Effect of molybdate post-sealing on the corrosion resistance of zinc phosphate coatings on hot-dip galvanized steel

Efecto de la difusión de ión cloruro en el comportamiento de acero galvanizado en estructuras de hormigón armado: Resultados preliminares

“…Los revestimientos galvanizados obtenidos por inmersión en baño de zinc fundido constituyen una barrera impermeable de zinc metálico y de aleaciones de zinc que aíslan la superficie del acero del hormigón que lo rodean. La protección obtenida por el recubrimiento de zinc se debe a un efecto barrera y galvánico, proporcionando un doble efecto protector a la armadura de acero (Zapponi, 2005;Colomban, 2008;Oh, 1998;Lin, 2008).…”

A two-step roll coating phosphate/molybdate passivation treatment for hot-dip galvanized steel sheet

“…However, hexavalent Cr is highly toxic and its use has been strictly restricted according to international regulations such as RoHS and WEEE. Non-chromate passivation treatments have, therefore, received an ever-increasing attention, including phosphate [1][2][3][4][5][6][7][8][9], cerium-based [10][11][12][13][14], silica-based [15,16], tungstate-based [17], and molybdate-based treatments [18][19][20][21][22][23][24][25][26][27][28][29][30].…”

Influence of The KF Concentration on The Coating Process And Properties of Potentiostatic Deposited Fluoride Conversion Film on AZ31 Mg Alloy

“…In general, the plots present two capacitance arcs in the high frequency region and one inductance arc in the low frequency regions. For comparing the corrosion resistance of the polarized specimens, the real impedance (Z') at which the imaginary part (Z'') vanishes from the capacitive part can be taken as the charge transfer resistance R t , and regard it as a measure of the corrosion resistance [29,[36][37] . It is estimated that R t of the polarized specimen is 660 Ωcm 2 for 0.05 M, 2600 Ωcm 2 for 0.1 M, 1830 Ωcm 2 for 0.2 M, and 1300 Ωcm 2 for 0.5 M. As compared with Figure 8, the corrosion resistance of the polarized specimen should be correlated with the thickness and chemical compositions of the films.…”