![]() ![]() ![]() Constructing a Pourbaix Diagram Book: Chem 3. Glow Discharge Optical Emission Spectroscopy was used to investigate the thickness of the U(400) sol-gel coatings as a function of the number of layers deposited with and without Rt in the coatings thickness.Constructing a Pourbaix Diagram Book. The morphological characterization of the surface was performed by Scanning Electronic Microscopy before and after exposure to SCPS. The durability and stability of the OIH coatings in SCPS was monitored during eight days by macrocell current density. The barrier performance of these OIH sol-gel coatings, named U(400), was assessed in the first instants of contact with SCPS, using electrochemical impedance spectroscopy and potentiodynamic methods. The influence of residence time (Rt), a curing step between each dip step and the number of layers of sol-gel OIH films deposited on hot-dip galvanized steel to prevent corrosion in highly alkaline environments was studied. The aim of this experimental research was to study the influence of experimental parameters using the dip-coating method on the barrier performance of an OIH sol-gel coating in contact with simulated concrete pore solutions (SCPS). However, studies on how the coating deposition method influences the barrier properties in alkaline environments are scarce. Previous studies have shown that the barrier effect and the performance of organic-inorganic hybrid (OIH) sol-gel coatings are highly dependent on the coating deposition method as well as on the processing conditions. Also, allow distinguishing different hybrid coatings with different thicknesses. This system revealed to be feasible and highly sensitive to coatings degradation. An electrochemical system to measure the macrocell current density (igal) was designed to evaluate the degradation of HDGS coated samples with different organic-inorganic hybrid films, embedded in mortar during 70 days, using an automatic data acquisition system. To evaluate the performance of these coatings, beyond the laboratory characterization, in situ tests in real conditions should be performed. Due to toxicity of Cr(VI), these kinds of pre-treatments have been forbidden and hybrid coatings have been proposed as alternatives. Although this initial corrosion process allows the formation of a protecting layer barrier, the corrosion that occurs initially is harmful and chromate conversion layers are usually used to prevent it. However, HDGS corrodes in contact with high alkaline environment of fresh concrete. The using of hot dip galvanized steel (HDGS) has been recognized as one effective measure to increase the service life of reinforced concrete structures in marine environmental. Corrosion of steel in concrete is one of the major causes of structure degradation, requiring expensive maintenance. ![]()
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