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Surface pretreatment
The pre-treatment stage generally includes two processes: degreasing and chemical film-forming. These two processes play an important role in the entire coating process and are crucial steps to ensure the quality of subsequent coatings. Therefore, only by controlling the quality of its operation can a good foundation be laid for the subsequent coating process.
The main purposes of pre-treatment are twofold: ① to improve the corrosion resistance of coated steel plates; ② Improve the adhesion between organic coatings and substrates.
There are two main ways to form chemical conversion films: reaction type and roller coating type.
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