Under-deposit Occluded Cell Corrosion Inhibition Mechanism of N80 Steel in NaCl Solution Added with Sodium Laurate
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Abstract
Using a simulated occluded corrosion cell(OCC),the inhibition mechanism of sodium laurate (C12H23O2Na) preventing from the underdeposit occluded cell corrosion of N80 steel in 0.2 mol/L NaCl solution was studied by electrochemical methods,including measurements of coupling currents,polarization resistance,electrochemical impedance spectroscopy(EIS).The results showed that C12H23O-2 could migrate into the occluded cavity through the deposition and adsorption on the N80 steel surface in NaCl solution,which increased the polarization resistance of the occluded anode and the bulk cathode,obstructing both the anodic and cathodic processes.Due to the adsorption of C12H23O-2 on the deposited layer,the resistance of deposited layer increased markedly so as to prevent ions from migrating through the scale layer.All these effects resulted in inhibition of the underdeposit corrosion of N80 steel.
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