In order to develop a new corrosion sensor for detecting and monitoring the corrosion of buried pipelines, sensor element design and the correlation of its output to the corrosion rate of steel pipe were evaluated by laboratory test methods in synthetic groundwater. The sensor uses well-known principles of galvanic corrosion and consists of two dissimilar metals (anode and cathode) installed in the soil on the pipelines. In this paper, two types of electrochemical probes were used: pipeline steel-copper and pipeline steel-stainless steel (Type 304 [UNS S30400]) galvanic ceils. The corrosion behavior in synthetic groundwater for the different electrodes was investigated using a potentiodynamic test. Weight-loss and galvanic corrosion tests were conducted to obtain the correlation between the galvanic current and corrosion rate. The results of the potentiodynamic test indicated that pipeline steel and copper exhibited active corrosion behavior, but stainless steel demonstrated spontaneous passivation. In galvanic corrosion tests, the galvanic current of a copper-steel couple was higher than that of other couples. The comparison of the sensor output and corrosion rates revealed that a linear relationship was found between the probe current and the corrosion rates.
A galvanic sensor for monitoring the corrosion damage of buried pipelines. Part 1: Electrochemical tests to determine the correlation of probe current to actual corrosion damage in synthetic groundwater
Ein galvanischer Sensor zur Überwachung der Korrosionsschädigung von unterirdischen Rohrleitungen. Teil 1: Elektrochemische Versuche zur Bestimmung des Verhältnisses von Probenstrom zu aktueller Korrosionsschädigung in künstlichem Grundwasser
Corrosion, Houston ; 61 , 3 ; 293-301
2005
9 Seiten, 15 Bilder, 1 Tabelle, 25 Quellen
Aufsatz (Zeitschrift)
Englisch
unterirdische Rohrleitung , Sensor elektrischer Größen , galvanischer Strom , elektrochemische Korrosion , Schadenverhütung , Überwachung , Stahlrohr , Korrosionselement , Grundwasser , Gewichtsverlust , Korrosionsstrom , Korrosionsgeschwindigkeit , Passivierung , Impedanzspektrometrie , Polarisationskurve , Chrom-Nickel-Stahl , Korrosionsüberwachung
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