Utiliza？？o de técnicas eletroquímicas na avalia？？o da porosidade de camadas fosfatizadas

the porosity of zinc phosphate layers on low carbon steel processed in different immersion times (30 s, 45 s and 85 s) was evaluated through the following electrochemistry techniques: anodic polarization (pa), cathodic linear polarization (pcl/plc), cronoamperometry (ca), cyclic voltammetric (cv/vc), spectroscopy impedance electrochemistry (eis/eie); and also scanning electron microscopy (sem/mev). the techniques pa, cv and eis were qualitatively explored, while the pcl and ca quantitatively. the qualitative analyses (pa, cv, eis) indicated that the phosphated layers porosity increased with the decrease of the immersion time. the porosity percents values (pcl, ca) and mev images confirmed these results.