Corrosion behaviour of galvanized steel studied by electrochemical microprobes applied on low-angle cross sections

Citation:

Manhabosco SM, Manhabosco TM, Geoffroy N, Vignal V, Dick LFP. Corrosion behaviour of galvanized steel studied by electrochemical microprobes applied on low-angle cross sections. Corrosion Science [Internet]. 2018;140 :379 - 387.

Abstract:

The combined use of the microcapillary cell (MEC) and scanning vibrating electrode technique (SVET) and low-angle cross sections was employed to elucidate the role of each coating region on the protection of the cut-edge corrosion of galvanized steels. Different compounds are involved in the blocking action of the corrosion products: Zincite (ZnO) on the steel substrate, hydrozincite (Zn5(OH)6(CO3)2) at the coating/steel interface, and Simonkolleite (Zn5(OH)8Cl2) and ZnO on the different coating regions in different proportions. The coating surface is also active at the initial stage and during long-term protection and thus, must be considered in experimental simulation of the cut-edge corrosion.

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Last updated on 04/01/2019