Modeling the effect of residual and diffusion-induced stresses on corrosion at the interface of coating and substrate

Authors: Nazir, H., Khan, Z., Saeed, A. and Stokes, K.

http://eprints.bournemouth.ac.uk/23248/

http://corrosionjournal.org/doi/abs/10.5006/1804

Journal: CORROSION Journal

Volume: 72

Issue: 4

Pages: 500-517

Publisher: NACE

eISSN: 1938-159X

ISSN: 0010-9312

DOI: 10.5006/1804

The effect of residual and diffusion induced stresses on corrosion at the interface of coating and substrate has been analysed within a multidisciplinary approach i.e. material science, solid mechanics and electrochemistry. A self-consistent equation for corrosion current density, involving the combined effect of residual stress and diffusion induced stress is developed. The influences of temperature, moduli ratio, thickness ratio, thermal mismatch ratio and residual stress gradient of coating and substrate on the corrosion current density are then discussed. Results indicate that when the thermal expansion of coating is greater than substrate, the decrease in temperature from fabrication temperature accounts for the same direction of both the residual and the diffusion stresses. This behaviour increases the deflection of coating-substrate system and results in the evolution of tensile residual stress in the coating. The tensile stress opens the pre-existing coating micro crack allowing the diffusion of corrosive agents and therefore, accelerating the corrosion damage to the coating-substrate interface. The model is based on experimental observations conducted to understand the behaviour of corrosion at the coating-substrate interface in the presence of tensile or compressive residual stresses. At the end the model has been validated against the experimental results showing a good quantitative agreement between the predicted theoretical and experimental trends

This data was imported from Scopus:

Authors: Nazir, M.H., Khan, Z.A., Saeed, A. and Stokes, K.

http://eprints.bournemouth.ac.uk/23248/

Journal: Corrosion

Volume: 72

Issue: 4

Pages: 500-517

ISSN: 0010-9312

DOI: 10.5006/1804

© 2016, NACE International. The effect of residual and diffusion-induced stresses on corrosion at the interface of coating and substrate has been analyzed within a multidisciplinary approach, i.e., material science, solid mechanics, and electrochemistry. A self-consistent equation for corrosion current density, involving the combined effect of residual stress and diffusion-induced stress is developed. The influences of temperature, moduli ratio, thickness ratio, thermal mismatch ratio, and residual stress gradient of coating and substrate on the corrosion current density are then discussed. Results indicate that when the thermal expansion of coating is greater than substrate, the decrease in temperature from fabrication temperature accounts for the same direction of both the residual and the diffusion stresses. This behavior increases the deflection of the coating-substrate system and results in the evolution of tensile residual stress in the coating. The tensile stress opens the pre-existing coating microcrack, allowing the diffusion of corrosive agents and therefore, accelerating the corrosion damage to the coating/substrate interface. The model is based on experimental observations conducted to understand the behavior of corrosion at the coating/substrate interface in the presence of tensile or compressive residual stresses. At the end, the model was validated against the experimental results showing a good quantitative agreement between the predicted theoretical and experimental trends.

This data was imported from Web of Science (Lite):

Authors: Nazir, M.H., Khan, Z.A., Saeed, A. and Stokes, K.

http://eprints.bournemouth.ac.uk/23248/

Journal: CORROSION

Volume: 72

Issue: 4

Pages: 500-517

eISSN: 1938-159X

ISSN: 0010-9312

DOI: 10.5006/1804

The data on this page was last updated at 04:57 on June 24, 2019.