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Towards a practical metric of surface gloss for metallic coatings from automotive industry

  • Mengting Wu
  • Haisong XuEmail author
  • Zhehong Wang
  • Haifeng Li
Article

Abstract

The specular gloss of metallic coatings from the automotive industry can be well measured by current glossmeters when the geometry is appropriately chosen from 20°, 60°, and 85° based on the gloss levels observed. However, the measurements are discontinuous and even nonmonotonic at the breakpoints dividing samples into different gloss levels in the whole range, which causes confusion and inconvenience for industry applications. In this study, attempts were made to link the measurements at the three geometries to be continuous monotonically and in the meanwhile to improve the accuracy of estimating visual gloss. A psychophysical experiment based on a magnitude method was carried out to assess the gloss of metallic coatings with different colors and textures. The visually scaled gloss data were compared with spectrophotometric measurements and instrumental specular gloss values under different geometries. With different weighing coefficients for measurements at individual geometries depending on the gloss levels, a model was proposed to describe the visual surface gloss of metallic coatings comprehensively via a practical metric based on the geometry-dependent measurements. In this way, each sample would have a unique overall gloss value highly correlated with its perceptual evaluation over the entire gloss range.

Keywords

Gloss Metallic coatings Visual assessment Glossmeter Practical metric 

Notes

Acknowledgments

This work was supported by the National Basic Research Program of China under Grant No. 2013CB328802.

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Copyright information

© American Coatings Association 2016

Authors and Affiliations

  • Mengting Wu
    • 1
  • Haisong Xu
    • 1
    Email author
  • Zhehong Wang
    • 2
  • Haifeng Li
    • 1
  1. 1.State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and EngineeringZhejiang UniversityHangzhouChina
  2. 2.Hangzhou Institute of Test and Calibration for Quality and Technology SupervisionHangzhouChina

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