三价铬基转化膜生长动力学研究现状及进展
王来滨, 刘侠和, 王梅, 高俊杰

Research Status and Progress on Growth Kinetics of Trivalent Chromium-based Conversion Film
WANG Laibin, LIU Xiahe, WANG Mei, GAO Junjie
表2 钝化膜生长模型的主要特点总结[55-62]
Table 2 Summary of the main characteristics of the growth models for passive film[55-62]
Model

CMM[55-57]

(air phase formation)

FMM[58,59]

(air phase formation)

PDM[60-62]

(electrochemical formation)

Oxide growth mechanismMigration of interstitial cationsMigration of interstitial anionsMigration of anion vacancies
Growth law

Weak Electric Field: L2=εLt

Strong electric field:

1/L=A-Blnt1/L

Activation energy function of thickness L=Cln(1+Dt)Transport controlled:L=(1/2K)[ln2Ka(b-1)+lnt] Interface controlled:L=Lt=0+(1/b)ln[1+abtexp(-bLt=0)]
Electric FieldεL=V/LIndependent of LIndependent of L
Limiting Growth Step

Weak electric field:

Transport of cations through the film Strong electric field:

Cation injection at m/f interface

Anion transport through the film

Transport controlled:

Oxygen vacancies through film

Interface controlled:

Anion vacancy injection at m/f interface

Dissolutionn/an/aDissolution of metal dissolution of oxide
Interfacial potential dropn/an/aFunction of pH and Vext