Corrosion behavior of Ce-oxide/hydroxide coated AA7075-T6 prepared by dip immersion method

Abstract

Abstract:In this study, cerium-based conversion coating was deposited on aluminum 7075-T6 by dip immersion method.Cerium oxide/hydroxide is an environmentally friendly conversion coating. Its corrosion resistance in 3.5 wt.% NaCl solution was investigated by means of electrochemical impedance spectroscopy, potentiodynamic polarization, and surface techniques. The coated samples showed a significant decrease in corrosion rate and the coating resistance increased with increasing immersion time up to 1200 s. In addition, electrochemical impedance data showed that in the presence of cerium oxide/hydroxide conversion coatings, the charge transfer resistance of aluminum increased. Surface morphology and its chemical composition were analyzed by means of scanning electron microscopy and energy dispersive spectroscopy.

Preparation and Anti-Corrosive Properties of Cerium Oxide Conversion Coatings on Steel X52

“…Cerium conversion coatings are one of the most promising environmentally friendly surface treatments for a range of metals [31][32][33] . Cerium conversion coatings have been investigated in many works for different aluminum alloys, magnesium alloys, tin, and zinc alloy 34,35 . But very limited experiments were done on steel alloys.…”