Formation of a cerium conversion coating on magnesium alloy using ascorbic acid as additive. Characterisation and anticorrosive properties of the formed films

Active corrosion protection by a smart coating based on a MgAl-layered double hydroxide on a cerium-modified plasma electrolytic oxidation coating on Mg alloy AZ31

“…This clearly shows that the presence of two valence states for cerium in Ce 3d core level ( Fig. 3a): Ce (III) and Ce (IV), which was consistent with the literature [36]. The binding energy (B. E.) of the peaks are listed in Table 1.…”

Formation Process of an LDHs Coating on Magnesium Alloy by a CO2 Pressurization Method

“…Although chromate chemical conversion treatment has a high-performing corrosion resistance for magnesium alloys, hexavalent chromium (Cr 6+ ) has been gradually banned, since it is toxic and harmful for the environment; hence the development of new ways towards chromium-free chemical conversion treatments [20][21][22]. Chromium-free acid salt treatment includes: phosphate conversion coating [23,24], phosphate-permanganate conversion coating [25][26][27], stannate conversion coating [28,29], vanadate conversion coating [30,31], cerium conversion coating [32,33], lanthanide conversion coating [34], hydrotalcite surface coating, and so forth [35,36]. Hydrotalcite coating has attracted much attention, due to its unique intercalation structure and its environmentally friendly properties [37][38][39][40][41][42][43][44][45][46][47][48][49][50].…”

Investigation on the composition and corrosion resistance of cerium-based conversion treatment by alkaline methods on aluminum alloy 6063

“…7 Therefore, considerable effort has been devoted to developing viable alternatives to chromate, including permanganate, 8 phosphate, 9 titanate/zirconate, 10 molybdate, 7 and rare earth salts. [11][12][13][14][15] Extensive researches have shown that rare earth metal (REM) salts are effective inhibitors for corrosion protection of aluminum alloys, 12,[15][16][17] zinc, 18 magnesium, 11,14,19 steel, 20 and metal matrix composites. 13,21,22 Due to the non-toxicity and acceptable anticorrosive property of REM salts, 23 rare earth conversion treatment of aluminum alloys is considered to be one of the most promising substitutes for chromate conversion treatment.…”

“…13,21,22 Due to the non-toxicity and acceptable anticorrosive property of REM salts, 23 rare earth conversion treatment of aluminum alloys is considered to be one of the most promising substitutes for chromate conversion treatment. 11,15,17,19 In addition, most studies imply that cerium salts show better corrosion protection than other REM salts. 24,25 K. A. Yasakau et al 26,27 synthesized amorphous cerium molybdate nanowires, which was used alone or as corrosion inhibitor in sol-gel coatings for protection of 2024 aluminum alloy, and the mechanism of active protection was based on the high solubility of cerium molybdate nanomaterials.…”