Abstract

SANTOS, Célia A. Lino dos; LEITE, Edwilson; FILHO, Antenor Ferreira  and  PANOSSIAN, Zehbour. Use of electrochemical techniques in porosity phosphate coatings evaluation . Corros. Prot. Mater. [online]. 2006, vol.25, n.4, pp.114-115. ISSN 0870-1164.

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 (P_A), cathodic linear polarization (P_CL/P_LC), cronoamperometry (C_A), cyclic voltammetric (CV/VC), spectroscopy impedance electrochemistry (EIS/EIE); and also scanning electron microscopy (SEM/MEV). The techniques P_A, CV and EIS were qualitatively explored, while the P_CL and C_A quantitatively. The qualitative analyses (P_A, CV, EIS) indicated that the phosphated layers porosity increased with the decrease of the immersion time. The porosity percents values (P_CL, C_A) and MEV images confirmed these results.

Keywords : Zinc Phosphate; Porosity; Electrochemistry Techniques.

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