Recent emphasis in marine cathodic protection studies has focused on the slope parameter approach to polarization data representation according to the relationship phic=(RtxAc)ic + phia where phic and ic are cathode potential and current density, respectively, phia is anode potential, Rt is total circuit resistance, and Ac is cathode area. In conjunction with the rationale represented by this expression, a series of galvanic anode cathodic protection experiments was performed, which involved a dual magnesium-aluminium anode, application of adequate cathodic protection to specimens that initially were underprotected, and depolarization of a specimen that was well protected initially. In each case, the data were analyzed in terms of above expression to characterize the polarization path (i.e., the phi-i history) that transpired prior the final polarized state being reached. Results were compared than in effort to recognize the effect of different polarization/depolarization processes upon the effectiveness and efficiency of cathodic protection of offshore structures.
Path dependence of the potential-current density state for cathodically polarized steel in seawater
Wegabhängigkeit der Potential-Stromdichte-Charakteristik für kathodisch polarisiertem Stahl in Meerwasser
Corrosion, Houston ; 56 , 1 ; 3-11
2000
9 Seiten, 14 Bilder, 24 Quellen
Aufsatz (Zeitschrift)
Englisch
kathodischer Korrosionsschutz , Aluminiumanode , Polarisationskurve , elektrochemische Grundlage , elektrochemische Polarisation , Depolarisation , unlegierter Stahl , Meereskonstruktion , Meerwasser , Potenzialzeitkurve , Stromdichte , elektrochemisches Potenzial , Innenwiderstand , Magnesiumaluminiumlegierung
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