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The use of AC impedence to determine the corrosion rate of electrogalvanized steel.

Authors
Dattilo-M
Source
Mater Perform 1986 Nov; 25(11):18-22
NIOSHTIC No.
10007225
Abstract
This paper presents Bureau of Mines research into the corrosion rate of industrial electrogalvanized steel in deaerated molar ammonium sulfate by DC and ac electrochemical techniques as compared to solution analysis by atomic adsorption. An evaluation of the zinc coatings obtained in an industrial-scale test has shown that coatings obtained from a waste-derived electrolyte perform better than normal industrial coating. Impedance diagrams show that a slightly different frequency distribution is obtained for the two different coatings studied. The time dependence of the zinc corrosion rate can be monitored using impedance data over a frequency range of 0.1 to 11 hz. Admittance plots provided the double-layer capacitance values, which indicate the presence or absence of surface corrosion products. The results show that electrochemical ac techniques can be applied to successfully determine the zinc corrosion rate of electrogalvanized steel in near- neutral media and that waste sources of zinc are viable for electrogalvanizing steel.
CODEN
MTPFBI
Publication Date
19861101
Document Type
OP; Journal Article
Fiscal Year
1987
NTIS Accession No.
NTIS Price
Identifying No.
OP 171-86
Issue of Publication
11
ISSN
0094-1492
NIOSH Division
RORC
Source Name
Materials Performance
State
MO
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