Use of the Goniophotometer for Scratch and Mar Testing of Automotive Topcoats 970998
The presence of marred and scratched areas detract from the appearance of current automotive topcoat systems. Although the final determination of the extent of the damage to the paint surfaces must be made by human visual evaluation, machine estimation of this damage has value in being a tool for screening large numbers of different paint technologies. Scattered light from marred regions (both single and multiple scratches) in an automotive basecoat/clearcoat system was generated and collected in a goniophotometer. The areas under the intensity/angle curves were obtained using an extended trapezoidal rule for numerical integration. This technique shows promise in correlating goniophotometric data with human evaluation of marred areas. This technique may be of value in screening different paint technologies and chemistries.
Citation: Cheever, G., Ottaviani, R., and Iyengar, V., "Use of the Goniophotometer for Scratch and Mar Testing of Automotive Topcoats," SAE Technical Paper 970998, 1997, https://doi.org/10.4271/970998. Download Citation
Author(s):
G. Dale Cheever, Robert A. Ottaviani, Vardarajan R. Iyengar
Affiliated:
General Motors Research and Development Center
Pages: 15
Event:
International Congress & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Coatings, colorants, and finishes
Tools and equipment
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