TY - JOUR
T1 - Corrosion behavior and mechanism of the automotive hot-dip galvanized steel with alkaline mud adhesion
AU - Zhang, Hong
AU - Li, Xiao gang
AU - Du, Cui wei
AU - Qi, Hui bin
PY - 2009/8
Y1 - 2009/8
N2 - The corrosion behavior and mechanism of hot-dip galvanized steel and interstitial-free (IF) substrate with alkaline mud adhesion were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and linear polarization. The results show that non-uniform corrosion occurs on the galvanized steel and IF substrate during 250 h with the mud adhesion. The corrosion products on the galvanized steel are very loose and porous, which are mainly ZnO, Zn5(OH)8Cl2·H2O and Zn(OH)2, and Fe-Zn alloy layer with a lower corrosion rate is exposed on the galvanized steel surface; however, the corrosion products on IF substrate are considerably harder and denser, whose compositions of rust are mainly FeOOH and Fe3O4, and several pits appear on their surface. The results of continuous EIS and linear polarization measurements exhibit a corrosion mechanism, that is, under activation control, the charge transfer resistances present different tendencies between the galvanized steel and IF substrate; in addition, the evolution of linear polarization resistances is similar to that of charge transfer resistances. The higher contents of dissolved oxygen and Cl- ions in the mud play an important role in accelerating the corrosion.
AB - The corrosion behavior and mechanism of hot-dip galvanized steel and interstitial-free (IF) substrate with alkaline mud adhesion were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and linear polarization. The results show that non-uniform corrosion occurs on the galvanized steel and IF substrate during 250 h with the mud adhesion. The corrosion products on the galvanized steel are very loose and porous, which are mainly ZnO, Zn5(OH)8Cl2·H2O and Zn(OH)2, and Fe-Zn alloy layer with a lower corrosion rate is exposed on the galvanized steel surface; however, the corrosion products on IF substrate are considerably harder and denser, whose compositions of rust are mainly FeOOH and Fe3O4, and several pits appear on their surface. The results of continuous EIS and linear polarization measurements exhibit a corrosion mechanism, that is, under activation control, the charge transfer resistances present different tendencies between the galvanized steel and IF substrate; in addition, the evolution of linear polarization resistances is similar to that of charge transfer resistances. The higher contents of dissolved oxygen and Cl- ions in the mud play an important role in accelerating the corrosion.
KW - adhesion
KW - corrosion mechanism
KW - galvanized steel
KW - interstitial-free (IF) steel
KW - mud
UR - https://www.scopus.com/pages/publications/68749085961
U2 - 10.1016/S1674-4799(09)60073-X
DO - 10.1016/S1674-4799(09)60073-X
M3 - 文章
AN - SCOPUS:68749085961
SN - 1674-4799
VL - 16
SP - 414
EP - 421
JO - International Journal of Minerals, Metallurgy and Materials
JF - International Journal of Minerals, Metallurgy and Materials
IS - 4
ER -