Exfoliation Corrosion and Pitting Corrosion and Their Role in Fatigue Predictive Modeling: State-of-the-Art Review

Table 5

Adsorption-induced mechanisms.

	Proposed by	Summary	Description	Limitations
1	Uhlig et al. [92] 1950–69, Kolotyrkin 1961 [95], Hoar 1967 [58]	(i) Proposed concepts based on either competitive adsorption or surface complex ion formation.	(i) In competitive adsorption mechanism Cl^− anions and passivating agents are simultaneously adsorbed. Above a critical potential Cl^− adsorption is favored resulting in the breakdown of passivity.; (ii) Kolotyrkin suggested that there were critical Cl^−/inhibitor concentration ratios, depending on the potential above which pitting would occur.	Occurrence of induction times varying with passive film thickness cannot be explained.
2	Sato 1982 [63, 64]	(i) Proposed a theoretical concept based on the potential dependent transpassive dissolution which depends on the electronic properties of the passive film.; (ii) The electrochemical stability of a passive film depends strongly on the “electron energy band structure” in the film.	(i) Stated that the critical potential above which potential-dependent dissolution of the film occurs will be less noble at the sites of chloride ion adsorption.; (ii) As a result of the increased dissolution rate above the critical potential, local thinning of the passive films occurs until a steady state is reached.; (iii) Proposed that the local thinning of the oxide film as a mechanism of pit “initiation”.; (iv) Included the effect of dislocations similar to the influences of Cl^− ions.	Knowledge of the electronic properties of passive films has not been fully understood.; Experimental evidence for this mechanism is lacking.