Skip to main content

Advanced testing procedures for high performance coatings


In the first part of this work, an integrated approach incorporating electrochemical (electrochemical impedance spectroscopy), calorimetric (differential scanning calorimetry), mechanical (dynamic mechanical thermal analysis), and infrared spectroscopy (Fourier transform infrared spectroscopy) techniques was used to characterize some organic coatings from the automotive industry. Comparison of the results obtained with different techniques allows not only a higher precision in the evaluation of natural or artificial degradation, which is very difficult to obtain using traditional techniques, but also better data interpretation and, therefore, the possibility of understanding the different degradation mechanisms.

In the second part, some preliminary results concerning the comparison of salt spray exposure and EIS measurements are discussed. The statistical analysis of the results showed that the degradation mechanism in the two cases is completely different and, therefore, the information which is obtained with the two testing approaches is also different. With EIS measurements obtained in immersion, it is possible to monitor, in particular, the barrier properties of the coatings, which are dominated by the presence of defects. In the case of salt spray (without scratch), the main property to be measured is the loss of adhesion which causes blister formation.

This is a preview of subscription content, access via your institution.


  1. Bauer, D.R., “Chemical Criteria for Durable Automotive Topcoats,”Journal of Coatings Technology,66, No. 835, 57 (1994).

    CAS  Google Scholar 

  2. Wernståhl, K.M. and Carlsson, B., “Durability Assessment of Automotive Coatings—Design and Evaluation of Accelerated Tests,”Journal of Coatings Technology,69, No. 865, 69 (1997).

    Article  Google Scholar 

  3. Deflorian, F., Fedrizzi, L., and Rossi, S.,Corrosion, 54, 598 (1998).

    CAS  Google Scholar 

  4. Wind, M.M. and Lenderink, H.J.W.,Prog. Org. Coat., 28, 239 (1996).

    Article  CAS  Google Scholar 

  5. Deflorian, F., Fedrizzi, L., and Bonora, P.L.,Br. Corros. J. 32, 145 (1997).

    CAS  Google Scholar 

  6. Deflorian, F., Fedrizzi, L., and Bonora, P.L.,Corros. Sci. 38, 1697 (1996).

    Article  CAS  Google Scholar 

  7. Lindqvist, S.A.,Corrosion, 41, 69 (1985).

    CAS  Google Scholar 

  8. Appelman, B.R., “Survey of Accelerated Test Methods for Anti-Corrosive Coating Performance,”Journal of Coatings Technology,62, No. 787, 57 (1990).

    Google Scholar 

  9. Timmins, F.D.,J. Oil & Colour Chemists’ Assoc., 62 (1979) 131.

    CAS  Google Scholar 

  10. Skerry, B.S. and Simpson, C.H.,Corrosion, 49, 663 (1993).

    CAS  Article  Google Scholar 

  11. Deflorian, F., Fedrizzi, L., Rossi, S., and Bonora, P.L.,Mat. Sci. Forum, 289–292, 337 (1998).

    Article  Google Scholar 

  12. Boukamp, B.,Solid State Ionics, 20, 31 (1986).

    Article  CAS  Google Scholar 

  13. Deflorian, F., Fedrizzi, L., Rossi, S., and Bonora, P.L.,Electrochim. Acta, 44, 4243 (1999).

    Article  CAS  Google Scholar 

  14. Maitland, C.C. and Mayne, J.E.O., “Factors Affecting the Electrolytic Resistance of Polymer Films,”Official Digest,34, No. 452, 972 (1962).

    CAS  Google Scholar 

Download references

Author information

Authors and Affiliations


Additional information

Dept. of Materials Engineering, Via Mesiano 77, Trento, Italy. e-mail:;;

Dept. ICMMPM, Via Eudossiana, Rome, Italy. e-mail:

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Deflorian, F., Rossi, S., Bonora, P.L. et al. Advanced testing procedures for high performance coatings. Journal of Coatings Technology 72, 81–87 (2000).

Download citation

  • Issue Date:

  • DOI:


  • Electrochemical Impedance Spectroscopy
  • Dynamic Mechanical Thermal Analysis
  • Barrier Property
  • Salt Spray
  • Organic Coating