Improving the protective properties of La‐conversion coating on α‐brass surface by the combined use of La₂O₃ nanoparticles incorporation and electrodeposition

Abstract

The La 2 O 3 nanoparticles incorporation and electrodeposition were used together to prepare the La-conversion coatings on a-brass surface in a basal solution containing rare earth salt. The results showed that both techniques can improve the protective properties of coatings. A 'critical nano-La 2 O 3 content' and a 'critical deposition potential' were observed, under which the conversion coatings had the highest protective properties. Increased electrodeposition time improve the quality of conversion coatings. The La-conversion coatings could provide important protection against a-brass corrosion for considerable immersion periods in 3.5 wt% sodium chloride solution because it ennobled the corrosion potential and decreased the anodic current.