间短或者温度不够。二种原因都会造成涂层掉落,但二者有区别,前者是大面积的脱落,后者是小面积的。如果有经验是完全可以驱分的。
工件表面前处理,最好是用磷化。就是除油,除锈,再上一层磷化膜,经过磷化的产品,喷涂后表面效果和附着力都比打砂好。
晶体管超外差式收音机(X—921型收音机)每部分的作用及原理
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