Wire beam electrode technique for investigating galvanic corrosion behavior of hot--dip galvanized steel--scratch defect

Chin J Mater Res

2009, Vol. 23

Issue (4): 343-346 DOI:

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Wire beam electrode technique for investigating galvanic corrosion behavior of hot--dip galvanized steel--scratch defect

ZHANG Dalei ¹; WANG Wei ³; LI Yan ¹

1.Institute of Oceanology; Chinese Academy of Sciences; Qingdao 266071
2.Graduate School of the Chinese Academy of Sciences; Beijing 100039
3.College of Chemistry and Chemical Engineering; Ocean University of China; Qingdao 266100

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ZHANG Dalei WANG Wei LI Yan. Wire beam electrode technique for investigating galvanic corrosion behavior of hot--dip galvanized steel--scratch defect. Chin J Mater Res, 2009, 23(4): 343-346.

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Abstract

In order to obtain the spatial distribution and its variation with time during the galvanic corrosion of hot dip galvanized steel if scratches occurred in the zinc coating, the heterogeneous wire beam electrode composed of zinc and mild steel wires was developed, and then the potential and current distributions of this electrode were acquired at different time. The results showed that zinc wires can provide enough cathodic protection to steel wires in seawater when surface area of zinc wires is ten times that of steel wires. The potential and current distributions were inhomogeneous among the zinc wires. The similar heterogeneous phenomenon also presented among the steel wires, and the hydrogen evolution occurred on their surfaces.

Key words: materials failure and protection wire beam electrode carbon steel cathodic protection zinc coating hydrogen evolution

Received: 09 January 2009

ZTFLH:	TB304
	TG172

Fund:

Supported by the National Natural Science Foundation of China No.40576038, the Doctor Foundation No.2006BS07008 and the Natural Science Foundation in Shandong No.Y2008E09.

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