Therefore, the corrosion system changes its state from active to passive. Conclusion Passive metal corrosion system can be treated as a two stable steady-state nonlinear dynamics system. Due to the process of absorption-desorption of the absorbents, noise with large enough energy can be produced, and the absorption of reduction agents can also change the shape of cathodic polarization curve, this equals to a perturbation signal to the system. Because of the coherent effect among the system, signal and noise, stochastic resonance may take place. Therefore, the formation of the passive state of metal corrosion system may be due to this kind of effect.
Experimental verifications are now under considering.
It is certain that the study of the effect of stochastic force to the nonlinear system can be a help in the research of metal corrosion.