Evaluation of the critical stress of anodized coating-AZ91D substrate using SEM in-situ technology

Experimental investigations of the micro cracking behavior of a coating-substrate structure were carried out in-situ with a scanning electron microscope (SEM). An anodized coating layer was deposited on an AZ91D substrate by the galvanize pulse method. Results indicated that the failure mechanism of...

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Bibliographic Details
Published in:Journal of Zhejiang University. A. Science 2016-01, Vol.17 (1), p.65-75
Main Authors: Wang, Xi-shu, Guo, Xing-wu, Nakamura, Yuzo, Yang, Hui-hui, Pan, Pan
Format: Article
Language:English
Subjects:
Axial stress
Civil Engineering
Classical and Continuum Physics
Coating
Coatings
Deformation
Deformation mechanisms
Digital imaging
Engineering
Evaluation
Failure mechanisms
Galvanizing
Industrial Chemistry/Chemical Engineering
Mathematical models
Mechanical Engineering
Scanning electron microscopy
Spalling
Substrates
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Summary:Experimental investigations of the micro cracking behavior of a coating-substrate structure were carried out in-situ with a scanning electron microscope (SEM). An anodized coating layer was deposited on an AZ91D substrate by the galvanize pulse method. Results indicated that the failure mechanism of the coating-substrate structure was due to a mismatch of micro deformation between the coating and substrate. The micro deformations induced by different failure models were cracking, spalling, or delamination. The failure models were validated using theoretical, experimental, and digital image correlation methods. The critical stress of failure can be evaluated by measuring the biaxial stress.
ISSN:1673-565X
1862-1775
DOI:10.1631/jzus.A1500178