Zairyo-to-Kankyo
Online ISSN : 1881-9664
Print ISSN : 0917-0480
ISSN-L : 0917-0480
Sacrificial Anode Cathodic Protection of Steel in Tap Water
Yoshikazu MiyataShukuji AsakuraYasuki MatsukawaMamoru MiyashitaToshihiko Sudo
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2005 Volume 54 Issue 10 Pages 488-493

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Abstract

Recently, cathodic protection is applied to steel in fresh water. This paper discusses the condition which satisfies cathodic protection in practical use.
A sacrificial anode is zinc. Steel being in contacted with zinc is dipped in Tsukuba-city tap water at 25°C for 780h. Weight loss, potential and cathodic current between zinc and steel are measured.
Steel does not corrode when the ratio of area [γ=area of steel/(area of steel+area of zinc)] is lower than 0.75. In this case, the cathodic current density to steel is more than 0.12A/m2 and the potential continues to rise. When steel corrodes, the potential attains the steady value of about -400mV (SHE). We propose the protection criterion considering both the potential and the direction of change of potential.

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© Japan Society of Corrosion Engineering
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