The base material is unharmed, but only the area around the bead has the paint film lifting. We will stop the peeling of the weld area with the removal procedure for spatter and scale.
Only the welded parts have the paint film peeling around the bead. Why does it peel off only in that area when the base material is unharmed? ────────────── ■Cause of occurrence Welded areas retain spatter and black oxide scale. Since the scale itself is detached from the base material, it peels off along with the paint film. ■Truth The adhesion strength of the oxide scale is less than one-tenth of that of a healthy base material surface. A pre-treatment line that only degreases will not remove the scale. Even a thin oxide film that is not visibly black can be a starting point for peeling. ■Improvement measures Spatter should be mechanically removed, and the scale must be reliably removed by acid pickling or blasting. Flow into pre-treatment within 24 hours after welding to prevent re-rusting and moisture absorption. Please utilize the materials summarizing the pre-treatment conditions for welded structures.
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basic information
Compatible materials: Iron, stainless steel, aluminum / Pre-treatment: Degreasing, pickling, shot blasting, zinc phosphate coating / Coating thickness: 20-40 microns / Curing temperature: 140-200 degrees / Maximum compatible dimensions: 2000mm
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Applications/Examples of results
Metal baking paint for welded structures such as construction machinery frames, industrial machine covers, railway vehicle parts, and agricultural machinery. We have a track record of reviewing pre-treatment conditions as a countermeasure against peeling complaints from welded joints.
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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.
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