Cerium phosphate-based inhibitor for smart corrosion protection of WE43 magnesium alloy

Rare Earth Based Magnesium Alloys—A Review on WE Series

“…However, to date, very few inhibitors have been identified as effective for the protection of WE series magnesium alloys, and the protection conferred by these corrosion inhibitors has mostly been studied in non-coated systems (Argade et al, 2019;Shi et al, 2020;Yang et al, 2015). Recently, Calado et al (Calado et al, 2021) reported a newly-developed cerium organophosphate corrosion inhibitor for smart corrosion protection of WE43. The authors showed that addition of cerium tri(bis(2-ethylhexyl)phosphate) (Ce(DEHP) 3 ) to a thin epoxy-silane coating significantly improved coating barrier properties in comparison to the unmodified coating (Calado et al, 2021).…”

“…Recently, Calado et al (Calado et al, 2021) reported a newly-developed cerium organophosphate corrosion inhibitor for smart corrosion protection of WE43. The authors showed that addition of cerium tri(bis(2-ethylhexyl)phosphate) (Ce(DEHP) 3 ) to a thin epoxy-silane coating significantly improved coating barrier properties in comparison to the unmodified coating (Calado et al, 2021). In addition, Ce(DEHP) 3 displayed a cyclic protective behaviour, as illustrated in Figure 3 (Calado et al, 2021).…”

Preparation and electrochemical inhibition properties of Ce3+-photomodified zinc phosphate materials

“…The CPE is related to interfacial processes between the iron substrate surface and the coating. 22 These interfacial processes include the formation of corrosion products and/or surface oxides/hydroxides on the iron substrate. The conductivity of the CPE of the ZP coating (Fig.…”

“…This compound is very stable (Ksp Ce(OH) 3 = 6.3 Â 10 À24 at 25 1C 49 ) and precipitates at the cathodic site, thus protecting the cathodic site and stopping the anodic reaction. 22,50 To investigate the mechanism of the corrosion inhibition effect of CeP, an artificial defect of 0.5 cm was created 2 cm above the coating, submerged in a solution of 3.5 wt% NaCl and subjected to EIS. Fig.…”

“…[18][19][20] Cerium has been more widely reported as a corrosion inhibitor and is very effective in the protection of magnesium-aluminum alloys. [21][22][23] This is attributed to its ability to produce stable cerium oxide and cerium hydroxide that blocks the cathodic reaction site, thereby reducing the corrosion reaction rate. 24,25 The combined action of cerium and organophosphates has been proposed, and tris(bis(2-ethylhexyl)) cerium phosphate, 26 dibutyl cerium a Key Laboratory for Advanced Materials, School of Chemistry and Molecular phosphate, 27 and dibutyl cerium phosphate 28 have been shown to have significant effects in inhibiting corrosion of aluminum alloys.…”