The stochastic model of pitting corrosion of metals

6th Global Conference on Materials Science and Engineering

You, Y.H.^1 ; Wang, B.R.^1 ; Hu, H.Y.^1

School of Physics, Beijing Institute of Technology, Beijing

100081, China^1

关键词: Failure Probability;    Growth process;    Non equilibrium;    Pitting lives;    Statistical theory;    Stochastic theories;    Time evolution equations;    Weakest-link models;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/283/1/012012/pdf
DOI  :  10.1088/1757-899X/283/1/012012

来源: IOP

【 摘 要 】

Considering that pitting corrosion is a stochastic process, the purpose of this paper is to use stochastic theory to investigate the growth process of pitting corrosion of metals. Based on the mechanism of pit growth and nonequilibrium statistical theory, the time evolution equations of pit depth and corrosion rate are obtained, and the probability density function can be derived by solving Fock-Plank Equation. Subsequently, the failure probability or reliability of metals is calculated based on the weakest link model of pitting corrosion. Finally, the stochastic model is used on the aircraft aluminum alloy LD2. Furthermore, this methodology can be applied to analyze the reliability and predict the pitting life of metals.