Effects of Phosphorus-Free Conversion Process Parameters on the Adhesion Properties of Electrophoretic Paint Film
To address the issue of insufficient adhesion strength of electrophoretic paint film on the cold-rolled steel plates beneath the doors of white body vehicles， this study compared the effects of various process parameters， including phosphorus-free conversion treatment time， electrophoretic baking te...
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Department of Materials Protection
2025-02-01
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| Series: | Cailiao Baohu |
| Subjects: | |
| Online Access: | http://www.mat-pro.com/fileup/1001-1560/PDF/20250217.pdf |
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| Summary: | To address the issue of insufficient adhesion strength of electrophoretic paint film on the cold-rolled steel plates beneath the doors of white body vehicles， this study compared the effects of various process parameters， including phosphorus-free conversion treatment time， electrophoretic baking temperature， free fluoride ion concentration， and ferrous ion accumulation， on the adhesion of electrophoretic paint film.Through random on-site inspections of thickness and adhesion strength of the electrophoretic paint film， it was found that when the coating thickness of the phosphorus-free conversion layer exceeded 40 mg/m2， adhesion failure of the electrophoretic paint film on the cold-rolled steel beneath the doors of white body vehicles was likely to occur.Based on both on-site data and laboratory simulation tests， the following conclusions were drawn: only by strictly monitoring the non-phosphorus conversion bath in accordance with the on-site process parameters， controlling the ferrous ion content below 25 mg/L and the fluoride ion concentration at 20～40 mg/L，can the adhesion of the electrophoretic paint film on the plate at this position reach the standard and adapt to the mass production process on site. |
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| ISSN: | 1001-1560 |