Three points for pre-treatment to prevent poor adhesion of aluminum die-cast coating.
Peeling of aluminum die-cast paint occurs due to insufficient management of oil content, voids, and surface conditions.
■Cause of Occurrence: Poor adhesion of aluminum die casting is judged to be weak and easily peeling paint. The causes are not only the paint itself but also the residual oil from casting and processing, the presence of pores and gas escape on the material surface, and the surface condition after pretreatment. It is a material that tends to retain dirt and moisture in complex shapes, particularly around holes, corners, and ribs. ■Truth: It is difficult to detect at the time of shipment, and if oil or moisture remains under the paint film, it will peel off due to assembly or transport vibrations. In areas with pores, it can develop into pinholes or blisters. The quality of the paint is almost determined by the management before application. ■Improvement Measures: By confirming the three points of degreasing to remove oil, ensuring no moisture remains after cleaning, and checking for pores and roughness at each process, it can be recorded in the lot records to prevent recurrence. Please utilize materials that can confirm pretreatment, material condition, and film thickness conditions.
basic information
Confirmation of 3 management points: oil separation, nesting holes and gas escape, surface condition after pretreatment / Corresponding material: aluminum die casting / Key areas: holes, corners, and rib areas / Simultaneous measures for poor adhesion, pinholes, and blisters / Lot record management
Price range
Delivery Time
Applications/Examples of results
Aluminum die casting, automotive parts, complex shape parts
Related Videos
catalog（1）
Download All Catalogs
Distributors
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.