Comparison between the inhibition efficiencies of Ce(III) and Ce(IV) ammonium nitrates against corrosion of AA2024 aluminum alloy in solutions of low chloride concentration

Electrophoretic deposition of hybrid coatings on aluminum alloy by combining 3-aminopropyltrimethoxysilan to silicon–zirconium sol solutions for corrosion protection

“…However, the high hazard to human health and environment has limited the applications of chromate conversion coatings containing Cr (VI) species in industry [3][4][5][6]. Therefore, Cr(VI)-free surface treatment methods have been intensively investigated [7,8]. Silicon-zirconium (Si-Zr) organic-inorganic hybrid coatings have attracted much attention due to their remarkable properties [9].…”

Effect of Nd3+ Ion Concentration on the Corrosion Resistance of API X70 Steel in Chloride‐Rich Environments

“…e increase in pH of the cathodic sites causes the precipitation of compounds of the type Me(OH) 3 , which subsequently are transformed to more stable metal oxides (Me 2 O 3 ). e mechanism of precipitation of both rare earth oxides and hydroxides has been cited in the literature previously [7,[27][28][29][30]. In general, the hydrolysis reaction of lanthanide cations (Ln) can occur according to the following reactions:…”

Coatings for corrosion prevention based on rare earths

“…The presence of sulphate may have some 'refi ning' effect on the nodule size in the coatings. 222 Reactions that occur at the alloy surface include oxygen reduction (Eq. 7.2) as well as the reduction of water: 216 With coating solutions typically being formulated in the range of pH 5 to 6, the pH at the surface rises beyond the formulated pH resulting in the precipitation of surface hydroxides.…”