Abstract
In this paper, the behavior of corrosion in phosphated galvanized steel without defect and with surface defect is evaluated in electrolyte solutions of sodium chloride at a concentration of 3% and sodium sulfate 0.1 M with the objective of simulating the marine environment with presence of chlorides, and sulfates for the industrial environment. In the experimental methodology, samples of phosphated galvanized steel are used, each of the samples were exposed in the electrolyte of sodium chloride at a concentration of 3% and 0.1 M sodium sulfate. The phosphated galvanized steel was evaluated with electrochemical techniques Lineal Polarization Resistance, Electrochemical Impedance Spectroscopy and Potentiodynamic Curves in order to study and predict the corrosion behavior that can be obtained according to the type of electrolyte. Regarding the final result in both cases, both for the plate with defect and without defect, a greater effect of corrosion was observed in galvanized steel exposed in NaCl compared to Na2SO4. Phosphate protection influenced the corrosive processes produced by the solutions, since phosphates slow down the corrosion process. When the exposure time elapses, a thicker layer of possible corrosive products is generated, retarding the effects of corrosion.
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