A holistic mathematical modelling and simulation for cathodic delamination mechanism – a novel and an efficient approach

Abstract

This paper addresses a holistic mathematical design using a novel approach for understanding the mechanism of cathodic delamination. The approach employed a set of interdependent parallel processes with each process representing: cation formation, oxygen reduction and cation transport mechanism, respectively. Novel mathematical equations have been developed for each of the processes based on the observations recorded from experimentation. These equations are then solved using efficient time-iterated algorithms. Each process consists of distinct algorithms which communicate with each other using duplex channels carrying signals. Each signal represents a distinct delamination parameter. As a result of interdependency of various processes and their parallel behaviour, it is much easier to analyse the quantitative agreement between various delamination parameters. The developed modelling approach provides an efficient and reliable prediction method for the delamination failure. The results obtained are in good agreement with the previously reported experimental interpretations and numerical results. This model provides a foundation for the future research within the area of coating failure analysis and prediction.

A review of theoretical analysis techniques for cracking and corrosive degradation of film-substrate systems

“…Khan-Nazir [17], recently developed an efficient time iterative model and showed that the concentration of cations (e.g. Na + in NaCl solution) and their transport significantly affect the debonding of film-substrate system thus deciding delamination rate.…”

“…In the case of cathodic delamination, separation of the film is linked to the cathodic reaction in a localized corrosion cell. As such, cathodic delamination [17,129,130] is closely related to the phenomena of cathodic blistering [16,18,21]. Tribocorrosion degradation is linked to the mechanical wear and the electrochemical corrosive degradation of films.…”

“…The corrosion resistance, tribological performance and film characteristics have been reported [10][11][12][13]. The crystalline structure of film materials and thin film porosity are not subjects of this review as the phenomenon of corrosion diffusing species through micro cracks in thin films have been reported [14][15][16][17][18][19][20][21] in detail.…”

Analysing the coupled effects of compressive and diffusion induced stresses on the nucleation and propagation of circular coating blisters in the presence of micro-cracks

“…Pervious research has analysed [36][37][38][39][40][41][42][43][44][45] coating substrate system without the inclusion of micro-cracks. However, this research aims to analyse the coupling effects of residual and diffusion induced stresses on blister growth in the presence of coating micro-cracks.…”

A comprehensive predictive corrosion model incorporating varying environmental gas pollutants applied to wider steel applications

“…blistering, delamination, micro-cracks and corrosion damage measurement in real time has been reported [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Recently a simplistic model of variation in environmental parameters to understand the effects of changing relative humidity and temperatures in terms of corrosion initiation and propagation on bare steel samples has been published [8].…”