It was monitored the dissolution process of 1018 steel in simulated cooling water during the transient and steady state conditions with time. Dissolution and growth of corrosion product layers were following using a linear flow cell and flow magnetic-induced cell. By using Electrochemical Impedance Spectroscopy, it was analyzed the dissolution and inhibition process. The growth of a layer when adding hydroxyphosphonoacetic acid, inhibits metal dissolution and it presents two different influences at the interface for impedance response. They showed that new layer forms in a simple array depending on the flow regimen and the hydroxypphosphonoacetic group added to the surface. After stabilization time of 5 hours in absence of inhibitor, continuous growth and dissolution of a layer changed the electrical characteristics for the scaling and corrosion product due to flow regimen. Electrical passive elements described qualitatively the characteristics of the layer formation due to inhibitor addition
This paper presents the results of the interfacial evolution of 1018 steel exposed to artificial cooling water in presence of two different environments: the oxygen content and the 1,2-hydroxyphosphonoacetic acid (HPA). The aerated solution in presence of HPA supported two processes; the first was the sequestration of calcium ions with the subsequent complexation of the calcium carbonate (CaCO 3); the second was the precipitation of a layer formed mainly by hematite (Fe 2 O 3) mixed with CaCO 3 and phosphorous-based compounds. Conversely, de-aerated conditions in the absence of HPA lead to the formation of a combination of iron oxides (Fe 3 O 4 + Fe 2 O 3) at the surface of the steel. The HPA addition in deaerated solution produced the formation of plate shape phosphorous-based layer with a mixture of iron oxides (Fe 3 O 4 + Fe 2 O 3). In this work, we could characterize the evolution of the corrosion products layers by Electrochemical Impedance Spectroscopy (EIS) measurements and electrical passive circuits. The continuous EIS results helped to establish interfacial mechanisms of the HPA used as inhibitor and de-aerated (oxygen low content) conditions simulating the presence of oxygen scavengers.
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