When there are defects in surface chemical coatings, it is very important to distinguish the degreasing stage from the segmenting stage, which is very important for judging the causes of defects.
It can be judged by changing the operation process or solution parameters of the degreasing section without changing the chemical solution before coating. If the effect is not obvious, the operation process or chemical solution of the degreasing section should be modified appropriately, so that it is easy to identify the problem and find out the process and scope of the defect. If it is proved that the defect occurs in the degreasing section or in the transforming section, then try to correct the process of producing the defect.
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