This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
TOPOGRAPHY ASSESSMENT OF COATED STEEL SHEET SURFACE IMPERFECTIONS IN RELATION TO APPEARANCE AFTER PAINTING
Technical Paper
2003-01-2766
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
This study examined the evolution of the surface topography of imperfections in response to painting. Critically-sized imperfections on industrially produced coated sheet steel surfaces were sampled, and carefully characterized. Changes in the surface topography were measured after painting simulations, and visibility after painting was assessed. Three-dimensional optical profilometry was demonstrated to be a powerful technique for assessing imperfection topographies and their evolution during painting; several imperfections that were completely invisible through human inspection after painting were still measurable by 3-D topography. Two primer surfacer systems were used, to compare a conventional liquid system with a high-build anti-chip powder system.
While most imperfections remained visible after e-coating, the results showed that many surface imperfections are rendered invisible after final top coating, and the results provide a basis for industry to begin developing measurement-based inspection criteria for imperfection severity. The powder primer surfacer system was found to be much more effective in attenuating imperfections. A simple model was hypothesized to understand topography evolution, based on film shrinkage during paint curing, with some important implications related to painting system variables.
Recommended Content
Technical Paper | Paint Finish in Automotive Bodies |
Technical Paper | WIzARD: Weld Inspection And Reporting Database Software development, implementation, and application |
Ground Vehicle Standard | Crane Boomstop |
Authors
Citation
Choi, Y., Chung, J., Speer, J., and Matlock, D., "TOPOGRAPHY ASSESSMENT OF COATED STEEL SHEET SURFACE IMPERFECTIONS IN RELATION TO APPEARANCE AFTER PAINTING," SAE Technical Paper 2003-01-2766, 2003, https://doi.org/10.4271/2003-01-2766.Also In
References
- “Classification of Common Imperfections in Sheet Steel,” SAE Handbook, Vol. 1: Materials SAE Warrendale, PA 1985 3.27 3.36
- Cermak G. W. “Objective Predictors of Paint Appeal,” Journal of Coatings Technology 57 January 1985 39 47
- Billmeyer, F.W. Jr. “Color and Appearance Characterization for the Coatings Industry,” Journal of Coating Industry 57 March 1985 47 53
- Hahn F.J. “Cratering and Related Phenomena,” Journal of Paint Technology 43 November 1971 58 67
- Orchard S.E. “The Flow of Paint Coatings: A Hydrodynamic Analysis,” Progress in Organic Coatings 23 1994 341 350
- Bastawros A.F. Speer J.G. Zerafa G. Krupitzer R.P. “Effects of Steel Surface Texture on Appearance After Painting” SAE Technical Paper No. 930032 SAE Warrendale, PA 14
- Jacobs H. Derule H. Bugnard F. “Control of Steel Appearance After Painting: Application to Hot Dip Galvanized Products,” Proceedings of 4 th International Conference on Zinc and Zinc Alloy Coated Steel Sheet (Galvatech '98) Chiba, Japan 1998 709 714
- Choi Y.M. “Topography Assessment of Coated Steel Surface Imperfections in Relation to Appearance After Painting,” Colorado School of Mines Golden, Colorado 2002