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Abstract

This report is concerned with the influence of the type and composition of automobile coatings on electrochemical deterioration occurring under the paint. First, different metallic coatings were characterized for their surface chemical (inherent) composition before phosphatation. Electrochemical measurements were conducted on metallic substrates before and after cataphoresis. Concurrently, metal substrates using the full coating system that were scratched down to the steel were evaluated in accelerated tests and at atmospheric corrosion test stations under marine and industrial conditions. Furthermore, several samples were studied in real-time using an electrochemical sensor in order to follow the in-situ deterioration of the system. Metallographic analyses were carried out on the painted samples after natural or accelerated aging. Macroscopic evaluation of the delamination around a defect by a new method based on image-analysis has been developed. This new tool represents an increase in efficiency of the estimation of delaminated surfaces. The results of this study have led to considerable progress in the validation and significance of accelerated corrosion tests, the understanding of deterioration mechanisms, the perfection of electrochemical tests, and the quantification of delamination.

Additional information

Authors: BARREAU C, Institut de recherches de la Sidérurgie française, Saint-Germain-en-Laye (FR);FATREZ P, Institut de recherches de la Sidérurgie française, Saint-Germain-en-Laye (FR);BLONDEAU J-P, Institut de recherches de la Sidérurgie française, Saint-Germain-en-Laye (FR);CHARBONNIER J-C, Institut de recherches de la Sidérurgie française, Saint-Germain-en-Laye (FR)
Bibliographic Reference: EUR 16666 FR (1997) 58pp., FS, ECU 10
Availability: Available from the (2)
ISBN: ISBN 92-828-0266-3
Record Number: 199710763 / Last updated on: 1997-06-23
Category: PUBLICATION
Original language: fr
Available languages: fr