Why does the paint peel off immediately? A review of the three pre-treatment processes to stop poor adhesion.
The peeling of paint is not just a problem with the paint itself, but is determined by the accumulation of degreasing, cleaning, and drying processes.
■Cause of Occurrence: Paint peeling is a defect that tends to be discovered during the assembly process at the customer's site. Even if the surface is clean at the time of delivery, it can peel off due to bolt tightening or friction during transport. The three processes to check are whether the degreasing has effectively removed oil, whether there are any residues left after cleaning, and whether moisture has been eliminated during drying. If any one of these processes fails, the adhesion strength will decrease. ■Truth: Peeling is not an issue that occurs at the moment of painting, but rather a defect that surfaces later due to inadequate pretreatment. Changing the paint or curing conditions will not resolve the issue if oil or moisture remains. The adhesion conditions differ for aluminum, iron, and zinc plating. ■Improvement Measures: Instead of only addressing the areas that have peeled, it is important to revert to the state before painting and manage records of oil content, surface roughness, chemical conversion coating, drying conditions, and storage time. Treating pretreatment as the entry point for quality assurance is crucial. Please utilize documentation that allows you to verify pretreatment, film thickness, and curing conditions.
basic information
Confirmation of 3 processes: Degreasing, Cleaning, Drying / Applicable materials: Aluminum, Steel, Zinc-plated items / Management items: Oil content, Surface roughness, Chemical conversion coating, Drying condition, Storage time / Adhesion test: Grid test (JIS K 5600) compliant
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Automotive parts, assembly parts, construction hardware, industrial machinery
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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.