The cause of chipping is poor adhesion and insufficient film thickness. A film thickness of over 40 microns can reduce the occurrence rate by 95 percent.
Chipping is a defect where the coating film chips off due to mechanical impact. It is particularly prone to occur in automotive parts, with cases of customer complaints arising from impacts in the usage environment after delivery accounting for 30-40 percent. Relationship between film thickness and chipping resistance: At a thickness of 20 microns, the film easily peels off under impact (damaged at an impact value of 30J), while at 30 microns, it withstands 60J, and at over 40 microns, it achieves impact resistance of over 150J. Designing the film thickness according to the application of the parts is essential. Quantifying adhesion: In cases of poor adhesion, even at a thickness of 40 microns, the impact value drops to 60J. By optimizing degreasing and chemical treatment to ensure adhesion, the impact resistance can be improved by more than double at the same film thickness. Influence of surface treatment: Maintaining a surface roughness Sa of 2-3 microns strengthens the mechanical interlocking with the coating film, improving chipping resistance by 30 percent. Optimizing shot blasting conditions is key. Our company combines film thickness management (40 plus or minus 5 microns), ensuring adhesion, and proper surface treatment to achieve a chipping occurrence rate of less than 0.5 percent. This has also been adopted in automotive parts.
Inquire About This Product
Related Videos
basic information
Film thickness management, adhesion management, substrate roughness, impact resistance.
Price range
Delivery Time
Applications/Examples of results
Chip prevention, durability enhancement
Company information
We are not just a "subcontracted painting factory." Established in 1958, our company has a foundation of painting technology and also specializes in chemical treatment, stripping, and cleaning, functioning as the "external surface treatment department" in your organizational chart. Based on our philosophy of "preparation is eight-tenths of the work," we emphasize participation from the "upstream process" before the drawings are finalized. We conduct test painting on a wide range of metals and difficult materials, and we produce the entire process from assembly, packaging, to delivery, thereby reducing your management workload. Additionally, by being able to perform zinc phosphate treatment in-house, we achieve stable painting quality. Furthermore, our micro-heating stripping technology, which does not use chemicals, maintains the electrical state of the "jigs (hangers)" that influence painting quality. Our approach of "pre-treatment determines painting quality" ensures the stability of the paint film during mass production. Rather than simply "applying specified standards," we work backwards to achieve optimal painting specifications and prevent scratches during transportation, sparing no effort in thorough discussions from the outset. This diligent preparation is the shortest path to preventing rework and minimizing total costs. From the development stage, please utilize the expertise of our specialists as part of your production line.
