Precautions for application of metal powder coating

1 Coating method of metal powder coating

In most cases, electrostatic spray gun is used for coating, because this type of products contain metal pigments. When using electrostatic gun for construction, excellent grounding of the system shall be ensured, and low electrostatic voltage and powder output shall be set together to prevent ignition during spraying. The effect of the coating film is closely related to the setting, quality or brand of the spray gun. After long-term spraying, a lot of metal powder may accumulate at the discharge needle of the spray gun, and the constructor is required to clean up the discharge needle on time.

2 gloss of metal powder coating

In most cases, because of the large error, it is not recommended to use the gloss meter to measure the gloss of the metal appearance film, but only use the visual comparison method to judge whether it is the same as the standard sample.

3 recoverability of metal powder coatings

As for the powder made by dry mixing method, because there will be differences in the spraying and recovery process, there will be certain differences in the content of metal pigment between the recovered powder and the new powder, which may lead to different appearance of the film and color deviation. This is determined by the different properties between metal pigment and powder particles. Experts suggest that the ratio of recovered powder to new powder should be at least 1:4. Assuming that the powder coating made by bonding and fixing method can recover the powder from scratch because the ratio between metal pigment and powder particles is relatively fixed.

4 gloss coating of metal powder coating

Spraying a gloss coating on the metal powder coating has the following benefits: enhancing the stone impact resistance of the metal powder coating; Beautiful effect of adding metal powder coating; Completely handle the abradability of metal pigments; Advance the weather resistance of metal powder coating. In order to ensure the appearance effect of the glossing layer, the workpiece sprayed for the first time shall not be polluted. Therefore, it is generally required to have a fully automated spraying line and two sets of independent spraying rooms for coating respectively. Generally, it is recommended not to spray the gloss coating. It only needs to be used when the requirements are very high, such as high-end household appliances, car wheels and outdoor applications (to ensure weather resistance).

5 abradability of metallic pigments

Whether the powder is made by dry mixing method or bonding fixation method, it can not completely deal with the problem of abradability of metal pigments. The only way to deal with the abradability is to spray a clear coating on the metal powder coating.

6. Adhere to the method of combining the appearance of metal powder coating

(1) For the same product, try to use the same batch of metal powder coating to prevent the difference between batches of powder coating.

(2) Try to keep the spraying conditions stable. Use the same set of spraying equipment and the same parameters such as voltage and air pressure; Try to keep the interval between the spray gun and the workpiece unchanged, and try to keep the film thickness stable; Ensure that the powder coating is fully fluidized before spraying; When using recovered powder, ensure that the ratio of recovered powder to new powder is at least 1:4; Avoid using metal powder coating to spray the workpiece with messy shape or deep depression as far as possible; It is recommended that multiple workpieces assembled together should be painted together.

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